Projection engineering (Jan-Dec 1931)

Page 26 PROJECTION ENGINEERING DEBRIE DEVICE PRINTS SOUND AND IMAGE AT SAME TIME Andre Debrie, Inc., French motion picture equipment company of 30 years' standing, manufacturing studio and laboratoryapparatus, including a machine for printing image and sound simultaneously, a device which several companies here have been trying to obtain, has established American headquarters at 551 Fifth Ave., New York. One of the important features of the Debrie equipment is a new studio camera for taking sound pictures, with the following improvements : 1,000 feet inside magazine, new model of rewind and take up, anti^buckling device with electric control, indication of sound track in printing and focussing apertures, simplified automatic dissolve, without lock, automatic safety cut out in case of faulty operation, aperture plates 18.2 x 24.5 with removable mask reducing to 18.2 x 22. The laboratory printing machine which prints simultaneously image and sound in normal and reverse sense at the rate of 3,000 feet per hour claims a special feature in that any amount of changes of light can be obtained by a simple process of a specially perforated control band which commands the light changes. Debrie also has apparatus for taking large films, 65 to 72 mm. Other items include a special high speed camera with 2,000 feet magazine to take pictures at the rate of 240 frames per second, and Debrie's polishing machine which takes out scratches on the old negatives and polishes at the same time. Basil Lermont is manager of the New York office. A KLIEGL ISSUES NEW CATALOG Kliegl Bros, of New York, manufacturers of lighting specialties, have announced the publication of a completely revised catalogue, with list prices adjusted to present-day levels, and with the very latest improvements and new devices for theatrical, decorative, and spectacular lighting, included in its pages — such as footlights, borderlights, spotlights, floodlights, and numerous other forms of lighting equipment and apparatus. The publication is complete in every respect, fully illustrated, thoroughly indexed and conveniently arranged for quick reference. This new Kliegl Catalog A is available to any one interested in lighting. Copies may be obtained, free of charge, by a request addressed to Kliegl Bros., 321 West 50th Street, New York, N. Y. A ELECTRO-ACOUSTIC SOUND SYSTEMTYPE EAP-12 The Electro-Acoustic Products Co., 200 E. Illinois Street, Chicago, introduces a new amplifier having many new and distinctive merits. This unit, catalogued as the EAP-12, is of the semi-portable type— a four-stage resistance coupled amplifier self-contained in a single unit requiring no preliminary amplification or input transformers for operating from carbon or condenser microphone or phonograph or radio reception. All input and output connections terminate in receptacles at the back of the amplifier. This makes the matter of installing equipment very simple. The amplifier utilizes in the output stage two type 250 tubes in push-pull and will deliver at least 12 watts of undistorted power. A variable output impedance switch is provided so that impedances as low as 8 ohms and as high as 3,000 ohms may be quickly matched, making it possible to use any type of speaker or a number of speakers in parallel. The amplifier has a gain of 6 d.b. with frequency characteristic practically flat to 9,000 cycles. A similar amplifier type EAP-12 PC is available with a gain as high as 95 d.b. for operation directly out of a photoelectric cell. This unit is particularly useful for operation in connection with mobile equipment such as automobile installations for advertising purposes. ANNOUNCES VERTICAL WOOL-PACKED BEARING MOTOR Bodine Electric Company, 2264 W. Ohio St., Chicago, Illinois, announces that, due to the construction of the end brackets of the new Type N-5 motor, they may be provided in vertical or flange mounted models to meet any specified requirement. Umbrella covers are optional on these installations. These motors are available in ratings of 1/10 and % h. p. at 1725 r.p.m. and 1/20 and 1/12 h. p. at 1125 r.p.m. A 300 WATT "NO RESISTANCE" LAMPS FOR VICTOR Victor Animatograph Corporation, Davenport, Iowa, announces that a new G-E Mazda projection lamp of 300 watts rating, which does not require any form of lamp resistance, is now available for use in all Model 3 and 5 Victor projectors and animatophones. The lamp may be obtained in voltages of 105, 110 and 115. Initial tests indicate that this new 300watt lamp may closely approach in intensity of illumination some of the highly efficient low-voltage lamps which employ rheostats or transformers to reduce the line voltage