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 94
epend upon the action of a coil car-rying the current to be measured, upon one or more pieces of soft iron.Such instruments are also called moving-iron, soft-iron, andmagnetic-vane types. Instruments of this general type have beenused for many years, the earlier ones having been constructed… … Fig. 72. Diagram of Essentials ofElectrostatic Ground Detector 77 68 ALTERNATING-CURRENT MACHINERY sometimes referred to as the plunger type, was faulty, and hasbeen since superseded by the modern designs which involve the
Electrical engineering
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