The Scientific American Boy Part 12

[Ill.u.s.tration: Fig. 173. The Ice Boat Completed.]

The jib-sail was now cut out to the dimensions given in Fig. 172. The foot of the sail was lashed to a jib-boom 3 feet 4 inches long. The jib-boom was attached to the backbone at its fore end by means of a couple of screw eyes. The eye of one of these was pried open, linked through the other and then closed again. One of the screw eyes was now screwed into the head of the jib-boom and the other was threaded into the end of the backbone. The upper corner or "head" of the jib was tied to a jib-halyard, which pa.s.sed through a block at the top of the mast, and was secured on a cleat on the backbone. On the jib we used two sheets. They were attached to the end of the jib-boom and pa.s.sed on opposite sides of the mast through blocks on the crosspiece to the stern of the boat, where separate cleats were provided for them.

This completed our ice boat, and a very pretty little boat she was. It was with great reluctance that we furled the sails, unstepped the mast, and stowed away the parts in our attic until old Jack Frost should wake up and furnish us with a field of smooth ice.

THE SLEDGE.

[Ill.u.s.tration: Fig. 174. A s.p.a.cing Block.]

[Ill.u.s.tration: Fig. 175. The Runners and Rails s.p.a.ced Apart.]

Our sledge was patterned after a picture of one used by Peary in one of his Arctic expeditions. First we got four strips of hickory 1 inch thick, 1-1/2 inches wide and 8 feet long for the runners and side rails.

Beginning 18 inches from the ends, each stick was tapered gradually to a thickness of 1/2 an inch. Then we made eight spreaders or s.p.a.cing blocks, each 1-1/2 inches thick, 2-1/2 inches wide and 11 inches long.

In each end a notch 1/2 inch deep was cut to receive the runners and side rails. In the edge of each block, midway of its length, a slot 1 inch deep was cut to receive the cross sticks of the sledge. First we nailed the runners and rails to the blocks, fastening them with screws, s.p.a.cing the blocks 16 inches from the ends, and 20 inches apart from center to center. Then we bent the ends of the rails and runners together, fastening them with bolts, as in Fig. 175. Four crosspieces, or floor beams, were cut out of a 1-inch board, each 2 inches wide and 30 inches long. These were fitted into the slots in the s.p.a.ce blocks and secured with screws. A cross stick was also fastened between the rails and runners at the forward end. On the floor beams we nailed a flooring of 1/2-inch slats, 2 inches wide and 6 feet long. At the rear end these slats projected 8 inches beyond the last s.p.a.ce block and over them a cross slat was nailed. A stick of hickory 4-1/2 feet long was soaked in hot water, as described on page 39, and was bent to an U-shape. The ends were then fitted over the first cross stick, and under the first floor supports, and securely nailed in place. Another stick of hickory 6 feet long was similarly bent, and the ends slipped over the rear cross slats and fitted against the rear s.p.a.ce blocks, in which position the stick was securely nailed.

[Ill.u.s.tration: Fig. 176. The Sledge.]

It was our intention to shoe the runners with strips of bra.s.s, but these were not procurable in our village, and we had no time to go down to Millville. However, the village blacksmith came to our rescue and shod our sledge with sleigh runner iron.

We had planned to make two more devices for our winter sports--a toboggan and a peculiar looking contrivance called a "rennwolf," a picture of which Dutchy happened to unearth in one of his father's books. Unfortunately Bill and I had to return to school before either of these was completed. However, the work was entrusted to Reddy, who was quite handy with tools, and Jack, who was made secretary _pro tempore_, took notes on the work.

THE TOBOGGAN.

[Ill.u.s.tration: Fig. 177. Tying Down the Head Piece of the Toboggan.]

