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Projection Engineering, April, 1930
Page 33
POWER-DELICATELY CONTROLLED BY
Power Rheostats and Potentiometers
Dejur-Amsco power rheostats and potentiometers are engineered mechanically and electrically to fill the exacting requirements of talking movies and other photo sound reproducing systems where the apparatus must be designed to control consistently and unvaryingly the currents in a modulated light and associated circuits.
Give us your ohmic and power specifications between one and two thousand ohms and up to 150 watts, and we shall prepare samples demonstrating the production features of —
Conservative power rating.
Insulation with heat resisting Bakelite and steel
braced asbestos.
Full power dissipation at projection room temperatures.
Self-cleaning, non-microfonic contacts.
Our orders with manufacturers of photo-electric control apparatus recommend a 2 ohms, 75 watts rheostat for modulated light control, and we are prepared to supply these immediately.
Literature and further information on request.
PeTuR-ffMsco Corp.
Fairbanks Building, Broome & Lafayette Sts., New York City
CONDENSERS
"WE SPECIFY POLYMET PARTS BECAUSE WE KNOW THAT QUALITY RADIOS CAN BE MADE ONLY WITH QUALITY PARTS".
StewartWarner Corp.
JUST a flash of what one great radio company thinks of Polymet. Watch the screen for others.
The Polymet Manufacturing Corporation, is today one of the world's largest builders of condensers,resistances, coils and allied products. There is a dependable Polymet Product for every Amplifier, Transformer, Equalizer Network, and Loudspeaker Unit need.
We will gladly supply experimental samples and
^■k work on your] particular problems of Sound
^^^ ^^f Projection.
Polymet Mfs Corp.
839-A East 1 34th St. New York City
Polymet Products
• CUSTOM BUILT . * TURN TABLES *
FOR THE MANUFACTURERS' TRADE
t
XT ERE is a custom built disc iJ supplied at a production price, completely assembled for immediate installation. A masterpiece assembled at a cost unparalleled outside our factory. Made possible by large produc
lyr ACHINED throughout with -'-*-* utmost precision. Gleason Gears, high grade Ball Bearings; quiet, vibrationless. Adaptable to all types of projectors. Spring Suspended Mechanical Filter. Elec. Research or Audak Pick-Ups. Built for enduring satisfaction. Gears supplied any ratio, custom built. Immediate deliveries.
92 MORTIMER ST., ROCHESTER, NEW YORK