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.
82 Transactions of S.M.P.E., Vol. XIIl, No. 37, 1929
Fire Protectioyi. A patent has been granted for a device which directs a blast of moist, oil-free, cool air on the gate of a motion picture projector/^^ The characteristics of heat absorbing glasses have been described. ^^^ A description has been published of the projection rooms in the Paramount Theatre, New York City, with especial reference to the precautions for fire prevention. ^^^ A survey of the causes of projection room fires in a large city during one year provides valuable information for the projectionist. ^^^ A fire extinguisher has been so mounted on a projector that it puts the fire out almost instantly and cuts off the electric current to the projector.^^^ Another automatic apparatus closes the light circuit and stops the projector whenever the path of the film becomes slightly changed.^^^ Valuable hints on installation of projection room equipment have been given which if adopted are claimed to permit a 50 per cent reduction in insurance costs/^® Data have been published showing the time required to quench burning celluloid with water.^^° A few patents have been issued pertaining to the design of projection apparatus to minimize fire hazards.^^^
Effect Projection and Stage Illumination. Effect projectors enable very beautiful scenic designs to be created for stage presentation. A simple apparatus for the embellishment of titles has been described. ^^^ A twin lamphouse universal effect projector makes possible more complex and unusual design effects.^^^ Projection on very large gauze drops has been used effectively at the Eastman Theatre for prologue acts as well as the occasional use of very large screens filling the entire proscenium arch.^^* The importance of complete co-ordination of light and music is stressed by Powell, who describes installations for creating certain color effects.^^^ Three articles have appeared giving descriptions of a number of new devices for stage lighting. ^^® Landau suggests the introduction of ''color music" by choosing twelve colors corresponding to twelve tones in an octave. ^^^ Kann has patented the lateral projection of images for decorative purposes in theatres. ^^^
Projector Lenses and Shutters. Hauser and Mohr^^^ have reviewed the optical paths and objective requirements in motion picture projectors. A general survey of modern lens design with special emphasis on projection lenses has been published by Lee.^^^ Several new types of projection lenses have been described. ^^^
A silvered plate of optically clear quartz on which a network