The toboggan was made of light flexible hickory boards, 1/4 of an inch thick, 6 inches wide and 8 feet long. Three of these boards were used, and they were fastened together with cross sticks or battens, about 3 inches wide and 1/2 an inch thick. There were six of these battens s.p.a.ced about 15 inches apart, and secured to the floor boards with flathead screws introduced from the under side and countersunk so that the heads would not project below the bottom of the toboggan. At the forward end we screwed on a head piece of oak, 3/4 of an inch thick, 1-1/2 inches wide and 20 inches long. The head piece was fastened to the under side of the boards, so that when they were curved up into a hood it would lie on top. The ends of the head piece, which projected 1 inch each side of the boards, were notched to hold the rope, which was tied fast after the boards had been steamed. The boards were steamed by wrapping them in burlap for a distance of 2 feet from the forward end, and pouring boiling water over them, as was done with the snow shoes (page 39). Before bending the boards we had fixed screw eyes in the ends of each batten, except the forward one; a rope had been strung through these screw eyes and the ends were now tied to the head piece and drawn tight so as to bend the boards into a graceful curve. In this way the ropes were of service not only for curving the front end into a hood, but also for side rails, to hold on by when shooting swiftly around curves.

[Ill.u.s.tration: Fig. 178. The Toboggan.]

THE RENNWOLF.

The runners of the rennwolf were made of hickory strips, 1 inch thick, 2 inches wide and 8 feet long. At their forward ends these strips were tapered down to a thickness of 1/2 an inch and curved upward. About 30 inches from the rear end of each runner an upright post was nailed. The post was 3 feet long and was braced by a diagonal brace 24 inches long, as shown in Fig. 179. A tie bar was nailed to the post about 6 or 8 inches from the bottom and connected with the forward curved end of the runner.

[Ill.u.s.tration: Fig. 179. Dimensions of Rennwolf.]

The two runners were now placed parallel to each other about 18 inches apart, and connected by four cross bars, one at the forward end, and three on the upright posts, in about the positions ill.u.s.trated. The upper cross bar was extended 6 inches beyond the posts at each side, and served as a handle for guiding the queer craft. An 18-inch square board was used for the seat of the rennwolf. It rested on the second cross-bar of the post about 12 inches from the runners, and the forward end was supported on legs nailed to the tie bars. On each runner back of the posts a loop of leather was nailed, large enough to receive the toe of one shoe.

When using this odd sled one foot would rest on the runner with the toe in the strap, and by kicking out against the snow or ice with the other foot the rennwolf would be made to spin along at a rapid rate. Of course, when coasting both feet would rest on the runners and the sled was steered by an occasional side push at the right or left. Owing to the great length of the runners the rennwolf would easily ride over uneven surfaces and thin spots in the ice.

[Ill.u.s.tration: Fig. 180. The Rennwolf in Use.]

ICE CREEPERS.

[Ill.u.s.tration: Fig. 181. The Ice Creeper.]

In order to provide a better hold for the propelling foot, we fastened around the toe a strap of leather, through which a number of long tacks projected. Their sharp points would stick into the ice, and prevent the foot from slipping. The seat of the rennwolf was convenient for carrying a coat or any light luggage, and it was often used to give a friend a very exhilarating ride.

CHAPTER XV.

THE SUBTERRANEAN CLUB.

I am afraid we were not very glad to get back to school that fall. It seemed very hard to give up the sport we had been having, and our heads were brimful of new schemes which we could hardly wait to put into practice. But we soon learned that there are many things that could be done during recreation hours at school. We had intended building a cave on our island that summer, but our vacation came to an end before we got around to it. There seemed no reason why we shouldn't dig one in the woods at the back of the schoolhouse.

A CAVE-IN.

Bill had read somewhere that if you dig a cave under a tree the roots of the tree will support the ground on top and make a natural and substantial roof. It sounded very reasonable, we thought; in fact, we never questioned the truth of the statement, because we had somehow gotten the notion that books were never wrong, and that whatever was set up in type must surely be so. But events proved that the man who wrote that book had never attempted to build a cave in the manner he described, at least not in the loose, sandy soil of south Jersey. A large spreading cedar was selected as the tree which should support the roof of our cave. It was situated on a mound at the edge of the woods.

First a pa.s.sageway, or ditch, was dug at the bottom, and then we begun tunneling in the side of the mound under the roots of the tree. For a while the ground above held, and our tunnel had reached a length of about four feet, when suddenly, without the slightest warning, the sandy soil gave way and we were engulfed. Bill, who was furthest within the cave, was almost entirely covered, while I was buried to the shoulders.

A crowd of boys came to our a.s.sistance and dug us out. Poor Bill was almost smothered before they scooped the sand away from around his mouth and nose. The boys made slow work of it, having to dig with their hands and a couple of s.h.i.+ngles, because the two spades we had were buried with us at the bottom of the cave.

