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
anges in fre-quency or wave form. They ^s- ^*-are also free from the influence of external fields. They can be calibrated on direct current as wellas on alternating current, which may be an advantage at times. The ammeters have a small range in capacity without a shunt,and are little used for… … Thomson Ammeter with CoverRemoved 177 80 SWITCHBOARDS Commercial Types. A number of types of ammeters and volt-meters are obtainable from several manufacturers, which are builton the inclined coil or iron vane principles. Fig. 47 shows a Thomson in-clined coil instrument in a hori-zontal edgewise…
Electrical engineering
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