Electric transmission of energy and its transformation, subdivision, and distribution. A practical handbook (1894)
Kapp, Gisbert, 1852-1922 · New York, Van Nostrand · leaf 361
The coils form- 342 ELECTRIC TRANSMISSION OF ENERGY. ing one pair are cross connected as before, thus leavingsix free terminals. Three of these are connected togetherby the wire o9 and the three others, marked a b c, areconnected with the three line wires. It is easily seenthat with this… … precisely the same as with three totally independentcircuits. The reason is, that the sum of the currents,a + b + c, must at all times be zero, and that by bunchingthe three return wires into one, this latter would have tocarry zero current, and may therefore be omitted alto-gether. The common…
Electric power production
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