Amateur radio : how and why of wireless with complete instructions on operation of receiving outfits (1922)
Grainger, Maurice J · New York : James A. McCann · leaf 56
TWI5TEDTAP \l 6Q9P4 … TELLPHONL Rf£IIV£P^ Fig. 9 36 AMATEUR RADIO The crystal detector may be made up of atested crystal, three wood screws, short pieceof copper wire, a nail, set-screw type of bind-ing post, and a wood knob or cork. Thetested crystal is held in position on the woodbase by three brass wood-screws as…
Radio · Amateur radio stations
Internet Archive · University of Connecticut Library · Public Domain Mark 1.0. Free to use for anything.
