Practical Exercises in Elementary Meteorology Part 13

======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+====== _t._ 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0 6.2 6.4 _t._ ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 8 8 9 9 10 -57 10 11 -41 -60 11 12 -31 -41 -59 12 13 -25 -31 -40 -58 13 14 -20 -25 -30 -39 -56 14 15 -16 -20 -24 -30 -38 -53 15 16 -13 -16 -19 -23 -28 -36 -50 16 17 -10 -12 -15 -18 -22 -27 -34 -47 17 18 -7 -9 -12 -14 -17 -21 -26 -32 -44 18 19 -5 -7 -9 -11 -14 -17 -20 -25 -30 -40 19 20 -2 -4 -6 -8 -10 -13 -16 -19 -23 -29 20 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0 6.2 6.4 _t_.

TABLE I.--TEMPERATURE OF THE DEW-POINT, IN DEGREES FAHRENHEIT.

======+===========================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +----+----+----+----+----+----+----+----+----+----+----+----+(Dry ther.) 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 ther.) ------+----+----+----+----+----+----+----+----+----+----+----+----+------ 20 18 17 15 13 10 8 5 2 -2 -6 -12 -19 20 21 19 18 16 14 12 9 7 4 0 -4 -8 -15 21 22 20 19 17 15 13 11 8 6 +2 -1 -6 -11 22 23 22 20 18 16 14 12 10 7 4 +1 -3 -8 23 24 23 21 19 18 16 14 11 9 6 3 -1 -5 24 25 24 22 21 19 17 15 13 11 8 5 +2 -2 25 26 25 23 22 20 18 16 14 12 10 7 4 0 26 27 26 24 23 21 20 18 16 14 11 9 6 +3 27 28 27 25 24 22 21 19 17 15 13 11 8 5 28 29 28 26 25 24 22 20 19 17 14 12 10 7 29 30 29 27 26 25 23 22 20 18 16 14 11 9 30 31 30 29 27 26 24 23 21 19 18 15 13 11 31 32 31 30 28 27 26 24 22 21 19 17 15 13 32 33 31 31 29 28 26 25 23 22 19 18 16 14 33 34 32 32 30 29 27 26 24 24 21 20 18 16 34 35 33 32 31 30 29 28 26 25 23 22 20 18 35 36 35 34 32 31 30 29 27 26 24 23 21 19 36 37 36 35 33 32 31 30 28 27 26 24 22 21 37 38 37 36 34 33 32 31 30 28 27 26 24 22 38 39 38 37 35 34 33 32 30 29 28 27 25 24 39 40 39 38 36 35 34 33 31 30 29 28 26 25 40 41 40 39 37 36 35 34 32 32 30 29 28 26 41 42 41 40 39 38 36 35 34 33 31 30 29 27 42 43 42 41 40 39 37 36 35 34 32 31 30 29 43 44 43 42 41 40 38 37 36 35 33 32 31 30 44 45 44 43 42 41 40 39 37 36 34 33 32 31 45 46 45 44 43 42 41 40 38 37 36 35 33 32 46 47 46 45 44 43 42 41 40 39 37 36 34 33 47 48 47 46 45 44 43 42 41 40 38 37 36 35 48 49 48 47 46 45 44 43 42 41 39 38 37 36 49 50 49 48 47 46 45 44 43 42 41 40 38 37 50 51 50 49 48 47 46 45 44 43 42 41 39 38 51 52 51 50 49 48 47 46 45 44 43 42 41 40 52 53 52 51 50 49 48 47 46 45 44 43 42 41 53 54 53 52 51 50 50 49 47 46 45 44 43 42 54 55 54 53 53 52 51 50 49 48 47 46 44 43 55 56 55 54 54 53 52 51 50 49 48 47 45 44 56 57 56 55 55 54 53 52 51 50 49 48 47 46 57 58 57 56 56 55 54 53 52 51 50 49 48 47 58 59 58 57 57 56 55 54 53 52 51 50 49 48 59 60 59 58 58 57 56 55 54 53 52 51 50 49 60 61 60 59 59 58 57 56 55 54 53 52 51 50 61 62 61 60 60 59 58 57 56 55 54 53 52 52 62 63 62 61 61 60 59 58 57 56 55 55 54 53 63 64 63 62 62 61 60 59 58 57 56 56 55 54 64 65 64 63 63 62 61 60 59 59 58 57 56 55 65 66 65 64 64 63 62 61 60 60 59 58 57 56 66 67 67 66 65 64 63 62 61 61 60 59 58 57 67 68 68 67 66 65 64 63 62 62 61 60 59 58 68 69 69 68 67 66 65 64 63 63 62 61 60 59 69 70 70 69 68 67 67 66 65 64 63 62 61 61 70 71 71 70 69 68 68 67 66 65 64 63 62 62 71 72 72 71 70 69 69 68 67 66 65 64 63 63 72 73 73 72 71 70 70 69 68 67 66 66 65 64 73 74 74 73 72 71 71 70 69 68 67 67 66 65 74 75 75 74 73 72 72 71 70 69 68 68 67 66 75 76 76 75 74 73 73 72 71 70 69 69 68 67 76 77 77 76 75 74 74 73 72 71 70 70 69 68 77 78 78 77 76 75 75 74 73 72 71 71 70 69 78 79 79 78 77 76 76 75 74 73 72 72 71 70 79 80 80 79 78 77 77 76 75 74 73 73 72 72 80 ------+----+----+----+----+----+----+----+----+----+----+----+----+------ _t._ 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 _t._ ======+====+====+====+====+====+====+====+====+====+====+====+====+======

TABLE I.--TEMPERATURE OF THE DEW-POINT, IN DEGREES FAHRENHEIT.

======+=============================================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ (Dry ther.) 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 19 -25 19 20 -19 -32 20 21 -15 -24 -47 21 22 -11 -19 -31 22 23 -8 -14 -24 -45 23 24 -5 -10 -18 -30 24 25 -2 -7 -13 -22 -42 25 26 0 -4 -9 -17 -28 26 27 +3 -1 -6 -12 -20 -37 27 28 5 +1 -3 -8 -15 -25 -54 28 29 7 4 0 -4 -10 -18 -32 29 30 9 6 +2 -2 -6 -13 -22 -43 30 31 11 8 5 +1 -3 -8 -15 -27 31 32 13 10 7 4 0 -4 -10 -18 -33 32 33 14 12 9 6 +3 -1 -6 -12 -22 -44 33 34 16 14 11 8 6 +2 -2 -8 -15 -27 34 35 18 15 13 10 8 5 +1 -4 -9 -18 -32 35 36 19 17 15 12 10 8 4 0 -5 -12 -20 -42 36 37 21 19 17 14 12 9 6 +3 -2 -6 -14 -25 -52 37 38 22 20 19 16 14 11 9 6 +2 -2 -8 -16 -29 38 39 24 22 20 18 16 14 11 8 5 +1 -4 -10 -18 39 40 25 23 22 20 18 16 13 11 8 4 0 -5 -12 40 41 26 25 23 21 20 17 15 13 10 7 +4 -1 -6 41 42 27 26 24 23 21 19 18 15 12 10 7 +3 -2 42 43 29 27 26 24 23 21 19 17 14 12 9 6 +2 43 44 30 28 27 26 24 22 20 18 16 14 12 9 6 44 45 31 30 28 27 25 24 22 20 18 16 13 11 8 45 46 32 31 30 28 27 25 24 22 20 18 16 13 11 46 47 33 32 31 29 28 26 25 23 22 20 18 15 13 47 48 35 33 32 30 29 28 26 25 23 21 20 17 15 48 49 36 34 33 32 31 29 28 26 25 23 21 19 17 49 50 37 35 34 33 32 31 29 28 26 24 23 21 19 50 51 38 37 36 34 33 32 31 29 28 26 24 22 21 51 52 40 38 37 36 34 33 32 30 29 28 26 24 23 52 53 41 39 38 37 36 34 33 32 30 29 28 26 24 53 54 42 41 40 39 37 36 34 33 32 30 29 27 26 54 55 43 42 41 40 39 37 36 34 33 32 30 29 28 55 56 44 43 42 41 40 39 37 36 34 33 32 30 29 56 57 46 45 44 42 41 40 39 37 36 35 33 32 30 57 58 47 46 45 44 42 41 40 39 37 36 35 33 32 58 59 48 47 46 45 44 43 41 40 39 38 36 35 33 59 60 49 48 47 46 45 44 43 41 40 39 38 36 35 60 61 50 49 48 47 46 45 44 43 42 41 39 38 36 61 62 52 51 50 49 48 47 45 44 43 42 41 39 38 62 63 53 52 51 50 49 48 47 45 44 43 42 41 39 63 64 54 53 52 51 50 49 48 47 46 45 43 42 41 64 65 55 54 53 52 51 50 49 48 47 46 45 43 42 65 66 56 55 54 53 52 51 50 49 48 47 46 45 44 66 67 57 56 55 55 54 53 52 51 50 48 47 46 45 67 68 58 57 57 56 55 54 53 52 51 50 49 47 46 68 69 59 58 58 57 56 55 54 53 52 51 50 49 48 69 70 61 60 59 58 57 56 55 54 53 52 51 50 49 70 71 62 61 60 59 58 57 56 55 55 54 53 52 51 71 72 63 62 61 60 59 59 58 57 56 55 54 53 52 72 73 64 63 62 62 61 60 59 58 57 56 55 54 53 73 74 65 64 63 63 62 61 60 59 58 57 56 55 54 74 75 66 65 64 64 63 62 61 60 59 58 57 56 56 75 76 67 66 65 65 64 63 62 61 61 60 59 58 57 76 77 68 67 67 66 65 64 63 62 62 61 60 59 58 77 78 69 68 68 67 66 66 65 64 63 62 61 60 59 78 79 70 69 69 68 67 67 66 65 64 63 62 61 61 79 80 72 71 70 69 68 68 67 66 65 64 63 62 62 80 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 _t._ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

TABLE I.--TEMPERATURE OF THE DEW-POINT, IN DEGREES FAHRENHEIT.

