'The development of the torpedo as a weapon of defence, and the important part it seemed likely to occupy in any future naval war, led Mr. J. S. White to consider a means for obtaining increased manoeuvring powers in his boats, this being one of the important factors in the problem of using torpedoes with the greatest effect. The result was that about three years ago a boat was produced on what is known as the "double-rudder system with after deadwood removed." The first vessel built on this principle was a 42 ft. pinnace, which was purchased by the Government after completion, and formed part of the boat equipment of the Inflexible when she was commissioned by Captain Fisher.'