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 139
ies themutual induction, as well as the self-induction, and also the couplingand damping, so that the most recent sets—Fessenden (fig. 45), Tele-funken (fig. 46), Lowenstein (fig. 47)—make provision for varying thewave length at some other part of the circuit than at the coupling coil,or, as in the… … Fig. 74 Wave changer. coils, by means of which energy is transferred from the closed to theopen circuit (and vice versa in sets not having quenched or properly air-cooled gaps). The method of building the Telefunken variometer coils, shown infig. 46, is illustrated further in fig. 74. This method…
