A Catechism of Familiar Things Part 54

What is the Gulf Stream?

It is a warm current in the Atlantic Ocean.

What is its origin?

It may be considered as beginning on the west coast of Africa, within the region of the trade winds. These cause a westward flow, known as the equatorial current. On reaching the coast of Brazil, the greater portion of this current bends northward, carrying with it the waters of the Amazon and Orinoco, and pa.s.ses through the Caribbean Sea into the Gulf of Mexico. Here it is further heated, and rushes out through the only outlet, the Straits of Florida.

Describe its course.

Deep and narrow, it runs by Florida with a velocity varying from two to five miles an hour, and pressed by the cold current between it and the sh.o.r.e, flows parallel to the coast as far as Cape Hatteras.

Meeting shoals near this point, the banks of sand extending as far as Newfoundland, it there turns abruptly to the east, and with diminished speed and increased width, rolls onward towards the coast of Europe.

Before long it divides into two great branches--the northern and southern. The former extends as far as Spitzbergen; the latter, sweeping along by the Madeira and Canary Islands, returns to the equator, completing the circuit.

What influence has the Gulf Stream on the climate of Europe?

Various opinions have been expressed as to this. It has been estimated that the amount of heat arising from the stream on a winter's day, is sufficient to raise the atmosphere over the British Isles from the freezing point to a summer temperature.

How may the Gulf Stream be distinguished?

It can be distinctly traced in the ocean by its dark indigo color, its temperature, and the swiftness of its waters.

Which is the largest tunnel in the world?

The Mt. Cenis Tunnel, or the tunnel of Col de Frejus, by both of which names it is known. It is the longest subterranean route for commerce and travel yet constructed, being 7-1/4 miles in length. It is on the crest of the Cottian Alps, about 16 miles south-west of the summit of Mt. Cenis Pa.s.s. It was begun in 1857, and finished in 1871.

_Col_, a defile.

What other great engineering work can you mention?

The Suez Ca.n.a.l, a s.h.i.+p ca.n.a.l running across the Isthmus of Suez, and connecting the Mediterranean with the Red Sea. The ca.n.a.l is 100 miles in length, and through it an uninterrupted communication is established whereby large sailing vessels and steamers may pa.s.s from sea to sea, and thus avoid the long and dangerous voyage around the Cape of Good Hope.

To whom is the world indebted for this ca.n.a.l?

This great work owes its inception and completion to the enterprise and indomitable energy of Ferdinand de Lesseps, who was born at Versailles, France, on the 19th November, 1805. In January, 1856, he obtained a charter from the Egyptian Government for a company to construct the ca.n.a.l, and began work in 1859. Though beset by many difficulties, the persistent energy of De Lesseps fought its way to success, and in 1869 he had the satisfaction of seeing the waters of the Mediterranean and the Red Sea mingle in the Bitter Lakes. He has since been engaged in many engineering projects, the latest being a ca.n.a.l across the Isthmus of Panama to connect the Atlantic and Pacific oceans.

_Inception_, beginning.

_Indomitable_, not to be subdued.

_Persistent_, inclined to hold firm.

What is a Suspension Bridge?

A bridge supported by wires, ropes, or chains, which usually pa.s.s over high piers or columns at each end, and are secured in the ground below.

Name some of the largest bridges of this kind.

That at Niagara, those over the Allegheny at Pittsburg and the Ohio at Cincinnati, and the great East River bridge, which connects New York and Brooklyn.

Who planned these bridges?

John A. Roebling, who was born at Mulhausen, Prussia, June 12, 1806.

In 1831 he emigrated to this country, and to his genius we are indebted for the bridges above named. The reports, plans, and specifications of the East River bridge were completed, and the work begun, when Roebling was severely injured in the foot while directing his work. Lockjaw succeeding amputation, he died in Brooklyn, July 22, 1869.

To what great Civil Engineer has the West given birth?

James B. Eads. Born at Lawrenceburg, Indiana, May 28, 1820, he began life as a clerk on a Mississippi river steam-boat. In 1842 he entered a firm engaged in recovering sunken property, and with such success that he retired with a fortune in 1857. During the civil war he devised a plan for the defence of the Western waters, and constructed several iron gun-boats with many novel features of his own invention.

He has since acquired reputation as projecting and constructing engineer of the Illinois and St. Louis bridge, and by building jetties at the South Pa.s.s of the Mississippi, by which the depth of the river is increased, and it is made more navigable. These jetties are projecting dikes of brush, fascines, and stone.

_Fascines_, bundles of rods or of small sticks of wood, bound at both ends and at intermediate points, used in filling ditches, etc.

Give the names of some distinguished American inventors.

Eli Whitney, the inventor of the Cotton Gin, born in Westborough, Ma.s.s., 1765; died 1825. Jethro Wood, the inventor of the modern cast-iron plow, born at White Creek, N.Y., 1774; died 1834. Cyrus H.

McCormick, inventor of the mowing machine, born at Walnut Grove, Virginia, in 1809.

Who was the inventor of the Sewing Machine?

Elias Howe. He was born at Spencer, Ma.s.s., July 9, 1819. When a boy he worked in a cotton mill at Lowell, but afterwards entered a machine shop in Boston. Here he conceived the idea of the sewing machine, and after long days of labor, part of which time he and his family lived on the kindness of a friend, he completed his invention. After many struggles, his talent, industry, and perseverance were rewarded, and long before his death, which occurred in October, 1867, he had acquired a large fortune.