. Electrical world. nts taken withdifferent instruments. The fact that only a portion of the scale isaccurately legible and that it is not always possible to have at handinstruments of the proper range to cover all capacities properly, makeit at times impossible to avoid the use of comparatively illegibledivisions, and as a result the curve sheets of tests and tables ofmeasurements show irregularities which rob the work of all value. To obviate such troubles and the other embarrassments resultingfrom the use of imperfect standards, the Department of Standards of the Westinghouse Electric & Man
. Electrical world. nts taken withdifferent instruments. The fact that only a portion of the scale isaccurately legible and that it is not always possible to have at handinstruments of the proper range to cover all capacities properly, makeit at times impossible to avoid the use of comparatively illegibledivisions, and as a result the curve sheets of tests and tables ofmeasurements show irregularities which rob the work of all value. To obviate such troubles and the other embarrassments resultingfrom the use of imperfect standards, the Department of Standards of the Westinghouse Electric & Manufacturing Company has de-signed the portable instruments illustrated herewith. The assort-ment comprises voltmeters, ammeters and single-phase and polyphasewattmeters. Their principal characteristics are convenience in use,permanence of calibration, accuracy and mechanical excellence. As shown by the illustration, the voltmeter is zero-reading, thisform having been found most suitable for measurements for which. PORT.\ELE VOLTMETER. a voltmeter is used. In this form the readings are determined bythe deflection of the milled head required to bring the index pointerto zero. Each instrument is made in two capacities, which in con-nection with the very long, open scale enables the readings to be
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
