Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 74
B X (Cof the unknown resistance. A) will give the value Ques. Why should the battery key be depressed beforethe galvanometer key. Ans. To avoid the sudden swing of the galvanometer needle,which occurs on closing circuit in consequence of self-induction. TESTING AND TESTING APPARATUS 493 Ques. How… … Fig. 569.—Method of reversing arms of Wheatstone bridge with reversing blocks. The arrange-ment shown in the figure is •classical, being that used in the English post office type ofWheatstone bridge. It is open to the objections which apply to the use of several plugs,one of which is withdrawn to…
Electrical engineering
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
