The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 483
ot required. By proper manipulation ofthis key the readings of the deflections can be very quicklytaken, and much time saved, one reason for this being theelimination of the throw of the needle, caused bythe capacity of the wireunder test when the bat-tery connection is firstmade. Universal Shunt.… … Fig. 430.—Universal Shunt Box ELECTRICAL MEASUREMENTS 455 Ayrton & Mather, which has the advantage that it can beused with any galvanometer. Fig. 430 shows a rotaryswitch form, and Fig. 431the plan and connectionsof a peg switch form of theinstrument. G is the gal-vanometer, and r a resist-ance…
Telephone
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