'The torpedo developed by Savage and Halpine was a copper cylinder two feet in diameter and 17 feet long, tapering to a point at both ends. A small battery-powered motor in the torpedo drove it at a speed of about ten knots, depending upon the power of batteries. Red and green lights atop two short masts could be flashed periodically in order to enable the operator to determine the location and course of the torpedo. The torpedo carried a shell loaded with 40 pounds of explosives, which would be ejected forward from the torpedo by a spring. The shell, powered by a rocket propellent, would dive under the torpedo net, and then rise up to strike the hull of the ship. Meanwhile, the torpedo would back away after ejecting the shell. Savage demonstrated the torpedo to the press in 1889 at Bay Ridge, Long Island. Controlling the torpedo from the shore by the attached electrical wire, Savage sent it out from the shore in an arc toward a dock several hundred feet away. Savage stopped the torpedo at a simulated torpedo net, discharged the 4-foot shell under the net, and then backed the torpedo away from the net and returned it to shore.' See the attached correspondence from Edwyn Gray regarding the importance of this particular invention.