Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1334
n ampere meter. This is called Calibration. Ammeters and Voltmeters.—The ammeters and volt-meters of commercial work are all special adaptations ofthe DArsonval galvanometer or, for the least accurate worksuch as on switchboards; they are of the magnetic vane type. The Weston instruments are… … Fig. 609interior of weston instrument 1306 Steam Engineering the whole of the working part is. built up on this mag-net independent of the ease, so that the movement canbe removed bodily from the case by simply taking outone screw which holds the gun-metal casting in place.The inside polar faces of…
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