The mechanical engineer's pocket-book. A reference-book of rules, tables, data, and formulæ, for the use of engineers, mechanics, and students (1910)
Kent, William, 1851-1918 · New York, J. Wiley & sons · leaf 1444
s.—The power of two-phase currents distributed by four wiresmay be measured by two wattmeters introduced into the circuit as shownin Fig. 210. The sum of the readings of the two instruments is the totalpower. If but one wattmeter is available, it should be introduced first inone circuit, and then… … Fig. 213. 1396 ELECTRICAL ENGINEERING. The power of two-phase currents distributed by three wires may oemeasured by two wattmeters as shown in Fig. 209. The sum of the tworeadings is the total power. If but one wattmeter is available, the coarse-wire coil should be connected in series with the wire…
Mechanical engineering
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