John Whitehurst is credited with the idea of the Hydraulic Ram in 1772, though it did not become a practical machine until the French inventor Joseph Montgolfier made an automatic RAM in 1796. James Easton purchased Montgolfier's patent and the hydraulic RAM businesss of Whitehurst in the 1800's and introducted the machine to England. In 1929 Green & Carter acquired the patentand Easton's business and have been manufacturing and installing the Vulcan and Vacher RAMS since.[1](The Mongolfier brothers of France in 1796 are better remembered for their pioneering work with hot-air balloons). [1]
[edit]Theory