The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 505
divisions, and the same strength in direct current will give adeflection of 150 divisions. For measuring alternating current theinstrument is set up as shown, the potential divider is then rotateduntil the galvanometer is at zero, and then the alternating currentsconnected to the line terminals… … A5m.t I 32± Fig. 4486.—Connections of Cohens Barretter Set gether form a bridge instrument which when operated by an alternat-ing current enables the impedance of instruments, lines, etc., con-nected at a to be balanced by resistances connected to b,, or viceversa. Both these instruments are made…
Telephone
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