The motion picture projectionist (Nov 1931-Jan 1933)

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Motion Picture Projectionist November, 1931 THEY KEEP ARUNNING ROTH ACTODECTORS ROTH ACTODECTOR CONTROL PANEL 20/40 to 100/200 Ampere 2-Bearing Actodector ECONOMY OF OPERATION 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. ROTH Emergency Lighting Plants are giving thoroughly dependable protection in many of the largest circuit and independent theatres. ROTH BROTHERS AND CO. Division of Century Electric Company 1400 W. Adams St. Chicago, III. Distributors and Offices in all Principal Cities MOTOR GENERATOR SETS AND ROTARY CONVERTERS