======+=============================================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(Dry ther.) 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 40 -12 -22 -44 40 41 -6 -13 -25 41 42 -2 -7 -15 -28 42 43 +2 -3 -8 -17 -33 43 44 6 +1 -4 -10 -19 -40 44 45 8 5 0 -4 -11 -22 -48 45 46 11 8 +4 0 -5 -13 -24 46 47 13 10 7 +3 -1 -6 -14 -27 47 48 15 12 10 6 +2 -2 -8 -16 -30 48 49 17 14 12 9 6 +2 -3 -9 -18 -35 49 50 19 16 14 12 9 5 +1 -4 -10 -20 -42 50 51 21 18 17 14 11 8 5 0 -5 -12 -22 -52 51 52 23 21 19 16 14 11 8 +4 0 -6 -13 -25 52 53 24 22 20 18 16 14 11 8 +4 -1 -6 -14 -28 53 54 26 24 22 20 18 16 13 10 7 +3 -2 -8 -16 54 55 28 26 24 22 20 18 16 13 10 7 +3 -2 -8 55 56 29 27 26 24 22 20 18 15 13 10 6 +2 -2 56 57 30 29 28 26 24 22 20 18 15 13 10 6 +2 57 58 32 30 29 27 26 24 22 20 18 15 12 9 6 58 59 33 32 31 29 27 26 24 22 20 18 15 12 9 59 60 35 33 32 30 29 27 26 24 22 20 18 15 12 60 61 36 35 33 32 31 29 28 26 24 22 20 18 15 61 62 38 37 35 34 32 31 29 28 26 24 22 20 18 62 63 39 38 37 35 34 32 31 29 28 26 24 22 20 63 64 41 39 38 37 35 34 32 31 29 28 26 24 22 64 65 42 41 40 38 37 35 34 32 31 29 28 26 24 65 66 44 43 41 40 38 37 35 34 32 31 30 28 26 66 67 45 44 43 41 40 39 37 36 34 32 31 30 28 67 68 46 45 44 43 42 40 39 38 36 34 33 31 30 68 69 48 47 46 45 43 42 40 39 38 36 34 33 32 69 70 49 48 47 46 45 43 42 41 39 38 36 35 33 70 71 51 49 48 47 46 45 43 42 41 39 38 36 35 71 72 52 51 50 49 47 46 45 44 43 41 40 38 37 72 73 53 52 51 50 49 48 46 45 44 43 41 40 38 73 74 54 53 52 51 50 49 48 47 45 44 43 41 40 74 75 56 55 54 53 52 50 49 48 47 45 44 43 42 75 76 57 56 55 54 53 52 50 49 48 47 46 45 43 76 77 58 57 56 55 54 53 52 51 50 49 48 46 45 77 78 59 58 57 56 55 54 53 52 51 50 49 48 47 78 79 61 60 59 58 57 56 55 54 53 52 51 49 48 79 80 62 61 60 59 58 57 56 55 54 53 52 51 50 80 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 _t._ ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------

TABLE I.--TEMPERATURE OF THE DEW-POINT, IN DEGREES FAHRENHEIT.

======+=============================================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(Dry ther.) 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0 ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 55 -8 55 56 -2 -19 56 57 +2 -10 -48 57 58 6 -3 -22 58 59 9 +1 -12 59 60 12 5 -5 -25 60 61 15 9 0 -14 61 62 18 12 +5 -6 -28 62 63 20 15 9 0 -14 63 64 22 18 12 +4 -6 -32 64 65 24 20 15 9 0 -16 65 66 26 22 18 12 +4 -7 -34 66 67 28 24 20 15 9 -1 -16 67 68 30 26 23 18 12 +4 -7 -37 68 69 32 28 25 20 15 8 0 -17 69 70 33 30 27 23 19 12 +5 -7 -39 70 71 35 32 29 25 21 16 9 0 -17 71 72 37 33 31 27 23 18 13 +5 -6 -39 72 73 38 35 32 29 25 21 16 10 0 -16 73 74 40 37 34 31 28 24 19 13 +6 -6 -37 74 75 42 39 36 32 30 26 22 16 10 0 -16 75 76 43 41 38 34 32 28 24 20 14 +6 -6 -34 76 77 45 42 40 36 33 30 26 22 17 11 +1 -14 77 78 47 44 41 38 35 32 28 24 20 14 7 -4 -30 78 79 48 46 43 40 37 34 31 27 23 18 11 +2 -13 79 80 50 47 45 42 39 36 32 29 25 21 15 8 -3 80 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t_ 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0 _t_ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

TABLE I.--TEMPERATURE OF THE DEW-POINT, IN DEGREES FAHRENHEIT.

======+==============================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +----+----+----+----+----+----+----+----+----+-----+-----+-----+(Dry ther.) 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 ther.) ------+----+----+----+----+----+----+----+----+----+-----+-----+-----+------ 80 79 77 76 74 73 72 70 68 67 65 63 62 80 81 80 78 77 75 74 73 71 70 68 66 65 63 81 82 81 79 78 77 75 74 72 71 69 68 66 64 82 83 82 80 79 78 76 75 73 72 70 69 67 65 83 84 83 81 80 79 77 76 74 73 71 70 68 67 84 85 84 82 81 80 78 77 75 74 72 71 69 68 85 86 85 83 82 81 79 78 76 75 73 72 71 69 86 87 86 84 83 82 80 79 78 76 74 73 72 70 87 88 87 85 84 83 81 80 79 77 75 74 73 71 88 89 88 86 85 84 82 81 80 78 76 76 74 72 89 90 89 87 86 85 84 82 81 79 78 77 75 74 90 91 90 88 87 86 85 83 82 80 79 78 76 75 91 92 91 89 88 87 86 84 83 82 80 79 77 76 92 93 92 91 89 88 87 85 84 83 81 80 78 77 93 94 93 92 90 89 88 86 85 84 82 81 80 78 94 95 94 93 91 90 89 87 86 85 83 82 81 79 95 96 95 94 92 91 90 88 87 86 84 83 82 80 96 97 96 95 93 92 91 90 88 87 86 84 83 81 97 98 97 96 94 93 92 91 89 88 87 85 84 83 98 99 98 97 95 94 93 92 90 89 88 86 85 84 99 100 99 98 96 95 94 93 91 90 89 87 86 85 100 101 100 99 97 96 95 94 92 91 90 88 87 86 101 102 101 100 98 97 96 95 93 92 91 90 88 87 102 103 102 101 99 98 97 96 94 93 92 91 89 88 103 104 103 102 100 99 98 97 96 94 93 92 90 89 104 105 104 103 101 100 99 98 97 95 94 93 91 90 105 106 105 104 102 101 100 99 98 96 95 94 93 91 106 107 106 105 103 102 101 100 99 97 96 95 94 92 107 108 107 106 104 103 102 101 100 98 97 96 95 93 108 109 108 107 105 104 103 102 101 99 98 97 96 94 109 110 109 108 107 105 104 103 102 101 99 98 97 96 110 ------+----+----+----+----+----+----+----+----+----+-----+-----+-----+------ _t._ 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 _t._ ======+====+====+====+====+====+====+====+====+====+=====+=====+=====+======

TABLE I.--TEMPERATURE OF THE DEW-POINT, IN DEGREES FAHRENHEIT.

