1 Understanding a Photosynthesis Diagram Photosynthesis is a process by which plants convert the radiant energy of sunlight into chemical energy that can be used by themselves to power their lives. 2  A diagram of photâ¦.
U-Boat Crew. The crew numbers aboard a U-boat varied greatly between different U-boat types and the mission it was undertaking. A Type II U-boat comprised of 25 officers and seamen, while a Type VII housed approximately 45. A Type IX had about 50 and Type XXI had a 57 man crew. Sometimes U-boats carried specialist crews on special missions, such as scientists, spies or commandos.
The 22-foot-long, hand-cranked submarine was bought from its inventor Oliver Halstead. She was sea tested in 1872, but because of repeated failures, the Navy refused to commission the vessel. USS Holland (SS-1), the U.S. Navy's first commissioned submarine. An American inventor, John P. Holland, built his first steam-powered submarine in 1875. The US Navy purchased his sixth submarine on April 11, 1900, for $160,000. The 53.3-foot-long, 63-ton submarine could travel to a depth of 75 feet. It was commissioned October 12, 1900, as the USS Holland (SS-1). On the surface, the Holland was propelled by a 45-horsepower engine and could go six knots. Below the surface, the submarine relied on electric storage batteries. Holland's submarine, which held six crew, carried three torpedoes and a topside gun.