Exhibitors Herald World (Oct-Dec 1929)

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November 30, 1929 EXHIBITORS HERALD-WORLD 33 SOUND PICTURES Question No. 31. — With what does the ring-shape conductor in the center of the photo-electric cell connect? With what does the light sensitive material deposited on the interior of the photo-electric cell bulb connect? With what is the space in the photo-electric cell bulb filled and what is the purpose of the filler? Question No. 32. — Upon what does the condenser (Note: Condenser as here used means an electrical condenser, not the glass sort used in the optical system) depend for its action? Ju9t what purpose does the condenser serve? Name one purpose served by the condenser. What does the electrical condenser represent? New Questions and an Answer to QUESTION NO. 28 The Blue Book School ANSWER TO QUESTION NO. 28 — The question was : "Tell us just what the photo-electric cell does and name its principal elements, naming the positive and negative elements." THE replies were numerous, but not so many of them were acceptable. Those had been sent by W. C. Budge, Frank Dudiak, Dallas, Tex., Frank Beritiwitz, Harlan B. Fox, R. L. Dubois, William Clausner Thomas Lithron, J. L. Hicks, Robert Singleton, Harlan B. Fox, A. D. Henley, F. D. Fleming, F. T. Spencer, Stuart Klien, H. M. Johnson, B. Flemming, John Furman, G. L. Doe, "Bill" Doe, A. T. Hancock, George Rand, L. Styles, John T. Anderson, T. R. Abernathy, T. True and G. H. Norman. Incidentally Frank Dudiak, G. T. Badly, William Truax and William Dubois sent acceptable, though late answers to Question No. 26. Please try to get your answers in as early as you can, men. It is a big job just to go through them. Takes hours each week. I have elected the reply of G. L. Doe, Chicago, as best suited for publication. It is as follows : "In reproducing and projecting sound impressed upon motion picture film photographically, the photo-electric cell receives the rays of light from the slit after they have passed through the film sound track. These rays are incident upon the light sensitive material which forms: the interior coating of the cell. By F. H. RICHARDSON An Award for Better Reproduction MR. EXHIBITOR: Is your reproduction of sound meeting the standards necessary to bring new patrons into your theatre and, once there, to keep them? That is one of the big problems facing the industry today. The HeraldWorld campaign for better reproduction, announced last week, with a bronze plaque to be awarded to the theatres having sound reproduction of merit, has won industry-wide support. For further details see Page 13 "This material is charged with the negative voltage from a 90 volt storage battery. A round anode located in the center of the cell is charged by the positive side of the same battery. A gas which is an electrical conductor in proportion to the amount of light incident upon the light sensitive material during any minute fraction of time, permits current to flow from the round, central anode to the silver cathode upon which the light sensitive material is deposited, which same connects to the amplifier, so that by the action of these elements an electric current is set up which must and does vary in power exactly as the light entering the cell varies in power, strength or brilliancy. ♦ ♦ ♦ "The photo-electric cell therefore transforms light into electric current of exactly even value, when considered through a period of time. "The impulses or current sent out by the photo-electric cell are so enormously weak that they must be and are amplified enormously before they reach and operate the horns or loud speakers. The amount of amplification has been variously stated at from 20,000 to 200,000 millions of times. The Bluebook states it at 100,000 million, which seems to be the selection of a reasonable medium from many pretty wild statements. Just what the exact amplification is I personally am inclined to doubt that any one really quite knows." My compliments to G. L. Doe of Chicago. That is, I believe, about as excellent an answer as has been made to any question in this series to date. It is too bad that Doe does not give us his right name. The Difference Between FAILURE AND SUCCESS Is Doing Things NEARLY RIGHT and Doing Them EXACTLY RIGHT