Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity (1905)
American School (Chicago, Ill.) · Chicago : American School of Correspondence · leaf 424
88» INSULATORS tor will puncture more readily when it is exposed to severe ineeban-ical stress hy the expansion of the iron pin on which it is mounted. Tests of insulators are usually made with alternating current,and the form of the voltage curve is important, especially wherethe test is made to…
Electrical engineering
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