International projectionist (Jan-Dec 1947)

TRIATIC SIGNAL TRACER {Continued from page 23) a somewhat lower vlotage to two cells or a Pec network. For testing of photocells and the adjustment of optical systems, disconnect the photocell from the idle machine and connect it to the amplifier input lead of the signal tracer, with the anode (plus lead) of the photocell to the center or tip of the input cable, and the cathode (minus lead) of the photocell to the ground clip of the input cable. The signal tracer is grounded and the +90volt switch, located on the front of the panel, is turned to "on" position which connects the +90 volts directly to the amplifier input cable. The amplifier section of the signal tracer is useful for testing microphones and phonograph pickups and other electronic devices. The microphone to be tested is connected to the amplifier input lead, with the "high" side, if any, of the microphone connected to the center, or tip, of the lead, and the "low" side of the microphone to the ground side on the input. Speaking into the microphone or exposing it to some other power source and listening to the reproduction in the speaker of the signal tracer will give an approximate indication of the condition of the unit under test. The amplifier may also be used as a means of communication between projection room and stage when tracing wires or making circuit adjustment. Connect a microphone to the amplifier input, and connect amplifier output to a stage line or run a two-conductor cable backstage to which a small speaker is attached. If a shielded cable is available from the projection room to the stage, a microphone may be placed in the projection room and connected to the amplifier input, the amplifier being located backstage. In this case the speaker supplied with the signal tracer is used. Communication by means of this instrument will save hours of valuable time. BOOK REVIEWS Television Techniques by Hoyland Bettinger — 237 pages, 29 drawings and 18 photographs. Published by Harper & Brothers, New York, N. Y. $5 A complete guide to television production and showmanship, this book should interest anyone connected with television, from the technician to the sponsor. Beginning with a simplified discussion of video principles, it continues through the study of visual continuity and composition. Such factors -as eyestrain, audience orientation and "tricks of the trade" are discussed, along with a comprehensive study of microphones, recordings and other television fundamentals. In addition to the elementary and technical phases of the subject, such important aspects as television writing, directing and producing and motion picture and film integration. No elementary "how-to-do-it," the volume is written as an explanation of the underlying principles and fundamentals that analyze the factors entering into all types of production, rather than as a text for teaching cut and dried methods. The application of the principles involved are set forth in such a way that one may apply them according to his own tastes and in his own way. The author is a consultant on television programming and production, formerly general manager of the GE television station, WRGB at Schenectady, N. Y., His theatre and motion picture background, plus his intensive television experience qualifies him as an authority, not to be disregarded. G.E.N. Loew's Net Down in 1947 Net profits for Loew's, Inc., for the year ending August 31 last are estimated in Wall St. circles at about $2.75 per common share, as compared with the $3.52 reported by the company for the preceding year. Earnings for the last quarter of the fiscal year reflect a decline of about 37%. Some recovery in earnings is anticipated for the current quarter, but it is not anticipated that earnings will rise to the 1946 level for sometime to come. * Ask the man who bought a Transverter 10 or 12 years ago. He'll tell you he bought uninterrupted service and constant screen illumination at low operating cost The thousands and thousands of Transverters now in use are your assurance that you can place confidence in the Transverter for every projection arc requirement ■Jr See your nearest National Theatre Supply dealer. THE HERTNER ELECTRIC COMPANY Exclusive Manufacturer of the Transverter 12600 ELMWOOD AVENUE A General Precision Equipment Corporation Subsidiary >D AVENUE • CLEVELAND 11, OHIO INTERNATIONAL PROJECTIONIST November 1947 33