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2-kilowatt quenched spark 300 kilocycles aerial navigation angle antenna circuit found antenna hung apparatus apparent shift bisector Bureau of Standards coil BM coils were oriented connection shown crossed-coil antenna Crossed-Coil Transmitting Set current distribution d. p. d. t. switch Dayton direction of flight Directive Radio Beacon distance double-coil antenna emitted wave Engel 1 Dunmore equal intensity equal signals equisignal transmission equisignal zone gradually became equal ground tests km 100 miles Lighthouses line of equal loops magnetic compass Mathias Point maximum of coil McCook Field method P. D. Lowell quenched spark transmitting Radio Direction Finder receive signals receiving set located ship or airplane short trailing wire shown in Figure Signal Corps signal from BM signals from coil signals gradually became signals of unequal signals received signals were equal single-turn coil antennas south the signals spark transmitting set straight course transmitting coil antennas transmitting station truck wind drift zone displacement