Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 261
alue of the current wave that defines thecurrent commercially, but the square root of the mean squarevalue, because this gives the equivalent heating effect referredto direct current. There are several types of instrument formeasuring alternating current, and they may be classified as 1,780 HAWKINS… … Fig. L.4y5.—A calibrated scale. This means that printed scales are not employed, but eachinstrument has its scale divisions plotted by actual comparison with standards, after whichthe division lines are inked in by a draughtsman. There are makes of direct currentinstruments employing printed scales…
Electrical engineering
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