International projectionist (Jan 1961-Dec 1962)

April 30 Target Date forTESMA Report On Theatre Operation Standards The TESMA Theatre Coordinating Survey Committee, headed by Arthur Hatch, Strong Electric Corp. of Toledo, reported this week to the TESMA Board of Directors that his committee had set a target date of April 30th to present its complete report on clarifying standards of operation for theatres. The Hatch committee again met immediately at the conclusion of the TESMA Board of Directors meeting, which took place at the office of V. J. Nolan, National Carbon Co., 270 Park Ave., New York. President Larry Davee, presiding at the Directors' meeting, told the group of his special committee's meeting with Ralph Hetzel, and other executives of the Motion Picture Association of America, and of its tender of advice and assistance in the projected construction of a 1,200 seat pilot theatre in West Africa. He explained that upon the return of Mr. Hetzel from West Africa, where he now is conducting an exploratory mission, the TESMA and How electrical noise is produced . . . calculated . . . measured . . . controlled Here are the basic facts about electrical noise — how it originates in circuits . . . what terms describe it . . . how to measure it . . . how to design circuits to minimize its undesirable effects. The physical nature of the various sources of noise are clearly described, including such sources as thermal agitation or resistance noise . . . shot noise in vacuum tubes and semiconductor junctions . . . noise from spontaneous emission of electromagnetic radiation . . . and noise in gas discharges. This practical book also explains auxiliary mathematical techniques, and discusses the relation of signal and noise in various types of communication systems. For ease in use, the simple tuned circuit associated with a device for measuring average power is made the basic tool for analyzing noise. ELECTRICAL 270 pages, 6x9 105 illustrations $10.00 By WILLIAM R. BENNETT Data Communications Consultant, Bell Telephone Laboratories, Inc. Each chapter in this helpful book begins in a simple, practical manner and works toward more complicated examples. For example, properties of thermal noise and its relation to blackbody radiation are deduced from basic laws of thermodynamics and statistical mechanics. You also will find a clear treatment of elementary quantum mechanics in discussions of the maser and of noise in semiconductors. And, in describing noise properties of various devices, the book fills in your working background with basic facts on junction diodes — transistors — gas discharge tubes— klystrons— traveling wave amplifiers— and others. Both independent and dependent noise sources are analyzed. In addition to the standard theory of noise figure and its significance, a treatment is given of the more comprehensive Haus-Adler theory of noise measure. Throughout, the book stresses the universality of noise-like phenomena. Noise formulas for diodes and transistors; noise generation to meet specifications; design of amplifiers for minimum noise effects— these and many other topics are covered. A comprehensive review of noise in the various methods of signal transmission such as amplitude modulation . . . frequency modulation . . . and the different kinds of pulse modulation is included. CONTENTS 1. General Properties of Noise 2. Thermal Noise 3. Distribution of Magnitudes in Noise Sources 4. Noise in Vacuum Tubes 5. Noise in Semiconductors 6. Noise in Electromagnetic Radiation 7. Noise-generating Equipment 8. Noise Measurements and Techniques 9. Design of Low-noise Equipment 10. Application of Fourier Analysis to Noise Problems 11. Noise in Communication Systems INTERNATIONAL PROJECTIONIST Post Office Box 6174 I Minneapolis 24 Minnesota Please send me a copy of ' Electrica 1 Noise" by William R. Bennett. (1 enclose $10.00.) Name Address City & State ■ MPAA committees again will meet to continue TESMA's offer of aid, including specific recommendations for the projected West African theatre. Enlargement of TESMA's technical aid to theatres in the United States was another facet of the new TESMA program under discussion. It was pointed out that theatre operating standards to be set up by the Hatch committee would, of necessity, be required to originate largely among TESMA members so that the standards thus set up could be adopted by the International Standards Association and thus be a guide for theatre owners all over the world. These standards, when accepted, would be made available to all American theatres, it was emphasized, with their adoption by American theatres to be urged. President Davee reported that he had received expressed approval of the TESMA program being undertaken from producers, exhibitors, film laboratories and concessions people. The Board voted to accept the industry invitation to attend the Eric Johnston Testimonial Dinner, April 10th, and will attend en masse. TESMA members will be asked to communicate with their president, Davee emphasized, so that the Board of Directors could then more closely represent the thinking of the members in its deliberations. Those present at the meeting, V. J. Nolan, National Carbon Co.; George Marchev, Gordo s Corp.; Richard Kneisley, Kneisley Electric Corp.; Arthur Hatch, Strong Electric Corp.; Don Peterson, Bausch & Lomb Optical Co., and Davee, who is president of Century Projector Corp. iP New Arc Lamp Mirrors From Strong Electric Production of a new first-surface dichroic mirror for use in projection arc lamps has been announced by The Strong Electric Corporation, Toledo. These front coated reflectors, which are being marketed under the name of Tufcold are said to afford a longer period of service. The projected light is reflected from the front surface and without passing through the glass twice as with second surface mirrors. Maximum screen illumination is maintained, film buckle is reduced, and focus is improved. There is no emulsion blistering regardless of the power of the arcs. Tufcold reflectors are said to show far less coating deterioration or pitting by ejections from the arc than second surface reflectors. iP 14 International Projectionist March 1961