======+=============================================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(Dry ther.) 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 80 62 60 58 56 54 52 50 47 45 42 39 36 32 80 81 63 61 59 57 55 53 51 49 47 44 41 38 35 81 82 64 62 61 59 57 55 53 50 48 45 43 40 37 82 83 65 64 62 60 58 56 54 52 50 47 44 42 39 83 84 67 65 63 61 59 57 55 53 51 49 46 43 41 84 85 68 66 64 62 61 59 57 55 53 50 48 45 42 85 86 69 67 66 64 62 60 58 56 54 52 49 47 44 86 87 70 68 67 65 63 61 59 57 55 53 51 48 46 87 88 71 70 68 66 64 63 61 59 57 55 53 50 48 88 89 72 71 69 67 66 64 62 60 58 56 54 52 49 89 90 74 72 70 69 67 65 63 62 60 58 56 53 51 90 91 75 73 72 70 68 67 65 63 61 59 57 55 53 91 92 76 74 73 71 69 68 66 64 62 60 58 56 54 92 93 77 75 74 72 71 69 67 66 64 62 60 58 56 93 94 78 77 75 73 72 70 69 67 65 63 61 59 57 94 95 79 78 76 75 73 71 70 68 66 64 63 61 59 95 96 80 79 77 76 74 73 71 69 68 66 64 62 60 96 97 81 80 78 77 75 74 72 71 69 67 65 63 61 97 98 83 81 80 78 77 75 73 72 70 68 67 65 63 98 99 84 82 81 79 78 76 75 73 71 70 68 66 64 99 100 85 83 82 80 79 77 76 74 73 71 69 67 66 100 101 86 84 83 82 80 79 77 75 74 72 71 69 67 101 102 87 85 84 83 81 80 78 77 75 73 72 70 68 102 103 88 87 85 84 82 81 79 78 76 75 73 71 70 103 104 89 88 86 85 83 82 81 79 78 76 74 73 71 104 105 90 89 87 86 85 83 82 80 79 77 76 74 72 105 106 91 90 89 87 86 84 83 81 80 78 77 75 74 106 107 92 91 90 88 87 85 84 83 81 80 78 76 75 107 108 93 92 91 89 88 87 85 84 82 81 79 78 76 108 109 94 93 92 90 89 88 86 85 83 82 80 79 77 109 110 96 94 93 92 90 89 87 86 85 83 82 80 79 110 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 _t._ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

TABLE I.--TEMPERATURE OF THE DEW-POINT, IN DEGREES FAHRENHEIT.

======+=============================================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(Dry ther.) 24.0 25.0 26.0 27.0 28.0 29.0 30.0 31.0 32.0 33.0 34.0 35.0 36.0 ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 80 32 29 25 21 15 8 -3 -27 80 81 35 31 28 24 18 12 +3 -11 81 82 37 33 30 26 22 16 9 -2 -24 82 83 39 35 32 28 24 19 13 +5 -9 83 84 41 37 34 30 27 22 17 10 0 -20 84 85 42 39 36 32 29 25 20 14 +6 -7 -54 85 86 44 41 38 35 31 28 23 18 11 +1 -17 86 87 46 43 40 37 33 30 26 21 15 7 -5 -38 87 88 48 45 42 39 35 32 28 24 19 12 +3 -13 88 89 49 47 44 41 38 34 31 27 22 16 9 -2 -28 89 90 51 48 46 43 40 36 32 29 25 20 13 +4 -10 90 91 53 50 47 45 42 38 35 32 28 23 18 10 0 91 92 54 52 49 46 44 41 37 34 30 26 21 15 +7 92 93 56 53 51 48 46 43 39 36 32 29 24 19 12 93 94 57 55 53 50 47 45 42 38 35 31 27 22 16 94 95 59 56 54 52 49 46 44 40 37 33 30 25 20 95 96 60 58 56 53 51 48 46 43 39 36 32 28 24 96 97 61 59 57 55 53 50 47 45 41 38 34 31 26 97 98 63 61 59 57 54 52 49 47 44 40 37 33 29 98 99 64 62 60 58 56 54 51 48 46 43 39 35 32 99 100 66 64 62 60 57 55 53 50 48 45 41 38 34 100 101 67 65 63 61 59 57 54 52 49 47 44 40 37 101 102 68 66 65 63 61 58 56 54 51 49 46 43 39 102 103 70 68 66 64 62 60 58 55 53 50 48 45 41 103 104 71 69 67 65 63 61 59 57 55 52 50 47 44 104 105 72 70 69 67 65 63 61 59 56 54 52 49 46 105 106 74 72 70 68 66 64 62 60 58 56 53 51 48 106 107 75 73 71 70 68 66 64 62 60 57 55 52 50 107 108 76 74 73 71 69 67 65 63 61 59 57 54 52 108 109 77 76 74 72 71 69 67 65 63 61 58 56 54 109 110 79 77 75 74 72 70 68 66 64 62 60 58 55 110 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 24.0 25.0 26.0 27.0 28.0 29.0 30.0 31.0 32.0 33.0 34.0 35.0 36.0 _t._ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

TABLE I.--TEMPERATURE OF THE DEW-POINT, IN DEGREES FAHRENHEIT.

======+=============================================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(Dry ther.) 36.0 37.0 38.0 39.0 40.0 41.0 42.0 43.0 44.0 45.0 46.0 47.0 48.0 ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 89 -28 89 90 -10 90 91 0 -22 91 92 +7 -7 -16 92 93 12 +2 -4 93 94 16 8 +4 -37 94 95 20 13 10 -12 95 96 24 15 15 -1 -25 96 97 26 21 19 +7 -8 97 98 29 25 23 12 +2 -18 98 99 32 28 26 17 9 -4 -42 99 100 34 30 29 21 14 +5 -12 100 101 37 32 32 24 18 11 0 -25 101 102 39 35 34 27 22 16 +7 -7 102 103 41 38 34 30 26 20 13 +3 -16 103 104 44 40 37 32 29 24 18 10 -2 -38 104 105 46 43 39 35 31 27 22 15 +6 -10 105 106 48 45 42 38 34 30 25 20 12 +1 -22 106 107 50 47 44 40 37 32 28 24 17 9 -5 107 108 52 49 46 43 39 35 31 27 21 14 +5 -13 108 109 54 51 48 45 42 38 34 30 25 19 12 0 -28 109 110 55 53 50 47 44 41 37 33 28 23 17 +8 -7 110 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 36.0 37.0 38.0 39.0 40.0 41.0 42.0 43.0 44.0 45.0 46.0 47.0 48.0 _t._ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

TABLE II.--RELATIVE HUMIDITY, PER CENT.

======+================================================================+======= _t_ Difference between the dry and wet thermometers (_t_--_t'_). _t_ (Dry +----+----+----+----+----+----+----+----+----+----+----+----+----+ (Dry ther.) 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 ther.) ------+----+----+----+----+----+----+----+----+----+----+----+----+----+------- -40 46 -40 -39 49 -39 -38 51 -38 -37 54 -37 -36 56 -36 -35 59 -35 -34 61 22 -34 -33 63 25 -33 -32 65 30 -32 -31 67 34 -31 -30 69 38 -30 -29 71 42 -29 -28 72 45 17 -28 -27 74 48 22 -27 -26 76 51 26 -26 -25 77 53 31 -25 -24 78 56 34 12 -24 -23 79 58 37 16 -23 -22 80 60 40 20 -22 -21 81 62 44 25 -21 -20 82 64 47 29 11 -20 -19 83 66 49 33 16 -19 -18 84 68 52 36 20 -18 -17 85 70 54 39 24 9 -17 -16 86 71 57 43 28 14 -16 -15 86 73 59 46 32 19 -15 -14 87 74 61 48 36 23 10 -14 -13 88 76 63 51 39 27 15 -13 -12 88 77 65 53 42 30 19 7 -12 -11 89 78 67 56 45 34 23 12 -11 -10 90 79 68 58 48 37 26 16 5 -10 -9 90 80 70 60 50 40 30 20 10 -9 -8 90 81 71 62 52 43 33 24 14 5 -8 -7 91 82 73 63 54 45 36 27 18 9 -7 -6 91 83 74 65 56 48 39 31 22 13 5 -6 -5 92 83 75 67 58 50 42 34 25 17 9 -5 -4 92 84 76 68 60 52 45 37 29 21 13 5 -4 -3 92 85 77 70 62 55 47 40 32 25 17 10 -3 -2 93 86 78 71 64 57 50 42 35 28 21 14 7 -2 -1 93 86 79 72 66 59 52 45 38 31 25 18 11 -1 0 93 87 80 74 67 61 54 48 41 35 28 22 15 0 +1 94 87 81 75 69 63 56 50 44 38 32 25 19 +1 2 94 88 82 76 70 64 58 52 46 40 35 29 23 2 3 94 88 83 77 71 66 60 54 49 43 37 32 26 3 4 94 89 83 78 73 67 62 56 51 45 40 34 29 4 5 95 89 84 79 74 68 63 58 53 48 42 37 32 5 6 95 90 85 80 75 70 65 60 54 50 44 39 34 6 7 95 90 85 80 76 71 66 61 56 51 47 42 37 7 8 95 91 86 81 76 72 67 62 58 53 49 44 39 8 9 96 91 86 82 77 73 68 64 59 55 51 46 42 9 10 96 91 87 83 78 74 69 65 61 57 52 48 44 10 11 96 92 87 83 79 75 71 66 62 58 54 50 46 11 12 96 92 88 84 80 76 72 68 64 60 56 52 48 12 13 96 92 88 84 81 77 73 69 65 61 58 54 50 13 14 96 93 89 85 81 78 74 70 67 63 59 56 52 14 15 96 93 89 86 82 79 75 71 68 64 61 57 54 15 16 97 93 90 86 83 79 76 73 69 66 62 59 56 16 17 97 93 90 87 83 80 77 74 70 67 64 60 57 17 18 97 94 90 87 84 81 78 74 71 68 65 62 59 18 19 97 94 91 88 84 81 78 75 72 69 66 63 60 19 20 97 94 91 88 85 82 79 76 73 70 67 64 61 20 ------+----+----+----+----+----+----+----+----+----+----+----+----+----+------- _t._ 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 _t._ ======+====+====+====+====+====+====+====+====+====+====+====+====+====+=======

TABLE II.--RELATIVE HUMIDITY, PER CENT.

