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678 MOTION PICTURE PROJECTION
changed thereafter. A change in the location of both or either would seriously interfere with the proper current delivery and commutation of the machine. There is no excuse for altering this adjustment.
PERFORMANCE
On making a test of a double hundred machine it was found that, on starting, the voltage immediately went to about 220 and just as quickly dropped back to 150. This is accomplished by the use of a relay in the panel which inserts resistance into the field as soon as the voltage builds up to the high value. Two things are claimed for this device — protection to the field from abnormally high current and heat, and a saving in power consumption, because of full strength field applied to generators running open circuit. The loss in the shunt field and also the iron losses of the machine would be abnormally high.
With the voltage back at 150 and one of the lamps shorted by its switch, the other arc was started in the usual way. It was found to burn about 100 amperes and at about 60 volts on normal length. The switch across the second arc was then opened, the carbons began to glow, and, when drawn apart, produced a second arc. Both arcs were now burning at about 104 amperes at a total of about 120 volts for the two. On short circuiting the first arc the voltmeter again returned to the neighborhood of 60, while the amperes remained at 100. Allowing this arc to burn without adjustment, watching the voltmeter and ammeter, the current, which was 100 at 60, went to 105 at 70, and 108 at 80, and 109 at 90. Fol