This was a special electrical generator used for running projectors in 1920's.
"Roth Multiple Arc Actodector Generators are designed by scientific proportioning to operate at an exceptionally low voltage. This reduces loss in ballast resistors, field and armature. Laminations are of non-ageing and low loss silicon steel. The frame is rolled steel. These features increase efficiency.
Continuous, brilliant screen illumination of uniform intensity is assured, even during change-over. Any number of arcs can be carried within the ampere ratings of Roth Multiple Arc Type Actodectors. They are especially desireable in connection with sound projection equipment. The sizes range from 20 to 600 amperes . . . Furnished in 2- and 4-bearing types."
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