Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 320
maximum scaledeflection. The appearanceof switchboard voltmetersand ammeters is shown inFig. 201. F^s- 20I- Another type of volt- meter, depending for its operation on the attraction betweentwo electrically charged bodies, is the electrostatic volt-meter. Low-voltage instruments of this type… … CJtNTRAL-STATION EQUIPMENT. 309 resistance is connected in series with the instruments, suchresistances being known as mtdtipliers. If R be the resist-ance of a low-reading voltmeter, and r be that of the multi-plier, then the range of the instrument has been increasedr+ R R times. Multipliers…
Electric machinery
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