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increases because in the case of this characteristic curve, as the current decreases from 55 amperes, the voltage of the generator rises quite rapidly. However, the current delivered by the generator will increase only to a certain value as the voltage decreases and from there on the current begins to decrease as the generator voltage decreases. Therefore, this machine will operate stably with the arc in its circuit. Of course, it is understood that a generator having characteristics as illustrated by this curve CD on Figure No. 7 could only be used for one arc lamp. For modern service where two arc lamps are used, alternately, and transition is made from one reel of pictures to the other, requiring both lamps to operate simultaneously during the transition period, the generator must be designed for higher voltages as illustrated by Figure No. 8, so that with one lamp in operation, the generator will be operating at a point on the curve illustrated at A, which represents a 55 volt, 55 ampere arc and at B where two such arcs are connected in series, each taking 55 .amperes, but the two in series requiring 110 volts total from the generator.
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Dr. H. P. Gage: Have you ever tried to make a machine like that, to see if it would work successfully?
Mr. Candy: Yes, we have built a machine of that type. However, these machines are subject to certain criticisms as follows: When the first arc is struck, it is necessary to bring the carbons together quickly and separate them quickly, otherwise the generator voltage will be reduced to a very low value and the arc cannot be struck. When the second arc is struck, the carbons must be separated very slowly so that the circuit will not be broken. If the arc is broken in the second lamp, the first lamp is also robbed of its current because the two arcs are in series. On the other hand, with the constant potential generator, such as we have been discussing, the two arcs are operated in parallel circuits and if one arc is broken, the other arc will continue to burn.
Mr. Richardson : There is a great deal of harm done by people by putting out instructions to operate with a certain amperage and a
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