International projectionist (Jan 1959-Dec 1960)

watts, about half the power required by a small low-intensity arc, which is hotter, yellower, and dimmer. The same Suprex trim burns at 42 amps., 36 volts (1500 watts) to give 8600 screen lumens with a 14-inch diameter — more light than a 35-amp L.I. arc at less power consumption. H.I. arcs provide enough light for flickerless 3-blade shutters to be used with 5-to-l intermittent movements in preview rooms. Mazda incandescent bulbs are clean and convenient, but are unsuitable for the projection of color films. The new tenon lamps, not yet manufactured in the U.S., appear promising for this purpose. Q. Cost not considered, what are the processes and precautions one could take to insure an absolute minimum of vertical jump in projected pictures, not limiting your recommendations to the geneva movement alone, and excluding an off-standard type of film? A. Use of a high-grade geneva movement is, of course, absolutely necessary for rocksteady pictures — no vertical "jumping" of the picture. But even when such an intermittent is used, the intermittent sprocket must be positioned as close to the gate aperture as possible (to minimize the effects of uneven film shrinkage), the gate film trap should be as long as possible, adequate uniform tension should be applied to the film in the gate by the pressure pads, and the upper and lower film loops should not be so large that they "flop" and tend to disturb the film in the gate. The sprocket teeth must be accurately ground and unworn, and the sprocket must be fastened to the starwheel shaft by a method that does not allow it to run "lop-sided." A lop-sided sprocket produces 6cycle vertical "dancing" of the picture. iP Kodak Scientists Prepare New Photo Textbook Edition A new edition of a standard reference work and textbook, "Fundamentals of Photographic Theory," has been prepared by Dr. T. Howard James and Dr. George C. Higgins of Kodak Research Laboratories in Rochester, N.Y. Rapid advances in such fields as the theory of color photography and sensitometry necessitated revision of the text and the addition of 66 pages to the book. It was first published in 1948. The authors added extensively to chapters on the mechanism of development, the structure of the developed image, and the theory of the formation of the latent image. New criteria for evaluating photographic systems are included. The new edition, published by Morgan and Morgan Inc., New York, covers what happens to film from the instant of exposure through development, fixing, washing, and print making. The authors also describe the chemistry of the formation of dye images for color photography. Dr. James, a senior research associate, has been with Kodak Research Laboratories since 1936. He is the editor of "Photographic Science and Engineering," section editor of "Chemical Abstracts," and a lecturer in photographic theory at the Rochester Institute of Technology. Dr. Higgins formerly taught at Billings Polytechnic Institute, Billings, Montana, and the University of Wyoming. He joined Kodak Research Laboratories in 1943 and is now associate head of the physics division. iP HARRISON SERVICES ST. PAUL, MINN. — Funeral services for George Irving Harrison, 63, of 117 Eighth St., White Bear Lake were held here. Mr. Harrison, a motion picture projectionist, had lived in White Bear Lake for the last twenty years. He was projectionist for the St. Clair Theatre for four years. He was a member of Garnet lodge No. 166, A.F. and A.M., White Bear Lake, and the Motion Picture Operators union of St. Paul. Survivors include his wife, Amy, White Bear Lake; a son, Robert, Minneapolis; a brother, Kenneth, Stillwater, and two grandchildren. iP Better Light! Lower Costs! RINGSDORFF CARBON CORP. East McKeesport. Pa BOOKS ON ELECTRONICS . . . WORLD FAMOUS FOR TECHNICAL EXCELLENCE Learn the "picture-book" way! You can master the basics of electricity, electronics or television with these easy "learn-by-pictures" courses. Hundreds of bold, dramatic, informative, specially prepared illustrations make ideas easy to understand. There is one idea to a page with at least one big illustration to make the text crystal-clear. Step-by-step explanations let you learn as slowly or as quickly as you like. Study at home ... no teachers ... no correspondence. It's the easiest way to learn the fundamentals of electricity, electronics and television. 1. BASIC ELECTRICITY Soft Covers, 5 volumes, 624 pp., Only $10.00 per set 2. BASIC ELECTRONICS Soft Covers, 5 volumes, 550 pp., Only $10.00 per set both by Van Valkenburgh, Nooger, Neville, Inc. 3. BASIC TELEVISION by 9lexander Schure, Ph.D., Ed.D. Soft Covers, 5 volumes, 688 pp., Only $10.00 per set 4. HOW TO READ SCHEMATIC DIAGRAMS by David Mark covers the symbols and abbreviations used in schematic diagrams related to the electronics field. Starts with individual components and carries through to complete receivers and similar equipment. Components and circuits are not only identified, but also explained — making this a short course in electronics. Soft Cover, 160 pp., illus., Only $3.50 5. HOW TO USE METERS by John F. Rider explains in detail the construction and operation of all types of electrical meters. Gives the details of what kind of meter to use for making different kinds of measurement and tells you where to connect from John F. Rider Publishers, Inc. the meters. Soft Cover, 144 pp., illus., Only $3.50 6. STEREOPHONIC SOUND by Norman H. Crowhurst can save you hundreds of dollars by guiding you to the choice of the right stereophonic equipment for home use. Covering all the main systems, this book explains theory and tells you how to get the most listening pleasure from the various systems. It guides you in selecting loudspeakers and other components. Also, it discusses stereo systems and techniques used for motion pictures. Soft Cover, 128 pp., illus., Only $2.25 7. BASIC PHYSICS by Alexander Efron, E.E., Ph.D., makes physics self-teachable. A unique classroom-tested "spiral" approach, mature analystical explanations, clear illustrations and other learning aids make it possible for you to master this intermediate-level physics course through home study. This course is modern, rigorous, complete and balanced. It covers everything from the contributions of early Greek philosophers to satellites. Questions and problems let you test yourself as you go along. Mastery of BASIC tion you need for advanced technical PHYSICS gives you the firm foundastudies. Cloth Bound, 2 vols, in single binding, 724 pp., illus. Only $7.60 CLIP COUPON AND MAIL IT TODAY INTERNATIONAL PROJECTIONIST Post Office Box 6174 Minneapolis 24, Minnesota Please send me a copy of the books I have circled below. (I enclose payment.) I 2 3 4 5 6 7 Name Address City & State International Projectionist December 1960 17