Name/Title
StereographEntry/Object ID
2023.055.3.0159Description
A black and white stereograph. Image is of submarines being repaired in a dry dock. Above the image "W210 (Star)" is printed, below the image "19004 Four of Our Submarines in Dry Dock in Govenrmtne Navy Yard." is printed, to the left of the image "Keystone View Company Copyrighted, Manufacturers MADE IN U.S.A. Publishers" is printed, to the right of the image "Meadville, Pa., New York, N. Y., Chicago, Ill., London, England." is printed. On the reverse the following is printed:
19004 SUBMARINES IN DRY DOCK IN GOVERNMENT NAVY YARD
John P. Holland, a resident of Paterson, New Jersey, an Irishman by birth, built the first practical submarine. The submarines of all navies now follow the Holland idea, but of course on much improved lines. Th United States, after entering the late war, had 75 submarines, with more in process of construction. One of the finest of these was the "Schley," 263 ft. 9 in. long, with a surface displacement of 1250 tons, a submerged speed of 11 1/2 knots, a surface speed of 20 knotss, a crusing radius of 3,000 miles and a powerful armament of 8 torpedo tubes. A submarine has two sets of engines. Oil engines propel it ion the surface and run dynamos which generate electicity for large storage batteries. Elecrtic engines propel the boat under water. It is submerghed by letting the ocean water flow into tanks and rises to the surface by emptying the tanks by forcing in compressed air. When submerged it runs along under the surface of the water at a depth of from a few feet to 100 or more. If too close to the surface it may be easiily detected by an airplane.
The periscope, the "eye of the submarine," is a bronze tube about 4 inches in diameter and 15 or 20 feet long, fitted with reflecting prisms and magnifying lenses so that the observer in the submarine can see on the surface of the water. Some of the later and improved submarines built by Germany had 3 or 4 periscopes. The submarine mainteains its equilibrium by the use of a gyroscope, by horizontal rudders, and by quickly shiftning the water ballast. Two of the horizontal rudders or stabilizers may be seen on the submarine in the immediate foreground. When submerged the crew breath air from oxygen tanks. A supply sufficient for 36 hours can be carried.
Copyright by The Keystone View CompanyCollection
Photograph Collection