Projection engineering (Sept 1929-Nov 1930)

Record Details:

Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.

Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.

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