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
Fig. 208. ALTERNATING CURRENTS. 1395 The four-wire system of distribution is shown in Fig. 210. The twophases are entirely independent, and for lighting purposes may be operatedas two single-phase circuits. … g^txro; (S^^QQQQa Fig. 209. Fig. 210. 2. Three-phase Currents.—Three-phase currents consist of three alter-nating currents, differing in phase by 120°, and represented by three sinecurves, as in Fig. 211. They may be distributed by three or six wires. Ifdistributed by the six-wire system, it is…
Mechanical engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-156-95.webp)