======+===========================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(Dry ther.) 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ -2 7 -2 -1 11 4 -1 0 15 9 0 +1 19 13 7 +1 2 23 17 11 5 2 3 26 20 15 9 4 3 4 29 24 18 13 8 2 4 5 32 27 22 16 11 6 5 6 34 29 25 20 15 10 5 6 7 37 32 28 23 18 13 9 4 7 8 39 35 30 26 21 17 12 8 3 8 9 42 37 33 28 24 20 15 11 7 2 9 10 44 40 35 31 27 23 19 14 10 6 10 11 46 42 38 34 30 26 22 18 14 10 11 12 48 44 40 36 32 28 25 21 17 13 12 13 50 46 42 39 35 31 27 24 20 16 13 14 52 48 45 41 37 34 30 27 23 19 14 15 54 50 47 43 40 36 33 29 26 23 15 16 56 52 49 46 42 39 36 32 29 25 16 17 57 54 51 48 44 41 38 35 31 28 17 18 59 56 53 49 46 43 40 37 34 31 18 19 60 57 54 51 48 45 42 39 36 33 19 20 61 58 56 53 50 47 44 41 38 35 20 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 _t._ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+====== _t._ 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0 6.2 6.4 _t._ ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 8 8 9 9 10 2 10 11 6 2 11 12 9 5 2 12 13 13 9 5 2 13 14 16 12 9 5 2 14 15 19 16 12 9 5 2 15 16 22 19 16 12 9 6 2 16 17 25 22 19 16 12 9 6 3 17 18 28 25 22 19 16 13 9 6 3 18 19 30 27 24 21 19 16 13 10 7 4 19 20 33 30 27 24 21 19 16 13 10 7 20 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0 6.2 6.4 _t._ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

TABLE II.--RELATIVE HUMIDITY, PER CENT.

======+=======================================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(Dry ther.) 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 20 92 85 77 70 63 56 48 41 34 27 20 13 20 21 93 85 78 71 64 57 50 43 36 29 23 16 21 22 93 86 79 72 65 58 51 45 38 32 25 19 22 23 93 86 80 73 66 60 53 46 40 34 27 21 23 24 93 87 80 74 67 61 54 48 42 36 30 24 24 25 94 87 81 74 68 62 56 50 44 38 32 26 25 26 94 88 81 75 69 63 57 51 45 40 34 28 26 27 94 88 82 76 70 64 59 53 47 42 36 30 27 28 94 88 82 77 71 65 60 54 49 43 38 33 28 29 94 89 83 77 72 66 61 56 50 45 40 35 29 30 94 89 84 78 73 67 62 57 52 47 41 36 30 31 95 89 84 79 74 68 63 58 53 48 43 38 31 32 95 90 84 79 74 69 64 59 54 50 45 40 32 33 95 90 85 80 75 70 65 60 56 51 47 42 33 34 95 91 86 81 75 72 67 62 57 53 48 44 34 35 95 91 86 82 76 73 69 65 59 54 50 45 35 36 96 91 86 82 77 73 70 66 61 56 51 47 36 37 96 91 87 82 78 74 70 66 62 57 52 48 37 38 96 92 87 83 79 75 71 67 63 58 54 50 38 39 96 92 88 83 79 75 72 68 63 59 55 52 39 40 96 92 88 84 80 76 72 68 64 60 56 53 40 41 96 92 88 84 80 76 72 69 65 61 57 54 41 42 96 92 88 84 81 77 73 69 65 62 58 55 42 43 96 92 88 85 81 77 74 70 66 63 59 56 43 44 96 92 88 85 81 78 74 70 67 63 60 57 44 45 96 92 89 85 82 78 75 71 67 64 61 58 45 46 96 93 89 85 82 79 75 72 68 65 61 58 46 47 96 93 89 86 83 79 76 72 69 66 62 59 47 48 96 93 89 86 83 79 76 73 69 66 63 60 48 49 97 93 90 86 83 80 76 73 70 67 63 60 49 50 97 93 90 87 83 80 77 74 70 67 64 61 50 51 97 93 90 87 84 81 77 74 71 68 65 62 51 52 97 94 90 87 84 81 78 75 72 69 66 63 52 53 97 94 91 87 84 81 78 75 72 69 66 63 53 54 97 94 91 88 85 82 79 76 73 70 67 64 54 55 97 94 91 88 85 82 79 76 73 70 68 65 55 56 97 94 91 88 85 82 80 77 74 71 68 65 56 57 97 94 91 88 86 83 80 77 74 71 69 66 57 58 97 94 91 89 86 83 80 78 75 72 69 67 58 59 97 94 92 89 86 83 81 78 75 72 70 67 59 60 97 94 92 89 86 84 81 78 75 73 70 68 60 61 97 94 92 89 87 84 81 78 76 73 71 68 61 62 97 95 92 89 87 84 81 79 76 74 71 69 62 63 97 95 92 89 87 84 82 79 77 74 72 69 63 64 97 95 92 90 87 85 82 79 77 74 72 70 64 65 97 95 92 90 87 85 82 80 77 75 72 70 65 66 97 95 92 90 87 85 82 80 78 75 73 71 66 67 98 95 93 90 88 85 83 80 78 76 73 71 67 68 98 95 93 90 88 85 83 81 78 76 74 71 68 69 98 95 93 90 88 86 83 81 78 76 74 72 69 70 98 95 93 90 88 86 83 81 79 77 74 72 70 71 98 95 93 91 88 86 84 81 79 77 75 72 71 72 98 95 93 91 88 86 84 82 79 77 75 73 72 73 98 95 93 91 88 86 84 82 80 78 75 73 73 74 98 95 93 91 88 86 84 82 80 78 76 74 74 75 98 95 93 91 89 87 84 82 80 78 76 74 75 76 98 95 93 91 89 87 85 82 80 78 76 74 76 77 98 95 93 91 89 87 85 83 80 78 76 74 77 78 98 96 93 91 89 87 85 83 81 79 77 75 78 79 98 96 94 91 89 87 85 83 81 79 77 75 79 80 98 96 94 92 89 87 85 83 81 79 77 75 80 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 _t._ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

TABLE II.--RELATIVE HUMIDITY, PER CENT.

======+=====================================================================+===== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +----+----+----+----+----+----+----+----+-----+-----+-----+-----+-----+(Dry ther.) 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 ther.) ------+----+----+----+----+----+----+----+----+-----+-----+-----+-----+-----+------ 19 10 19 20 13 6 20 21 16 9 2 21 22 19 12 6 22 23 21 15 9 2 23 24 24 17 11 6 24 25 26 20 14 8 3 25 26 28 23 17 11 6 26 27 30 25 19 14 9 3 27 28 33 27 22 17 11 6 1 28 29 35 29 24 19 14 9 4 29 30 36 31 26 22 17 12 7 2 30 31 38 33 29 24 19 14 10 5 31 32 40 35 31 26 21 17 12 8 3 32 33 42 37 33 28 24 19 15 10 6 2 33 34 44 39 35 30 26 21 17 13 9 4 34 35 45 41 37 32 28 24 19 15 12 7 3 35 36 47 43 38 34 30 26 22 18 14 10 6 2 36 37 48 44 40 36 32 28 24 20 16 12 8 5 1 37 38 50 46 42 38 34 30 26 22 18 15 11 7 3 38 39 52 48 44 40 36 32 28 24 20 17 13 9 6 39 40 53 49 45 41 38 34 30 26 22 19 16 12 8 40 41 54 50 46 43 39 36 32 29 24 21 18 14 10 41 42 55 51 48 44 40 37 34 30 27 23 20 16 13 42 43 56 52 49 46 42 38 35 32 29 25 22 19 15 43 44 57 53 50 47 43 40 37 33 30 27 24 21 17 44 45 58 54 51 48 44 41 38 35 32 29 25 22 19 45 46 58 55 52 49 46 42 39 36 33 30 27 23 21 46 47 59 56 53 50 47 44 40 38 34 31 28 25 22 47 48 60 56 53 51 48 45 42 39 36 33 30 27 24 48 49 60 57 54 52 49 46 43 40 37 34 31 29 26 49 50 61 58 55 52 50 47 44 41 38 36 33 30 27 50 51 62 59 56 53 50 48 45 42 39 37 34 31 28 51 52 63 60 57 54 51 48 46 43 40 38 35 33 30 52 53 63 61 58 55 52 49 47 44 42 39 36 34 31 53 54 64 61 59 56 53 50 48 45 43 40 38 35 32 54 55 65 62 59 57 54 51 49 46 43 41 39 36 34 55 56 65 63 60 57 55 52 50 47 44 42 40 37 35 56 57 66 64 61 58 55 53 50 48 45 43 40 38 36 57 58 67 64 61 59 56 53 51 49 46 44 42 39 37 58 59 67 65 62 60 57 54 52 49 47 45 43 40 38 59 60 68 65 63 60 58 55 53 50 48 46 44 41 39 60 61 68 66 63 61 58 56 54 51 49 47 44 42 40 61 62 69 66 64 61 59 57 54 52 50 47 45 43 41 62 63 69 67 64 62 60 57 55 53 51 48 46 44 42 63 64 70 67 65 62 60 58 56 53 51 49 47 45 43 64 65 70 68 65 63 61 59 56 54 52 50 48 46 44 65 66 71 68 66 63 61 59 57 55 53 51 49 47 45 66 67 71 69 66 64 62 60 58 55 53 51 49 47 45 67 68 71 69 67 65 63 60 58 56 54 52 50 48 46 68 69 72 70 67 65 63 61 59 57 55 53 51 49 47 69 70 72 70 68 66 64 62 60 57 55 53 52 50 48 70 71 72 70 68 66 64 62 60 58 56 54 52 50 48 71 72 73 71 69 67 65 63 61 59 57 55 53 51 49 72 73 73 71 69 67 65 63 61 59 57 55 53 52 50 73 74 74 72 70 68 66 64 62 60 58 56 54 52 50 74 75 74 72 70 68 66 64 62 60 58 56 55 53 51 75 76 74 72 70 68 66 64 63 61 59 57 55 53 52 76 77 74 73 71 69 67 65 63 61 59 57 56 54 52 77 78 75 73 71 69 67 65 63 62 60 58 56 54 53 78 79 75 73 71 70 68 66 64 62 60 58 57 55 53 79 80 75 73 72 70 68 66 64 63 61 59 57 55 54 80 ------+----+----+----+----+----+----+----+----+-----+-----+-----+-----+-----+------ _t._ 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 120 _t._ ======+====+====+====+====+====+====+====+====+=====+=====+=====+=====+=====+======

