The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 486
ing material, causingit to offer a greater and greater resistance to leakage, shown bya steady fall in the deflection. This fall is an evidence of goodinsulation, and is one of the principal points to be observed. After the one minutes electrification the deflection isobserved, and multiplied by… … Fig. 433.—Connections for Insulation Resistance Test megohms, and the deflection 560° (allowing for shunt), then 50 000 = 893 megohms, is the absolute insulation resist- ance. The insulation resistance per mile, which is ofeven more importance, will be obtained by multiplying theabsolute insulation…
Telephone
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