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 197
mally with its planeparallel to the lines of the field of the permanent magnets. Whencurrent passes through the coil, it tends to turn so that it stands atright angles to the lines of the field. This tendency is opposed bysprings. Damping is furnished by winding the coil on an aluminum 173 76… … Fig. 44. Flush Type Direct-Current VoltmeterCourtesy of Weston Electrical Instrument Company permanent magnets, they show polarity by reversing with change in polarity. They require heavy shielding to prevent errors due to stray fields. Thomson Astatic Type. The Thomson astatic instruments are…
Electrical engineering
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