International projectionist (Jan-Dec 1957)

New Products for the Industry A High-speed /:1.4 lens capable of projecting all film widths up to 70-mm was introduced at the recent TOA-TESMA convention by Projection Optics Co. of Rochester, N. Y. The lens can handle the wide film in focal lengths from 2.75-inch E. F. up. According to Fred Aufhauser, president of Projection Optics, the lens was "designed to give the maximum light with special emphasis on the elimination of the so-called hot-spot." Genarco, Inc., has announced a new slide changer for S1/^ x 4-inch slides, the only slide changer for those dimensions in this country. The changer will take as many as 70 slides in a compact magazine, slides being changed by pushbutton remote control in less than a half-second. The Genarco Model 6800 can be mounted on most existing S1/^ x 4 New Genarco 70-slide changer Model 6800. inch slide projectors. The company asks that prospective customers indicate the model of their slide projector on which the changer will be mounted. For information: Genarco. Inc., 97-00B Sutphin Blvd., Jamaica 35, N. Y. Nine new unitary loudspeakers have been added to the line of coaxial and TRIAXIAL high-fidelity loudspeakers produced by Jensen Manufacturing Co. of Chicago. The new speakers include a three-way 15 inch TRIAX loudspeaker Model G-600. This TRIAX, with the firm's G-610 TRIAXIAL (introduced originally in 1950), is said to provide the only two unitary three-way speaker systems having three independent electrical and acoustical channels. Four new Type CX coaxial three-element speakers in both 12 and 15-inch sizes have also been added to the Jensen line. In these units, a dual diaphragm provides a claimed outstanding low-fidelity and midrange performance, while a compression driver "supertweeter" covers the higher frequency range. Also included are the two new DUAX two-element loudspeakers in 12 and 15inch sizes which use dual diaphragms and two new UNAX deluxe extended range speakers in 8 and 12-inch sizes. The sharps color chart and gray scale is now being distributed by Camera Equipment Co., Inc. of New York City. The color chart will aid TV and photographic technicians in determining in advance just how colors will reproduce in monochrome. The chart is simple to use and will cover all the known requirements of day to day operation. The precision reference chart is applicable to TV, cinematography, photography, and the graphic arts. A new 9-mm positive projector carbon is now being released by National Carbon Co. Designated the Suprex 9-mm by 14-inch positive carbon, it is recommended for operation in a 65 to 85-ampere current range. The company claims that the new 9mm carbon is designed to produce up to 10 per cent more light, and burn up to 30 per cent slower than previous type carbons in its current range. The new carbon is the most recent addition to the 7-mm. 8-mm coppercoated carbons previously developed, and the new 10-mm, 11-mm. and 13.6-mm high-intensity positive carbons recently developed to meet the light requirements of widescreen processes and drive-in theatres. Picto-scope, a special lens system that will work on 35-mm cameras and projectors for widescreen pictures compatible with CinemaScope. has been developed by Apex Specialties Co., which also provides anamorphic lenses for 8 and 16-mm cameras and projectors. The system squeezes 2.66 to 1 ratio onto the regular camera film, and unsqueezes it for projection. With full standard frame, Picto-Scope is compatible to CinemaScope aspect ratio 2.66 to 1 ; with optical sound on 35-mm. to aspect ratio 2.35 to 1 ; with magnetic sound on 35mm. to aspect ratio 2.55 to 1. The anamorphic Picto-Scope lenses are in micrometer focusing mounts, and are said to be equally suited for color or blackand-white film. The Roberts recorder model 90. which Roberts Electronics, Inc. of Los Angeles has recently developed, is claimed to be the first medium-priced magnetic tape recorder with a hysteresis synchronous drive motor. This drive motor and a precision-balanced flywheel are said to hold wow and flutter to 0.18 per cent at 7V2 inches per second. Designed with greater power than it is required to put out, the motor is maintained to remain cool over hours of continuous recording. The portable unit is styled in a hardwood carrying case covered with sheer Roberts tape recorder. gray pyroxalin. and weighs 28 pounds. The complete package including mechanism, amplifier, preamplifier, speaker, and microphone, has high and low level input and output, either through the 7-inch extended range self-contained loudspeaker, or an external output to other equipment. The new amplifier features professional terminal board wiring, and has an illuminated VU meter for precise control of recording levels. Frequency response is quoted at 40 to 15,000 cps at 7% inches per second, and 50 to 7000 cps at the 3%-inch speed. Signal to noise ratio is 50 db. A resetable index mounted on the front panel allows instant location selections on the tape. Negastat 107r is a new anti-static lubricant for phonograph records and transcriptions. Besides cleaning and rendering records free from static, the lubricant is claimed to add life to the needle and record. It can be safely used on all types of records and is non-flammable and non-toxic. For details: Jack's Creations, P.O. Box 426. Chicago 90. Illinois. Film Festival Opens The International Film Festival opened in San Francisco on December 4 with entries from a dozen countries. The San Francisco Art Commission has appointed Irving M. Levin, of San Francisco Theatres as coordinator. 32 INTERNATIONAL PROJECTIONIST • DECEMBER 1957