TABLE II.--RELATIVE HUMIDITY, PER CENT.

======+=============================================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(Dry ther.) 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 40 8 5 1 40 41 10 7 4 41 42 13 10 6 3 42 43 15 12 9 5 2 43 44 17 14 11 8 5 1 44 45 19 16 13 10 7 4 1 45 46 21 18 15 12 9 6 3 46 47 22 20 16 14 11 8 5 3 47 48 24 21 19 16 13 10 7 5 2 48 49 26 23 20 17 15 12 9 7 4 1 49 50 27 24 22 19 16 14 11 9 6 4 1 50 51 28 26 23 21 18 16 13 10 8 5 3 51 52 30 27 24 22 20 17 15 12 10 7 5 52 53 31 29 26 24 21 19 16 14 12 9 7 4 2 53 54 32 30 28 25 23 20 18 15 13 11 8 6 4 54 55 34 31 29 26 24 22 19 17 15 12 10 8 6 55 56 35 33 30 28 25 23 21 19 16 14 12 10 8 56 57 36 34 32 29 27 24 22 20 18 16 13 11 9 57 58 37 35 33 30 28 26 24 21 19 17 15 13 11 58 59 38 36 34 31 29 27 25 23 21 18 16 14 12 59 60 39 37 34 32 30 28 26 24 22 20 18 16 14 60 61 40 38 35 33 32 29 27 25 23 21 19 17 15 61 62 41 39 37 34 32 30 28 26 24 22 20 18 16 62 63 42 40 38 35 33 31 29 28 26 24 22 20 18 63 64 43 41 38 36 34 32 30 29 27 25 23 21 19 64 65 44 42 39 37 35 33 31 29 28 26 24 22 20 65 66 45 42 40 38 36 34 32 30 29 27 25 23 22 66 67 45 43 41 39 37 35 33 32 30 28 26 25 23 67 68 46 44 42 40 38 36 34 33 31 29 27 26 24 68 69 47 45 43 41 39 37 35 33 32 30 28 26 25 69 70 48 46 44 42 40 38 36 34 33 31 29 27 26 70 71 48 46 45 43 41 39 37 35 34 32 30 28 27 71 72 49 47 45 43 42 40 38 36 35 33 31 30 28 72 73 50 48 46 44 42 41 39 37 35 34 32 30 29 73 74 50 48 47 45 43 41 40 38 36 35 33 31 30 74 75 51 49 47 46 44 42 40 39 37 35 34 32 31 75 76 52 50 48 46 45 43 41 39 38 36 35 33 31 76 77 52 50 49 47 45 44 42 40 39 37 35 34 32 77 78 53 51 49 48 46 44 43 41 39 38 36 35 33 78 79 53 52 50 48 47 45 43 42 40 39 37 36 34 79 80 54 52 51 49 47 45 44 42 41 39 38 36 35 80 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 _t._ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

TABLE II.--RELATIVE HUMIDITY, PER CENT.

======+=============================================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(Dry ther.) 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0 ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------- 55 6 1 55 56 8 3 56 57 9 5 57 58 11 7 2 58 59 12 8 4 59 60 14 10 6 2 60 61 15 11 7 3 61 62 16 13 9 5 1 62 63 18 14 10 7 3 63 64 19 15 12 8 5 1 64 65 20 17 13 10 6 3 65 66 22 18 14 11 8 4 1 66 67 23 19 16 12 9 6 2 67 68 24 20 17 14 10 7 4 1 68 69 25 22 18 15 12 8 5 2 69 70 26 23 19 16 13 10 7 4 1 70 71 27 24 20 17 14 11 8 5 2 71 72 28 24 22 18 15 12 9 6 3 1 72 73 29 25 22 19 16 13 10 8 5 2 73 74 30 26 23 20 18 15 12 9 6 3 1 74 75 31 27 24 21 19 16 13 10 7 5 2 75 76 31 28 25 22 20 17 14 11 8 6 3 1 76 77 32 29 26 23 20 18 15 12 10 7 4 2 77 78 33 30 27 24 21 19 16 13 11 8 6 3 1 78 79 34 31 28 25 22 19 17 14 12 9 7 4 2 79 80 35 32 29 26 23 20 18 15 13 10 8 6 3 80 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0 _t._ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

TABLE II.--RELATIVE HUMIDITY, PER CENT.

======+=======================================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(Dry ther.) 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------- 80 96 92 87 83 79 75 72 68 64 61 57 54 80 81 96 92 88 84 80 76 72 68 65 61 58 54 81 82 96 92 88 84 80 76 72 69 65 62 58 55 82 83 96 92 88 84 80 76 73 69 66 62 59 55 83 84 96 92 88 84 80 77 73 69 66 63 59 56 84 85 96 92 88 84 80 77 73 70 66 63 60 56 85 86 96 92 88 84 81 77 73 70 67 63 60 57 86 87 96 92 88 84 81 77 74 70 67 64 60 57 87 88 96 92 88 85 81 77 74 71 67 64 61 58 88 89 96 92 88 85 81 78 74 71 68 64 61 58 89 90 96 92 88 85 81 78 75 71 68 65 62 59 90 91 96 92 89 85 82 78 75 71 68 65 62 59 91 92 96 92 89 85 82 78 75 72 69 65 62 59 92 93 96 93 89 85 82 78 75 72 69 66 63 60 93 94 96 93 89 86 82 79 75 72 69 66 63 60 94 95 96 93 89 86 82 79 76 72 69 66 63 60 95 96 96 93 89 86 82 79 76 73 70 67 64 61 96 97 96 93 89 86 82 79 76 73 70 67 64 61 97 98 96 93 89 86 83 79 76 73 70 67 64 61 98 99 96 93 89 86 83 80 76 73 70 68 65 62 99 100 97 93 90 86 83 80 77 74 71 68 65 62 100 101 97 93 90 86 83 80 77 74 71 68 65 62 101 102 97 93 90 86 83 80 77 74 71 68 65 63 102 103 97 93 90 87 83 80 77 74 71 69 66 63 103 104 97 93 90 87 83 80 77 74 72 69 66 63 104 105 97 93 90 87 84 81 78 75 72 69 66 64 105 106 97 93 90 87 84 81 78 75 72 69 66 64 106 107 97 93 90 87 84 81 78 75 72 69 67 64 107 108 97 93 90 87 84 81 78 75 72 70 67 64 108 109 97 93 90 87 84 81 78 75 73 70 67 65 109 110 97 94 90 87 84 81 78 76 73 70 67 65 110 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 _t._ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

TABLE II.--RELATIVE HUMIDITY, PER CENT.

