The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 510
through a 40-ohm relay which closes theline contacts to the plug. etc. At the same time current passesthrough the left-hand contacts of a 350-ohm relay and thebridging 500-ohm inductance coils and through the A and Bwires of the junction line and the operators cord circuit relaysto earth, causing a… … 6 ° ^ c 5= bo bC 482 PRACTICAL TELEPHONE HANDBOOK completes the A wire connection and at the same timeshunts the 12-volt calling lamp by the 40-ohm relay. Whenthe subscriber replies a 50-ohm supervisory relay is actuatedwhich provides a path for battery through the 350-ohm relaywhich attracts its…
Telephone
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
