International projectionist (Jan-Dec 1936)

©C1B 311121 August 1936 £UG 31 13 36 INTERNATIONAL PROJECTIONIST f/nfer/nvfio/na// ROJECTH With Which is Combined PROJECTION ENGINEERING Edited by James J. Finn Volume 11 " AUGUST 1936 Number 2 [ndex and Monthly Chat .... 5 Maintenance Problems of the High-Intensity Arc 7 A. C. SCHROEDER Color in Motion Pictures Held Distracting 8 What About ,16 mm. Projection? 11 James J. Finn Step-By-Step Analysis of Sound Reproducing Equipment XX 12 Aaron Nadell Letters to the Editor 17 'Regular' Simplex Off Market; Replaced by 'Super' Head . . 18 Uniform National Projection Laws Proposed by Leading Craftsmen 19 The W. E. 86-Type Amplifier. . 20 V. M. Cousins Mass. Bans Doubles; Anomolous Union Situation; Projection Problems 22 The Editorial Page 23 The Keller-Dorian, Three-Color Motion Picture Process .... 24 William E. Celestin RCA to Service 300 ErpiEquipped Theatres; Erpi's Competitive Service, New Reproducer 25 News of the Month 26 News Notes Technical Hints Miscellaneous Items Published Monthly by JAMES J. FINN PUBLISHING CORPORATION 580 FIFTH AVENUE, NEW YORK, N. Y. Circulation Manager, Ruth Entracht Subscription Representatives Australia: McGills, 183 Elizabeth St., Melbourne New Zealand: Te Aro Book Depot, Ltd., 64 Courtenay Place Wellington England and Dominions: fm. Dawson & Sons, Ltd., Pilgrim St., London, E. C. 4. Yearly Subscription: United States and possessions, $2 (two years, $3) ; Canada and foreign countries, $2.50. Single copies, 25 cents. Changes of address should be submitted two weeks in advance of publication date to insure receipt of current issue. Entered as second-class matter February 8, 1932, at the Post Office at New York, N. Y. under the act of March 3, 1879^^ Contents copyrighted ^1936 by James J. Finn Publishing Corp. ■ International Projectionist is not responsible for personal opinions appearing in signed articles in its columns. MONTHLY CHAT GREAT gobs of information for I titalert projectionist in I his issue: A new Erpi amplifier using the new 300A power tube described herein last month; the first circuit analysis of the SimplexAcme sound system; data on the projection requisites of the Keller-Dorian 3color process; a timely warning on 16 mm. film equipment operation; more about Suprex arc magnification ratio — these and many other topics are covered. It's funny: a new Erpi tube in the last issue, and now a new amplifier using that tube. Not deliberate, so help us, but it proves again that consistency is a jewel. The feller without last month's I. P. will be at a disadvantage in absorbing the amplifier dope this month. SEPT. 1 is here and still unsolved is the great mystery of the new standard double reel. More about this engrossing subject herein. THEATRE sound system servicing takes still another twist, with the electrics closing deals with major circuits for 100, 200, and 300 theatres at a clip on a single contract. We have a vague recollection of having dealt with this topic sometime during 1935, but we can't be sure until we consult our files. Oh, yes, we remember now. The story went something like this — "Once there was a projectionist organization . . ." COMING soon — a detailed description of the entire RCA High Fidelity reproducing equipment demonstrated at the I. A. Convention in Kansas City and which sent the boys out of the demonstration hall talking to themselves. From speakers to projector optical system complete, with no detours. For good measure there will be thrown in explicit data on RCA's UltraViolet Recording. WHAT, asks a perplexed projectionist, would we suggest that he say before a local Chamber of Commerce which invited him to "explain" the projection process "in fifteen minutes." Well, we answered, tell them all about decibels, and dynes, and microamperes, and secondary emission, and lens speed, and photocells and a few dozen other things about which they now know nothing and will know less after the talk. These Commerce boys are out for a meal, not for education, and they want fancy, not fact, with their soup and crullers. That which they don't understand they appreciate all the more. ANEW show season is almost here. Have you braced the boss for a new screen, a projector overhaul, new reflectors, improved room ventilation, a new lamp, ample spare tubes, photocells and exciter lamps or any of those things that make for a better job all around. j If you've alreadv tried and failed, give it another whack. The boss might be • gin to think you mean it.