International projectionist (Jan 1963-June 1965)

THE V.F ^SOPE* REG.U.S.PAT.OFF. IN PROJECTOR PARTS YES, the Very Finest in Projector Parts for over 50 years. The ultimate in precision, longlife and dependability. Available through your Theatre Equipment Dealer. 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 lands of pulse modulation is included. 14 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 S INTERNATIONAL PROJECTIONIST | Post Office Box 6174 ! Minneapolis 24, Minnesota Please send me a copy of "Electrical Noise" by William R. Bennett. (1 enclose $10.00.) NATIONAL CARBON from page 8 plane. We spent a very pleasant and educational two days inspecting development and research laboratories. This was the first tour of arc carbon production and processing techniques ever extended to the motion picture press. To this reporter the revelation was a very illuminating experience, and I, who has spent the greatest part of my career in the motion picture trade press industry, feel I have learned a great deal by it. Basic research and work on the physics of carbon arc as a light source has become a "perfect science" with National Carbon Co.'s technical staff in Fostoria and Parma. In addition about 1,000 plant workers in the actual processing steps of making a studio or theatre arc carbon there are over 350 scientists engaged in research and development in the U. S. operation alone. Several other plants and laboratories in other parts of the country and overseas are engaged in various other by-product activities. In fact, Union Carbide Corp. and its many subsidiaries, including the international division, represent an operation employing nearly 150,000 people world wide. About 10% of this figure is engaged in arc carbon product activities used extensively in motion picture studios, laboratories, and theatres and by the photographic industry. American "Know-How" Is it any wonder then, that the motion picture public today looks to the American "know-how" of American motion picture product manufacturers to supply the best possible technical results in their screen attractions. As Bill Cosby, our co-host stated: "Ever since the motion picture industry's inception. National Carbon has been a leading supplier of arc carbons, and through the years it has played a major role in the advancement of National Carbon Co. Production Personnel C. E. Stollenmeyer, District Works Manager J. G. Kemp, Head, Product and Processes Control Laboratory M. J. Scharf, Assistant Head, P and P Control Laboratory R. F. Burden, Group Head, Control Engineering L. E. Wentzke, Assistant Plant Manager, Production Development' Personnel Dr. W. J. Spry, Development Manager, Fostoria Laboratory E. L. Piper, Division Manager for Product Development W. R. Lauzau, Development Leader Research Personnel J. C. Bowman, Director of Research Dr. W. W. Lozier Assistant to the Director of Research International Projectionist August, 7963 "