The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 472
Fig. 416.—Skeleton Diagram of Wheatstone Bridge up of a, a known resistance, and r, an adjustable resistance.The battery key b is provided so that the battery may beconnected when required, and the key G (which should be … Fig. 417.—Post Office Pattern of Wheatstone Bridge depressed after the battery key) is used to prevent the disturbance which would otherwise be caused by self-inductioi]when an electro-magnet or ordinary coil was being tested.2* 444 PRACTICAL TELEPHONE HANDBOOK Fig. 417 shows the most convenient…
Telephone
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