The breed society for the Welsh breeds has four sections, primarily distinguished by height, but also by variations in type: the Welsh Mountain Pony (Section A), the Welsh Pony (Section B), the Welsh Pony of Cob Type (Section C), and the Welsh Cob (Section D). Section D Welsh Cob pulling a carriage. The Welsh Cob (Section D) is the largest size within the Welsh Pony and Cob breed registries. They must be taller than 13.2 hands (54 inches, 137 cm), with no upper height limit. They are used as riding animals for both adults and children, and are also used for driving.
Today, we invent the submarine, against all odds. The University of Houston's College of Engineering presents this series about the machines that make our civilization run, and the people whose ingenuity created them. Bushnell's Turtle was the first submarine used in war. His one-man, hand-cranked machine did little harm to the English in 1776, but it made the point. One person who got the point was Robert Fulton. Years later, he made a submarine for the French and tried without success to sink the enemy with it.
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.