Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 684
atthe station called is returned to the home button. This system includes apiece of apparatus at each station that has not been required in any of thesystems previously described, to-wit: the impedance coil E. Where acommon battery supplies all the local microphone circuits with current insystems… … Fig. 50. Common Battery System with Impedance Coils. The cross talk is due to the variation in the fall of potential along thebattery and common return wires. The cross talk may be greatly reduced by using batteries of very low in-ternal resistance, such as storage cells, and making the common…
Electrical engineering
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