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.
Submarines were first built by Dutch inventor Cornelius van Drebel in the early 17th century, but it was not until 150 years later that they were first used in naval combat.