George C. Cannon, An Amateur Station (1916)
“ These. loaders in no way effect sensitiveness of coupler when switches are in neutral position. Telephone switch, middle near bottom, throws wave mater into circuit on audion, waves up to 3,000 meters, receiving, measurable. This switch also prevents loss of sensitiveness when in neutral position. Aerial switch of special construction breaks both aerial and ground circuits when transmitting, preventing any POSSIBLE trouble with receiver, also starts and stops rotary, one movement, one wire common to bath transformer and motor of rotary. ”
