International projectionist (Jan 1963-June 1965)

HEYER-SHULTZ UNBREAKABLE METAL REFLECTORS TOP SCREEN ILLUMINATION WILL NOT PIT OR TARNISH 5 YEAR GUARANTEE FACTORY REFINISHING SERVICE S«e TOUr Manufactured by TAeOfre Supp/y Deafer HEYER-SHULTZ, IllC. Cetfar Grove, N. J. 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 illustration* $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 lands of pulse modulation is included. 12 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 Minneapolis 24, Minnesota Please send me a copy of "Electrical Noise" by William R. Bennett. (I enclose $10.00.) Name Address City & State Ibigawa Theatre Carbons Introduced To U.S. Market NEW YORK— Projection carbons which have been in use in Japan and internationally for many years have been introduced to the U. S. market through the import agents here, Nosawa & Co., Ltd., 180 Madison Ave., New York 16, N. Y. Telephone is LE 2-1198. Produced by the Ibigawa Electric Industry Co., Ltd., Ogaki, Japan, the Ibigawa carbons are said to provide brilliance, steadiness and correct color balance, thus affording excellent projection light with economy. High intensity AC and DC carbons are available, the latter in non-rotating or rotating positive type. Brochures from the agents here describe trims and lengths available. Carbons for spotlight and studio lamps are also available. Ibigawa cinema carbons were granted the Ohkouchi commemorative award in 1958 because of the production methods used. iP SPECIAL RATES On group subscriptions to IP for IATSE Locals and audio visual groups. Write for details. GIVE UP? — If you like guessing games, we'll give you three tries at identifying these weird-looking triangles. Or if you give up easily, as we do, here's the answer — they are pyrometric cones used for telling exactly when a batch of motion picture projector carbons is ready to leave the oven after the baking cycle. They are but one of the quality control techniques used by National Carbon Co., division of Union Carbide Corp., to produce projector carbons that provide motion picture audiences with today's finest screen light. Two of the heat-sensitive cones are placed in every baking furnace, and when one is leaning and one sagging, as shown, the proper temperature has been reached and the projector carbons are removed for further pro"~ cessing. International Projectionist July, 1963