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 398
tesy of James G. Biddle, Philadelphia through six concentric arcs placed equally distant from each other,Fig. 66. This arrangement permits the position of the pointer to beread directly to .1 of a scale division. 359 64 ELECTRICAL MEASUREMENTS The instruments selected as secondary standards for… … Fig. 63. Type of Scale Used in Precision InstrumentsCourtesy of Weston Electric Instrument Conipa?iy direct- and alternating-current measurements, so they can be checkedagainst the primary standards on direct current and used for thechecking and calibration of portable alternating-current…
Electrical engineering
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