acReceiver I * Arrangement Of Hummer Circuit When Receiver lAr0n Hook. IT- Wiring Diagram Of Talking Circuit When Receiver Is Of f Hook. Flg. 252. a Diagram of the various circuits in the police-signal box with the receiver hook up and downanbsp;...
|Title||:||Practical electric illumination and signal-wiring methods|
|Author||:||Terrell Croft, George Henry Hall|