======+=============================================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(Dry ther.) 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 80 54 51 47 44 41 38 35 32 29 26 23 20 18 80 81 54 51 48 44 41 38 35 33 30 27 24 21 19 81 82 55 52 48 45 42 39 36 33 31 28 25 22 20 82 83 55 52 49 46 43 40 37 34 31 29 26 23 21 83 84 56 53 49 46 44 41 38 35 32 29 27 24 22 84 85 56 53 50 47 44 41 38 36 33 30 28 25 22 85 86 57 54 51 48 45 42 39 36 34 31 29 26 23 86 87 57 54 51 48 45 42 40 37 34 32 30 27 24 87 88 58 55 52 49 46 43 40 38 35 32 30 27 25 88 89 58 55 52 49 46 44 41 38 36 33 31 28 26 89 90 59 56 53 50 47 44 41 39 36 34 32 29 26 90 91 59 56 53 50 47 45 42 39 37 35 33 30 27 91 92 59 56 54 51 48 45 43 40 37 35 33 30 28 92 93 60 57 54 51 48 46 43 41 38 36 34 31 29 93 94 60 57 54 52 49 46 44 41 39 36 34 31 29 94 95 60 58 55 52 49 47 44 42 39 37 35 32 30 95 96 61 58 55 53 50 47 45 42 40 37 36 33 30 96 97 61 58 56 53 50 48 45 43 40 38 36 33 31 97 98 61 59 56 53 51 48 46 43 41 38 37 34 32 98 99 62 59 56 54 51 49 46 44 41 39 37 34 32 99 100 62 59 57 54 51 49 47 44 42 39 37 35 33 100 101 62 60 57 54 52 49 47 45 42 40 38 36 33 101 102 63 60 57 55 52 50 47 45 43 40 38 36 34 102 103 63 60 58 55 53 50 48 45 43 41 39 37 34 103 104 63 61 58 55 53 51 48 46 44 41 39 37 35 104 105 64 61 58 56 53 51 49 46 44 42 40 38 35 105 106 64 61 59 56 54 51 49 47 44 42 40 38 36 106 107 64 62 59 57 54 52 49 47 45 43 41 38 36 107 108 64 62 59 57 54 52 50 47 45 43 41 39 37 108 109 65 62 60 57 55 52 50 48 46 44 41 39 37 109 110 65 62 60 57 55 53 50 48 46 44 42 40 38 110 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 _t._ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

TABLE II.--RELATIVE HUMIDITY, PER CENT.

======+=============================================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(Dry ther.) 24.0 25.0 26.0 27.0 28.0 29.0 30.0 31.0 32.0 33.0 34.0 35.0 36.0 ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 80 18 15 13 10 8 6 3 1 80 81 19 16 14 11 9 7 4 2 81 82 20 17 15 12 10 8 5 3 1 82 83 21 18 16 13 11 9 6 4 2 83 84 22 19 17 14 12 10 8 5 3 1 84 85 22 20 17 15 13 11 9 6 4 2 85 86 23 21 18 16 14 12 10 7 5 3 1 86 87 24 22 19 17 15 13 11 8 6 4 2 87 88 25 22 20 18 16 14 12 9 7 5 3 1 88 89 26 23 21 19 16 14 12 10 8 6 4 2 1 89 90 26 24 22 20 17 15 13 11 9 7 5 3 2 90 91 27 25 23 20 18 16 14 12 10 8 6 4 3 91 92 28 26 23 21 19 17 15 13 11 9 7 5 3 92 93 29 26 24 22 20 18 16 14 12 10 8 6 4 93 94 29 27 25 23 21 18 16 14 13 11 9 7 5 94 95 30 28 25 23 21 19 17 15 13 11 10 8 6 95 96 30 28 26 24 22 20 18 16 14 12 10 9 7 96 97 31 29 27 25 23 21 19 17 15 13 11 10 8 97 98 32 29 27 25 23 21 19 18 16 14 12 10 9 98 99 32 30 28 26 24 22 20 18 16 15 13 11 10 99 100 33 31 29 27 25 23 21 19 17 15 14 12 10 100 101 33 31 29 27 25 23 21 20 18 16 14 13 11 101 102 34 32 30 28 26 24 22 20 19 17 15 13 12 102 103 34 32 30 28 26 25 23 21 19 17 16 14 12 103 104 35 33 31 29 27 25 23 22 20 18 16 15 13 104 105 35 33 31 30 28 26 24 22 20 19 17 15 14 105 106 36 34 32 30 28 26 25 23 21 19 18 16 14 106 107 36 34 32 31 29 27 25 23 22 20 18 17 15 107 108 37 35 33 31 29 27 26 24 22 21 19 17 16 108 109 37 35 33 32 30 28 26 25 23 21 20 18 16 109 110 38 36 34 32 30 28 27 25 23 22 20 19 17 110 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 24.0 25.0 26.0 27.0 28.0 29.0 30.0 31.0 32.0 33.0 34.0 35.0 36.0 _t._ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

TABLE II.--RELATIVE HUMIDITY, PER CENT.

======+=======================================================================+====== _t_ Difference between the dry and wet thermometers (_t-t'_). _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(Dry ther.) 36.0 37.0 38.0 39.0 40.0 41.0 42.0 43.0 44.0 45.0 46.0 48.0 Ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 89 1 89 90 2 90 91 3 1 91 92 3 2 1 92 93 4 3 2 93 94 5 4 3 0 94 95 6 5 4 1 95 96 7 5 5 2 1 96 97 8 6 6 3 1 97 98 9 7 7 4 2 1 98 99 10 8 7 5 3 2 0 99 100 10 9 8 6 4 3 1 100 101 11 9 9 6 5 3 2 0 101 102 12 10 9 7 6 4 3 1 102 103 12 11 9 8 6 5 4 2 1 103 104 13 12 10 8 7 6 5 3 2 104 105 14 12 11 9 8 6 5 4 2 1 105 106 14 13 11 10 8 7 6 4 3 2 0 106 107 15 14 12 11 9 8 6 5 4 3 1 107 108 16 14 13 11 10 9 7 6 5 3 2 108 109 16 15 13 12 10 9 8 7 5 4 3 109 110 17 15 14 13 11 10 8 7 6 5 3 1 110 ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ _t._ 36.0 37.0 38.0 39.0 40.0 41.0 42.0 43.0 44.0 45.0 46.0 48.0 _t._ ======+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+======

TABLE III.--REDUCTION OF BAROMETER READING TO 32.

===+========================================================================================= Inches.

+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+----- F 24.0 24.5 25.0 25.5 26.0 26.5 27.0 27.5 28.0 28.5 29.0 29.5 30.0 30.5 31.0 ---+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+----- 30 -.003 -.003 -.003 -.003 -.003 -.003 -.003 -.003 -.003 -.004 -.004 -.004 -.004 -.004 -.004 31 .005 .005 .005 .005 .006 .006 .006 .006 .006 .006 .006 .006 .006 .007 .007 32 .007 .008 .008 .008 .008 .008 .008 .008 .009 .009 .009 .009 .009 .009 .009 33 .010 .010 .010 .010 .010 .010 .011 .011 .011 .011 .012 .012 .012 .012 .012 34 .012 .012 .012 .012 .013 .013 .013 .013 .014 .014 .014 .014 .015 .015 .015 35 .014 .014 .014 .015 .015 .015 .016 .016 .016 .016 .017 .017 .017 .018 .018 36 .016 .016 .017 .017 .017 .018 .018 .018 .019 .019 .019 .020 .020 .020 .021 37 .018 .019 .019 .019 .020 .020 .021 .021 .021 .022 .022 .022 .023 .023 .024 38 .020 .021 .021 .022 .022 .022 .023 .023 .024 .024 .025 .025 .026 .026 .026 39 .023 .023 .024 .024 .024 .025 .025 .026 .026 .027 .027 .028 .028 .029 .029 40 .025 .025 .026 .026 .027 .027 .028 .028 .029 .030 .030 .030 .031 .031 .032 41 .027 .027 .028 .029 .029 .030 .030 .031 .031 .032 .033 .033 .034 .034 .035 42 .029 .030 .030 .031 .032 .032 .033 .033 .034 .034 .035 .036 .036 .037 .038 43 .031 .032 .033 .033 .034 .035 .035 .036 .036 .037 .038 .038 .039 .040 .040 44 .033 .034 .035 .035 .036 .037 .038 .038 .039 .040 .040 .041 .042 .042 .043 45 .036 .037 .037 .038 .039 .039 .040 .041 .042 .042 .043 .044 .045 .045 .046 46 .038 .038 .039 .040 .041 .042 .043 .043 .044 .045 .046 .046 .047 .048 .049 47 .040 .041 .042 .042 .043 .044 .045 .046 .047 .048 .048 .049 .050 .051 .052 48 .042 .043 .044 .045 .046 .047 .047 .048 .049 .050 .051 .052 .053 .053 .054 49 .044 .045 .046 .047 .048 .049 .050 .051 .052 .052 .054 .054 .055 .056 .057 50 .046 .047 .048 .049 .050 .051 .052 .053 .054 .055 .056 .057 .058 .059 .060 51 .049 .050 .051 .052 .053 .054 .055 .056 .057 .058 .059 .060 .061 .062 .063 52 .051 .052 .053 .054 .055 .056 .057 .058 .059 .060 .061 .062 .064 .065 .066 53 .053 .054 .055 .056 .057 .058 .060 .061 .062 .063 .064 .065 .066 .067 .068 54 .055 .056 .057 .058 .060 .061 .062 .063 .064 .065 .067 .068 .069 .070 .071 55 .057 .058 .060 .061 .062 .063 .064 .065 .066 .068 .069 .070 .071 .073 .074 56 .060 .061 .062 .063 .064 .065 .067 .068 .069 .070 .072 .073 .074 .075 .077 57 .062 .063 .064 .065 .067 .068 .069 .070 .072 .073 .075 .076 .077 .078 .080 58 .064 .065 .066 .068 .069 .070 .071 .073 .074 .076 .077 .078 .080 .081 .082 59 .066 .068 .069 .070 .072 .073 .074 .075 .077 .078 .080 .081 .083 .084 .085 60 .068 .070 .071 .072 .074 .076 .077 .078 .079 .081 .082 .084 .085 .086 .088 61 .070 .072 .073 .074 .076 .077 .079 .080 .082 .083 .085 .086 .088 .089 .091 62 .073 .074 .076 .077 .079 .080 .082 .083 .085 .086 .088 .089 .091 .092 .094 63 .075 .076 .078 .079 .081 .082 .084 .085 .087 .088 .090 .091 .093 .095 .096 64 .077 .078 .080 .081 .083 .085 .086 .088 .090 .091 .093 .094 .096 .097 .099 65 -.079 -.080 -.082 -.084 -.086 -.087 -.089 -.090 -.092 -.093 -.095 -.097 -.099 -.100 -.102 ===+=========================================================================================

TABLE III.--REDUCTION OF BAROMETER READING TO 32.--_Continued._

===+========================================================================================= Inches.

