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Oamaru Mail, Volume XL, Issue 12538, 8 May 1915, Page 4 (Supplement)

The belligerent nations (according to Renter's New York correspondent) are much interested in the recent invention by a young American of a'torpedo which, according to its maker, is more effective than any other ever used. By means of a magnetic . electrical device, which is affected by any great mass of metal, the rudders guiding the torpedo are also affected in such a way that it- will steer in that direction. So sensitive is this device that if the missile be discharged at a ship at a range of two or three or even five miles, which is far beyond the range of torpedoes now in use, that ship is doomed. The torpedo has two arms of nickel silver attached to either side, projecting at right angles. .At the ends of these arms are wire magnetic coils, about 4in in diameter. Upon these magnetic coils hinges the success of the topedo. A high frequency current- passes through them, and the presence of any great mass of metal changes the self-induction which affects, the electrical relays, and these in turn operate the motor controlling the rudder. '.. So the torpedo will follow its target, and will steer for it no matter how often the target may change its course or position.