Projection engineering (Jan-Dec 1931)

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HOME, PORTABLE OR THEATER TALKIE PROJECTORS give finest results with CLAROSTAT CONTROLS Speed Controls Clarostat Compression type Rheostat gives micrometric control of speed. Has been adopted as standard equipment by some of the largest manufacturers of portable projectors. Made in various resistance ranges from 10 ohms up to 10 megohms, and in five sizes up to 250 watts. Volume Controls Clarostat Volume Controls are absolutely quiet, long lived units, with special alloy contactor and windings to avoid thermal e.m.f. Made in simple potentiometer or dual and triple units for constant impedance work to meet exacting needs of sound industry. Insulated or grounded shaft and bushing, as desired. New model Graphite Element Potentiometers for use where extra high resistances are required. These have the revolutionary Geared Roller Contact for long life and silent operation. Clarostat Mfg. Co., Inc. 285 N. 6th Street, Brooklyn, N. Y.