Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 378
the battery circuit. The battery key H shouldalways be closed before the galvanometer key K is closed andshould be kept closed until after K is opened. This not only insuressteadiness in all currents when the galvanometer circuit is closed,but also protects the galvanometer from self-induction… … Fig. 51. Standard Double Circuit KeyCourtesy of Leeds and Northrup Company, Philadelphia that the battery and galvanometer branches will be closed andopened in the proper sequence. A reflecting galvanometer is usedfor accurate measurement. In making a measurement of an unknown resistance it is…
Electrical engineering
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