Robison's Manual of radio telegraphy and telephony for the use of naval electricians (1918)
Robison, S. S. (Samuel Shelburne), b. 1867, United States Naval Institute, Todd, David Wooster, Hooper, Stanford Caldwell · Annapolis, Md. : The United States Naval Institute · leaf 147
m €^ D=ie Fig. 87.—Magnetic Detector—Marconi. 142 MANUAL OF RADIO TELEGRAPHY AND TELEPHONY. Fig. 92 represents circuits of a receiving set complying with presentspecifications. In all such sets closed circuits are calibrated and curvesdrawn or a scale furnished showing wave lengths for all settings… … Fia. 88.—Audion. to 4000 meters, and additional calibrated loading coils for very long wavesare supplied. With very loose coupling the wave length of received signals can thus beread directly. 200. Fig. 89 represents receiving circuits for continuous oscillations;it shows the receiving telephone…