Of course, this little episode gave us a scare, but it was only temporary. We swore every one to secrecy, so that Mr. Clark, the princ.i.p.al, wouldn't hear of the mishap and suppress any further cave building. It was obvious that the only roof we could depend on for our cave would be a wooden roof. If we had been at Willow Clump Island we would have gotten any amount of slabs from the lumber mills across the river.

One of our schoolmates, a day scholar, came to the rescue. His name was Chester Hill, a little bit of a chap, about the shortest for his age that I have ever seen. His name was so at variance to his size that we called him "Hillock," for short. Now Hillock lived on a farm about eight miles from school, and used to drive in every day on a farm wagon. He had helped us dig the cave under the cedar tree, and when he learned that we would need some lumber to build a safe cave, he told us that he had an uncle who owned a lumber mill on the Morris River, from whom he was sure we could get all the slabs we wanted. Of course, we were delighted, and laid our plans for an elaborate cave house. Hillock promised to be on hand on the following Sat.u.r.day afternoon with his load of lumber.

EXCAVATING FOR THE CAVE.

We immediately set out to make the necessary excavation. The side of a bushy knoll was chosen as a suitable site. First we carefully transplanted the bushes that grew in the square we had marked out for the cave, and cutting the sod into squares, piled it all neatly to one side. Then we shoveled away the top-soil and heaped it up for future use. After that we dug away the sandy subsoil. The cave proper we planned to make about 8 feet by 10 feet, with a pa.s.sageway 2 feet wide and 6 feet long, leading in from a large bush at the base of the knoll.

Our excavation was therefore somewhat T-shaped (see Fig. 182). At the deepest part we had to dig down about 10 feet.

[Ill.u.s.tration: Fig. 182. Excavation for the Cave.]

[Ill.u.s.tration: Fig. 183. Framework of the Cave.]

The digging was all done by Sat.u.r.day, when Hillock pulled up with a big load of slabs. Slabs are a very unsatisfactory kind of wood for most purposes. Being the outside cut, they are usually very irregular and weak in spots. In many places they are almost clear bark. Of course, had our pocketbooks permitted, we would have used stout scantlings for the corner posts of our cave house and substantial boards for the walls, roof and flooring, but we had to be content with materials at hand.

Eight of the best slabs were selected for our corner posts; four of them we cut to the length of 8 feet and the others to a length of 6 feet. The long slabs were set up at the rear of the cave, two at each corner, one flat against the rear wall, with its edge buried in the corner, and the other against the side wall, with its edge tight against the rear slab, as in Fig. 183. The same was done at the forward corners with the shorter slabs. A couple of slabs were now set up on each side of the pa.s.sageway, and a corresponding pair against the rear wall. The upper and lower ends of the uprights were then connected with slabs, called stringpieces.

[Ill.u.s.tration: Fig. 184. The Siding and Flooring.]

The sides were now boarded up with upright slabs nailed to the stringpieces. An opening 3 feet 6 inches high was left in the forward wall for a pa.s.sageway. Several slabs were now placed on the edge across the bottom of the cave, to serve as floor beams, upon which a flooring of slabs was laid. Next the rafters were set in place, one on each upright slab. Slots were cut in the ends of the uprights to receive the rafters, which were slabs placed on edge. As the forward uprights were 2 feet shorter than the rear ones, the rafters were given a good slant, so that the roof would properly shed any water that might soak in through the ground above.

[Ill.u.s.tration: Fig. 185. Notching in the Rafters.]

The roof was laid on the same way that we had made the roof of our tree house; that is, a slab was first nailed at the forward end of the rafters with its edge projecting far enough to make a good eave; then the second slab was nailed on, with its edge overlapping the first, and a third with its edge overlapping the second, and so on with the rest.

At the rear end of the roof a hole was cut, into which we fitted a piece of stovepipe. We didn't plan to have a fire in the house, but set the stovepipe in place to provide the necessary ventilation. As the pipe had an elbow in it, there was no danger of rain or dirt falling through it.

The upper end of the stovepipe was concealed among some rocks at the top of the knoll.

A suitable flooring was now laid in the pa.s.sageway, and the sides were boarded up to a height of 2 feet from the floor at the entrance to a height of 3 feet 6 inches at the inner end. A roof of slabs was nailed on, and then we were ready to cover our slab house with dirt.