The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 493
Instrument n ,i , - as neld-magnets for an ohmmeter (shown on left). This, like the DArsonvalgalvanometer, is constructed with a pivoted coil, called thecurrent coil, moving in the gap between the poles of thefield-magnets and an intensifying hollow iron cylinder;but, in addition, a pressure coil… … ELECTRICAL MEASUREMENTS 465 has a gap in it, as shown. A needle attached to the combinedcoils moves over a graduated scale. The current coil is joined directly in the line circuit,while the pressure coil is joined as a shunt. With a highresistance in the line, the latter coil gets nearly all the…
Telephone
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-337-208.webp)
