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 200
perate on the induction principle. These instrumentsare similar to the induction watt-hour meters. A metal disk isplaced within the influence of two fields set up by alternating currentflowing in coils. Current is induced in the disk, and the reactionbetween this and the fields causes the disk to… … Fig. 47. Thomson Inclined Coil AmmeterCourtesy of General Electric Company Any of the instruments built on other principles can also bebuilt on this principle. The chief advantage of these instrumentsis that they have very long open scales. They are usually maderound pattern and then have scales…
Electrical engineering
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