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 353
mon in many direct-current instruments, are eliminatedand absolute permanence may be relied upon. The effects of external fields are eliminated by the astaticarrangement of the fields and moving parts. A field which tends toincrease the torque on one side of the armature diminishes it to… … Fig. 23. Courtesy of General Electric Company Thomson Astatic Ammeter, CoverRemoved ELECTROMAGNETIC INSTRUMENTS Principle of Action. If we take the elements of a galvanom-eter, with the coil carrying the current fixed, and substitute, inplace of the suspension magnet, some soft iron which is free…
Electrical engineering
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