Radio Control
the guiding or directing of distant objects such as ships, torpedoes, or aeroplanes by means of wireless operations. The first attempts to guide unmanned ships were by means of magnetic forces established in the neighborhood of electrified submarine
Such experiments were made even prior to 1914 and were further decables. veloped in the course of the World War, when a German boat driven by gasoline engines was successfully piloted along a cable and so directed against a French pier by means of remotely controlled devices attached to the engines and rudder. Seven distinct controls were provided for. At the end of the war the progress of invention had reached the point where torpedoes and ships could be rudder. Seven distinct controls were pro- vided for. At the end of the war the progress of invention had reached the tions or from aeroplanes; while the guidof aeroplanes themselves from ance ground stations situated within the zones of safety had equally been accomplished, thus leading to plans for the bombing of distant enemy posts and cities by planes requiring no aviators. In the navy bombing tests off the Virginia capes, made in June, 1921, the former battleship Iowa of thus leading to plans for the bombing of distant enemy posts and cities by planes requiring no aviators. In the navy bomb- ing tests off the Virginia capes, made in maneuvered, moving at a speed of from four to six knots an hour while airplanes attempted to drop bombs upon her. For radio control of instruments to enable ship pilots or aviators to maintain their courses through fogs, etc., see DIRECTION FINDER OF RADIO COMPASS.
RADIO TELEPHONY.
LESS TELEPHONY.)