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Projection engineering (Sept 1929-Nov 1930)

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Projection Engineering, June, 1930 Page 35 r Accuracy to y2 of 1% The new Durham wire-wound precision resistor can be secured to an accuracy of V2 of 1% . . . made especially for uses where accurate, high value, non-inductive, low distributed capacity resistors are required. Data sheets of this and other resistors sent gladly upon request. Please mention types and values in which you are interested. inii METALLIZED XTX RESISTORS & POWEROHMS INTERNATIONAL RESISTANCE CO. 2 0 0 6 Chestnut Street, Philadelphia, Pa. SOUND SERVICE Jenkins & Adair, Inc., with a background of six years' experience in the design and development of precision sound frequency equipment, is prepared to furnish the following service to sound recorders, manufacturers of sound apparatus and experimenters. Design, development and manufacture of accessories and essentials to recording sound on wax, metal or film. Design or manufacture of special transformers and filter components to meet specific requirements. Engineering service for recording companies and manufacturers of sound equipment. Testing service for manufacturers of sound equipment and recording devices. Send for our Bulletins. JENKINS & ADAIR, INC. Engineers CHICAGO, U.S.A. Cable Address JENKADAIR 3333 Belmont Ave. British Offices: 76 Old Hall St., Liverpool, Eng. 40 Buckingham Gate, Westminster, London, S W 1, Eng. French Office: 16 Rue de Chateaudun, Asnieres, France. WESTON MODEL 547 The Accepted Standard for Servicing Sound Equipment "Since the advent of synchronized sound with the motion picture, new problems confront the Projectionist. Chief among these is the proper operation and maintenance of the electrical equipment. The efforts of the entire motion picture industry and allied manufacturers are judged more or less by the results seen and heard at the theatre, and it is from these results that support for further development is derived. One of the necessary means of securing proper operation and maintenance of the electrical equipment is through the use of electrical measuring instruments." In this quotation from a recent editorial article on Servicing Sound Equipment is found recognition of the need for frequent electrical inspection of amplifiers and tubes, as well as the electrical circuits concerned with proper functioning of sound equipment. And in this new field, as in all others where electrical measurement is essential to efficient service, engineers and projectionists are turning to Weston instruments. The illustration shows a compact, portable equipment, known as the Weston Model 547 Radio Set Tester, recommended for this purpose. It comprises three instruments mounted in a durable Bakelite case with removable cover, and connected through a system of switches and binding posts so arranged that each instrument and range is automatically connected in circuit for every required measurement. Comprehensive in scope and simple to operate. Write for full particulars. Weston Electrical Instrument Corporation 608 Frelinghuysen Ave. Newark, N. J.