. Motion picture electricity. ns and cities. The 2-wire system may be either no or 220 volts, butonly one of these voltages can be obtained from a 2-wiresystem, and it is a well-known fact that for electric light-ing, no volts is more suitable than 220 volts, but wherethere are a large number of motors and where the dis-tance is great the 3-wire 220-volt system may have to beinstalled in order to cut down the expense of copper wirebetween the power house and the place where the currentis used. In order to make a more economical and flexible in-stallation, the 3-wire system is installed, which
. Motion picture electricity. ns and cities. The 2-wire system may be either no or 220 volts, butonly one of these voltages can be obtained from a 2-wiresystem, and it is a well-known fact that for electric light-ing, no volts is more suitable than 220 volts, but wherethere are a large number of motors and where the dis-tance is great the 3-wire 220-volt system may have to beinstalled in order to cut down the expense of copper wirebetween the power house and the place where the currentis used. In order to make a more economical and flexible in-stallation, the 3-wire system is installed, which enablesthe electric company to transmit the power for motorsand lighting on the same wires at half the expense forcopper, and, at the same time, to give you no as well as220-volt current. Fig. 4 illustrates in simplified form the 3-wire are two dynamos or electric generators, A and B,which are connected in series. Both are driven from the 28 MOTION PICTURE ELECTRICITY 3 WIRE SYSTEM110 V. DYNAMO 110 V. DYNAMO. ^ *r INCANDESCENTLAMPS ?* ?K- r^110V- {J ) MOTOR 220
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