+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+----- F 24.0 24.5 25.0 25.5 26.0 26.5 27.0 27.5 28.0 28.5 29.0 29.5 30.0 30.5 31.0 ---+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+----- 65 -.079 -.080 -.082 -.084 -.086 -.087 -.089 -.090 -.092 -.093 -.095 -.097 -.099 -.100 -.102 66 .081 .083 .085 .086 .088 .089 .091 .093 .095 .096 .098 .099 .101 .103 .105 67 .083 .085 .087 .088 .090 .092 .094 .095 .097 .099 .101 .102 .104 .106 .108 68 .085 .087 .089 .090 .093 .094 .096 .098 .100 .101 .103 .105 .107 .108 .110 69 .088 .089 .091 .093 .095 .097 .099 .100 .102 .104 .106 .107 .110 .111 .113 70 .090 .092 .094 .096 .097 .099 .101 .103 .105 .106 .109 .110 .112 .114 .116 71 .092 .094 .096 .098 .100 .101 .103 .105 .107 .109 .111 .113 .115 .116 .119 72 .094 .096 .098 .100 .102 .104 .106 .108 .110 .112 .114 .116 .118 .120 .122 73 .096 .098 .100 .102 .104 .106 .108 .110 .112 .114 .116 .118 .120 .122 .124 74 .098 .100 .103 .105 .107 .109 .111 .113 .115 .117 .119 .121 .123 .125 .127 75 .101 .102 .105 .106 .109 .111 .113 .115 .117 .119 .122 .124 .126 .128 .130 76 .103 .104 .107 .109 .111 .113 .116 .118 .120 .122 .124 .126 .128 .130 .133 77 .105 .107 .109 .111 .114 .116 .118 .120 .122 .124 .127 .129 .131 .133 .136 78 .107 .109 .112 .113 .116 .118 .120 .122 .125 .127 .129 .131 .134 .136 .138 79 .109 .111 .114 .116 .118 .120 .123 .125 .127 .129 .132 .134 .137 .139 .141 80 .111 .113 .116 .118 .121 .123 .125 .127 .130 .132 .135 .137 .139 .141 .144 81 .114 .116 .118 .120 .123 .125 .128 .130 .132 .134 .137 .139 .142 .144 .147 82 .116 .118 .121 .122 .125 .128 .130 .132 .135 .137 .140 .142 .145 .147 .149 83 .118 .120 .123 .125 .128 .130 .133 .135 .138 .140 .142 .145 .147 .149 .152 84 .120 .122 .125 .127 .130 .132 .135 .138 .140 .142 .145 .147 .150 .152 .155 85 .122 .124 .127 .129 .132 .134 .137 .139 .143 .145 .148 .150 .153 .155 .158 86 .124 .126 .128 .130 .135 .137 .140 .143 .145 .148 .150 .153 .155 .158 .161 87 .126 .129 .132 .134 .137 .139 .142 .144 .148 .150 .153 .155 .158 .161 .163 88 .129 .131 .134 .137 .139 .142 .145 .147 .150 .152 .155 .158 .161 .163 .166 89 .131 .133 .136 .139 .142 .144 .147 .150 .153 .155 .158 .161 .164 .166 .169 90 .133 .136 .138 .141 .144 .147 .150 .153 .155 .157 .161 .164 .166 .169 .172 91 .135 .138 .141 .143 .146 .149 .152 .155 .158 .160 .163 .166 .169 .172 .175 92 .137 .140 .143 .146 .149 .152 .154 .157 .160 .163 .166 .169 .172 .175 .177 93 .139 .142 .145 .148 .151 .154 .157 .160 .163 .166 .168 .171 .174 .177 .180 94 .142 .145 .147 .150 .153 .156 .159 .162 .165 .168 .171 .174 .177 .180 .183 95 .144 .147 .150 .153 .156 .159 .162 .165 .168 .171 .174 .177 .180 .183 .186 96 .146 .149 .152 .155 .158 .161 .164 .167 .170 .173 .176 .179 .182 .185 .188 97 .148 .151 .154 .157 .160 .164 .167 .170 .173 .176 .179 .182 .185 .188 .191 98 .150 .153 .156 .160 .163 .166 .169 .172 .175 .178 .181 .185 .188 .191 .194 99 .152 .155 .159 .162 .165 .168 .171 .175 .178 .181 .184 .187 .190 .194 .197 100 -.154 -.157 -.161 -.164 -.167 -.171 -.174 -.177 -.180 -.184 -.187 -.190 -.193 -.197 -.200 ---+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----

TABLE IV.--TABLE FOR REDUCING OBSERVATIONS OF THE BAROMETER TO SEA LEVEL, CORRECTION ADDITIVE.

==========+======================================================================= Height, in Temperature of external air--degrees Fahrenheit.

feet. +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+----- -20 -10 0 10 20 30 40 50 60 70 80 90 100 ----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+----- 10 .013 .013 .012 .012 .012 .012 .011 .011 .011 .011 .010 .010 .010 20 .026 .025 .025 .024 .023 .023 .023 .022 .022 .021 .021 .020 .020 30 .039 .038 .037 .036 .035 .034 .034 .033 .032 .032 .031 .030 .030 40 .052 .050 .049 .048 .047 .046 .045 .044 .043 .042 .041 .040 .040 50 .065 .063 .061 .060 .059 .058 .056 .055 .054 .053 .052 .051 .050 60 .077 .076 .074 .072 .070 .069 .068 .066 .065 .063 .062 .061 .059 70 .090 .088 .086 .084 .082 .081 .078 .077 .076 .074 .072 .071 .069 80 .103 .101 .098 .096 .094 .092 .090 .088 .086 .084 .082 .081 .079 90 .116 .113 .111 .108 .105 .104 .101 .099 .097 .095 .093 .091 .089 100 .129 .126 .123 .120 .117 .115 .112 .110 .108 .105 .103 .101 .099 110 .142 .139 .135 .132 .129 .126 .123 .121 .119 .116 .113 .111 .109 120 .155 .151 .148 .144 .140 .138 .134 .132 .129 .126 .124 .121 .119 130 .168 .164 .160 .156 .152 .149 .146 .143 .140 .137 .134 .131 .129 140 .181 .176 .172 .168 .164 .161 .157 .154 .151 .147 .144 .141 .139 150 .194 .189 .185 .180 .176 .172 .168 .165 .162 .158 .155 .152 .149 160 .206 .201 .197 .192 .187 .183 .179 .176 .172 .168 .165 .162 .158 170 .219 .214 .209 .204 .199 .195 .190 .187 .183 .179 .175 .172 .168 180 .232 .227 .222 .216 .211 .206 .202 .198 .194 .189 .185 .182 .178 190 .245 .239 .234 .228 .222 .218 .213 .209 .204 .200 .196 .192 .188 200 .258 .252 .246 .240 .234 .229 .224 .220 .215 .210 .206 .202 .198 210 .271 .264 .258 .252 .246 .240 .235 .231 .226 .221 .216 .212 .208 220 .284 .277 .270 .264 .257 .252 .246 .242 .236 .231 .227 .222 .218 230 .296 .289 .283 .276 .269 .263 .257 .253 .247 .242 .237 .232 .228 240 .309 .302 .295 .288 .281 .275 .269 .264 .258 .252 .248 .242 .238 250 .322 .314 .307 .300 .293 .286 .280 .275 .269 .263 .258 .253 .248 260 .335 .327 .319 .311 .304 .297 .291 .285 .279 .273 .268 .263 .257 270 .348 .339 .331 .323 .316 .309 .302 .296 .290 .284 .278 .273 .267 280 .360 .352 .344 .335 .328 .320 .314 .307 .301 .294 .288 .283 .277 290 .373 .364 .356 .347 .339 .332 .325 .318 .311 .305 .299 .293 .287 300 .386 .377 .368 .359 .351 .343 .336 .329 .322 .315 .309 .303 .297 310 .399 .389 .380 .371 .363 .354 .347 .340 .333 .326 .319 .313 .307 320 .412 .402 .392 .383 .374 .366 .358 .351 .343 .336 .329 .323 .317 330 .424 .414 .404 .395 .386 .377 .369 .362 .354 .347 .340 .333 .326 340 .437 .427 .416 .407 .397 .389 .380 .373 .365 .357 .350 .343 .336 350 .450 .439 .429 .419 .409 .400 .392 .384 .376 .368 .360 .353 .346 360 .463 .451 .441 .430 .421 .411 .403 .394 .386 .378 .370 .363 .356 370 .476 .464 .453 .442 .432 .423 .414 .405 .397 .389 .380 .373 .366 380 .488 .476 .465 .454 .444 .434 .425 .416 .408 .399 .391 .383 .375 390 .501 .489 .477 .466 .455 .446 .436 .427 .418 .410 .401 .393 .385 400 .514 .501 .489 .478 .467 .457 .447 .438 .429 .420 .411 .403 .395 410 .527 .513 .501 .490 .479 .468 .458 .449 .440 .430 .421 .413 .405 420 .539 .526 .513 .502 .490 .480 .469 .460 .450 .441 .431 .423 .415 430 .552 .538 .525 .513 .502 .491 .480 .470 .461 .451 .442 .433 .425 440 .565 .551 .537 .525 .513 .502 .491 .481 .471 .462 .452 .443 .434 450 .578 .563 .550 .537 .525 .513 .503 .492 .482 .472 .462 .453 .444 460 .590 .575 .562 .549 .537 .525 .514 .503 .493 .482 .472 .463 .454 470 .603 .588 .574 .561 .548 .536 .525 .514 .503 .493 .482 .473 .464 480 .616 .600 .586 .572 .560 .547 .536 .524 .514 .503 .493 .483 .474 490 .628 .613 .598 .584 .571 .559 .547 .535 .524 .514 .503 .493 .483 500 .641 .625 .610 .596 .583 .570 .558 .546 .535 .524 .513 .503 .493 510 .654 .637 .622 .608 .594 .581 .569 .557 .545 .534 .523 .513 .503 520 .666 .650 .634 .620 .606 .593 .580 .568 .556 .545 .533 .523 .513 530 .679 .662 .646 .631 .617 .604 .591 .578 .566 .555 .544 .533 .522 540 .691 .675 .658 .643 .629 .615 .602 .589 .577 .565 .554 .543 .532 ====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====