to that of the lamp rating. This new 300-watt lamp is of the regular 16 mm. T-10 size and is equipped with the bayonet type prefocussed base. A EARL CARROLL'S "VANITIES" ADOPT P-A. SYSTEM Earl Carroll's "Vanities" have adopted the Western Electric public-address system for sound amplification and in doing so they are presenting to the public, for the first time, innovations that promise to revolutionize legitimate stage producing. At the new 3,000 seat Earl Carroll Theatre, the largest house in the country for legitimate stage productions exclusively, a complete system of loudspeakers was installed for the opening of the new "vanities" on August 27. Six loudspeakers were installed in the auditorium itself and 20 in other parts of the building. Among the features possible because of this innovation in the auditorium itself are : 1. A general reinforcement of music and voice from the stage; 2. A disappearing orchestra working on an elevator platform so that after the orchestra has descended to the basement, the platform can be replaced and used for the stage production while the orchestra's music is still audible to the audience; 3. Provision for individual features involving a specially constructed microphone arrangement, including a microphone that can be raised from alongside the footlights through a push spring operated by one of the actors on the stage. This microphone system permits various combinations of musical effects on and off stage; 4. The use of special records to reproduce off stage sound effects. In addition to loudspeakers in the auditorium itself, others, in dressing rooms and in the lobby will help evolve a general efficiency system. In the lobby the loudspeaker makes pos sible the curtain announcement for the beginning of each act. The loudspeakers in the dressing rooms will enable members of the cast to hear a continuous reproduction of the performance on the stage and will make it possible for the stage manager sitting in the wings to keep the players in their dressing rooms advised of the play's progress and of their cues, eliminating the call boy's nightly rounds. The public-address system installation at the theatre was made by Electrical Research Products represented by J. J. Way, public-address system specialist and by I. F. Durst who supervised the work of installation. A SPECIAL IMPEDANCE MATCHING TRANSFORMERS Ferranti, Inc., 130 West 42nd St., New York, have developed a special impedance matching transformer which is able to transmit frequencies from 30 to 8000 cycles with less than y2 of 1 db. drop. This is obtained by the special type of construction used in the manufacture of these transformers which reduces the leakage reactance, self and mutual capacities to a minimum. These transformers are particularly suited for the exacting requirements of broadcast stations, sound studios, transmission engineering as well as special public-address systems and vacuum tube engineers. A few of the uses of this special impedance matching transformer are microphone mixing, microphone to line, tube to line, line to line, line to speaker, tube to speaker and tube to line. Many other special uses are found for this transformer which is wound to the customer's own specifications. In addition to these special units they still continue to manufacture their standard audio and output transformers which also give a particularly flat curve with a maximum transfer of energy over the entire broadcast range. Literature will be sent on request. A NEW GENERATOR Motor generators for replacing storage batteries in theatres have been developed by the Electric Specialty Company of Stamford, Conn. These machines supply low voltage direct current for the fields of loudspeakers and for the exciter lamps of the sound equipment. A simple filter system is used to supply power to the exciter lamps, but filters are not used with the horn fields. The machines are furnished complete with filters, when required, and they may be connected in place of the storage batteries. CANADY RECORDER Word comes from Don Canady that his company now has concluded all tests in perfecting a 16 mm. sound-on-film recorder. As the Canady Recording Co. now markets a complete line of 35 mm. recording equipment, together with recording lamps for sound-on-film, it is interesting to know that with the addition of the 16 mm. apparatus, no detail has been overlooked. Mr. Canady, well known in engineering circles, together with M. O. Mattlin, also an engineer of prominence, spent several weeks in New York recently demonstrating the Canady line to members of the trade. A favorable impression was created in the minds of all who saw and heard the results of the Canady recorder.