Frequency Hopping The Patent Wiring Diagrams

Patented Aug. 11, 1942	2,292,387		1 21
UNITED   STATES   PATENT   OFFICE 2,292,387 SECRET COMMUNICATION SYSTEM Hedy Kiesler Markey, Los Angeles, and George Antheil, Manhattan Beach, Cakif. Application June 10, 1941, Serial No. 397,412 6 Claims.   (Cl. 250-2)
This invention relates broadly to secret communication systems involving the use of carrier waves of different frequencies, and is especially useful in the remote control of dirigible craft, such as torpedoes. An object of the invention is to provide a method of secret communication which is relatively simple and reliable in operation, but at the same time is difficult to discover or decipher.