The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 495
TELEPHONE HANDBOOK much importance that it is necessary to be able to practicallymeasure the actual inductance of apparatus and lines. For the testing of coils the simplest method is by means ola Wheatstone bridge, and a variable standard inductance, suchas that of Professors Ayrton and Perry,… … Fig. 443.—Ayrton and Perrys Variable Standard Inductance between 4 and 40 milli-henrys by turning the inner coil, apointer and scale at the top showing the amount. Fig. 444 shows a smaller and cheaper form of instrument forthe same purpose, registering between 5 and 25 millihenrys.Both these…
Telephone
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