TABLE IV.--FOR REDUCING OBSERVATIONS OF THE BAROMETER TO SEA LEVEL.--_Continued._

==========+======================================================================= Height, in Temperature of external air--degrees Fahrenheit.

feet. +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+----- -20 -10 0 10 20 30 40 50 60 70 80 90 100 ----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+----- 550 .704 .687 .670 .655 .640 .626 .613 .600 .587 .575 .564 .553 .542 560 .717 .699 .683 .667 .652 .638 .624 .611 .598 .586 .574 .563 .552 570 .729 .712 .695 .679 .663 .649 .635 .622 .608 .596 .584 .573 .562 580 .742 .724 .707 .690 .675 .660 .646 .632 .619 .606 .595 .583 .571 590 .754 .737 .719 .702 .686 .672 .657 .643 .629 .617 .605 .593 .581 600 .767 .749 .731 .714 .698 .683 .668 .654 .640 .627 .615 .603 .591 610 .780 .761 .743 .726 .709 .694 .679 .665 .650 .637 .625 .613 .601 620 .792 .774 .755 .738 .721 .705 .690 .675 .661 .648 .635 .623 .611 630 .805 .786 .767 .749 .732 .717 .701 .686 .671 .658 .645 .633 .620 640 .817 .798 .779 .761 .744 .728 .712 .697 .682 .668 .655 .643 .630 650 .830 .811 .791 .773 .755 .739 .723 .708 .692 .679 .666 .653 .640 660 .843 .823 .803 .785 .767 .750 .734 .718 .703 .689 .676 .662 .650 670 .855 .835 .815 .797 .778 .761 .745 .729 .713 .699 .686 .672 .660 680 .868 .847 .827 .808 .790 .773 .756 .740 .724 .709 .696 .682 .669 690 .880 .860 .839 .820 .801 .784 .767 .750 .734 .720 .706 .692 .679 700 .893 .872 .851 .832 .813 .795 .778 .761 .745 .730 .716 .702 .689 710 .905 .884 .863 .844 .824 .806 .789 .772 .755 .740 .726 .712 .698 720 .918 .896 .875 .855 .836 .817 .800 .782 .766 .751 .736 .722 .708 730 .930 .909 .887 .867 .847 .829 .811 .793 .776 .761 .746 .732 .718 740 .943 .921 .899 .879 .859 .840 .822 .804 .787 .771 .756 .742 .728 750 .955 .933 .911 .891 .870 .851 .833 .815 .797 .782 .767 .752 .738 760 .968 .945 .922 .902 .881 .862 .843 .825 .808 .792 .777 .761 .747 770 .980 .957 .934 .914 .893 .873 .854 .836 .818 .802 .787 .771 .757 780 .993 .970 .946 .926 .904 .885 .865 .847 .829 .812 .797 .781 .767 790 1.005 .982 .958 .937 .916 .896 .876 .857 .839 .823 .807 .791 .776 800 1.018 .994 .970 .949 .927 .907 .887 .868 .850 .833 .817 .801 .786 810 1.030 1.006 .982 .961 .938 .918 .898 .878 .860 .843 .827 .811 .796 820 1.043 1.018 .994 .972 .950 .929 .909 .889 .871 .854 .937 .821 .805 830 1.055 1.031 1.006 .984 .961 .940 .920 .900 .881 .864 .847 .831 .815 840 1.068 1.043 1.018 .995 .973 .951 .931 .911 .892 .874 .857 .841 .825 850 1.080 1.055 1.030 1.007 .984 .962 .942 .922 .902 .885 .867 .851 .835 860 1.093 1.067 1.041 1.019 .995 .974 .952 .932 .913 .895 .877 .860 .844 870 1.105 1.079 1.053 1.030 1.007 .985 .963 .943 .923 .905 .887 .870 .854 880 1.118 1.092 1.065 1.042 1.018 .996 .974 .954 .934 .915 .897 .880 .864 890 1.130 1.104 1.077 1.053 1.030 1.007 .985 .904 .944 .926 .907 .890 .873 900 1.143 1.116 1.089 1.065 1.041 1.018 .996 .975 .955 .936 .917 .900 .883 910 1.155 1.128 1.101 1.077 1.052 1.029 1.007 .986 .965 .946 .927 .910 .893 920 1.168 1.140 1.113 1.088 1.064 1.040 1.018 .996 .976 .956 .937 .920 .902 930 1.180 1.152 1.125 1.100 1.075 1.051 1.029 1.007 .986 .967 .947 .929 .912 940 1.193 1.164 1.137 1.111 1.086 1.062 1.040 1.017 .997 .977 .957 .939 .921 950 1.205 1.177 1.149 1.123 1.098 1.074 1.051 1.028 1.007 .987 .967 .949 .931 960 1.217 1.189 1.160 1.135 1.109 1.085 1.061 1.039 1.017 .997 .977 .959 .941 970 1.230 1.201 1.172 1.146 1.120 1.096 1.072 1.049 1.028 1.007 .987 .969 .950 980 1.242 1.213 1.184 1.158 1.131 1.107 1.083 1.060 1.038 1.018 .997 .978 .960 990 1.255 1.225 1.196 1.169 1.143 1.118 1.094 1.070 1.049 1.028 1.007 .988 .969 1000 1.267 1.237 1.208 1.181 1.154 1.129 1.105 1.081 1.059 1.038 1.017 .998 .979 1010 1.279 1.249 1.220 1.192 1.165 1.140 1.116 1.092 1.069 1.048 1.027 1.008 .989 1020 1.292 1.261 1.232 1.204 1.177 1.151 1.127 1.102 1.080 1.058 1.037 1.018 .998 1030 1.304 1.273 1.243 1.215 1.188 1.162 1.137 1.113 1.090 1.069 1.047 1.027 1.008 1040 1.317 1.285 1.255 1.227 1.199 1.173 1.148 1.123 1.101 1.079 1.057 1.037 1.017 1050 1.329 1.298 1.267 1.238 1.211 1.184 1.159 1.134 1.111 1.089 1.067 1.047 1.027 1060 1.341 1.310 1.279 1.250 1.222 1.195 1.170 1.145 1.121 1.099 1.077 1.057 1.037 1070 1.354 1.322 1.291 1.261 1.233 1.206 1.181 1.155 1.132 1.109 1.087 1.067 1.046 1080 1.366 1.334 1.302 1.273 1.244 1.217 1.191 1.166 1.142 1.120 1.097 1.076 1.056 1090 1.379 1.346 1.314 1.284 1.256 1.228 1.202 1.176 1.153 1.130 1.107 1.086 1.065 ====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====

TABLE IV.--FOR REDUCING OBSERVATIONS OF THE BAROMETER TO SEA LEVEL.--_Continued._

==========+======================================================================= Height, in Temperature of external air--degrees Fahrenheit.