The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 629
Fig. 383. Chandelier Switch. 624 STANDARD ElyBCTRICAIy DICTIONARY. Switch, Commutation. A double-pole, double throw switch,arranged to reverse the connections of a pair of wires. It is usedin cases where it is desirable to turn on and off a group of lampsfrom a switch at any one of three or more… … Fig. 384. Commutation Switch. As shown in Fig. 384 the end switches are three wire (two point)switches, the intermediate ones are the commutation switches.The circuit is shown closed. The dotted linesshow the alternative position of the switches.When only two switches are desired, thethree wire…
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