Projection engineering (Jan 1932-Mar 1933)

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JANUARY, 1932 Page 31 General Radio Volume Control employing an entirely new circuit and mechanical construction at low cost. Contacts of Advance metal (using same wire for its resistance). Noise level is low and may be used in circuits at levels as low as 60 to 80 decibels without introducing noise in the circuit. Type 652 M.A. 652 M. B. 652 M. C. Impedance 50 ohms 200 ohms 500 ohms Price $12.50 12.50 12.50 Let us assist you in your requirements r -nheHome of RADIO. J 45 VESEY STREET NEW YORK CITY IIIIIIIIIIIMI, III Mill Mllilllh ■H.ll III I iiiiiiiiiiiiiiTniiiiiiiiiiiiiiitMi Investigate These Sound Heads for Simplex or Powers — =SYNCR0FILM "B"= Designed especially for small theatres where low priced equipment is desirable. Compact and sturdy in construction, simple to operate, perfect in efficiency. Smooth, quiet, positive drive assures even tone quality without distortion. Furnished complete and include all necessary attachments for projector. EASY TO INSTALL $275 complete per pair MONEY BACK GUARANTEE WEBER MACHINE CORP. I 59 RUTTER ST. ROCHESTER, N. Y. Export Dept.: 15 Laight St., New York City SHURE CONDENSER MICROPHONE ANNOUNCING AN EXCEPTIONAL INSTRUMENT The product of years of development and laboratory experimentation. Designed to meet the most exacting requirements for high quality radio broadcasting, sound recording, sound measurement tests, and public address work. Frequency response remarkably uniform combined with high output level and extreme wealth of richness in tone quality. WRITE FOR DETAILS Send for descriptive literature giving full details regarding the fidelity of the condenser head, the special 2-stage amplifier built into the case, and all other electrical and physical characteristics. GUARANTEE Each instrument is backed by a liberal one year guarantee which gives assurance of the high quality in spite of the low price. SHURE BROTHERS COMPANY . Manufacturers-Engineers S.N. SHURE. Pre.. 337 WEST MADISON ST CHICAGO. ILLINOIS Demanded 1 1 ! Portable Type Reflector Arc Lamp Designed for projection of 35 or 16 mm. fijm. Especially valuable with sound equipment, giving a brilliantly illuminated picture as large as 8 to 12 feet wide, even on porous screens. Operates from any lamp socket with current from S to 16 amps. Weighs less than 25 lbs. Size 19" x 12" x 10". Extremely simple in operation. A new rectifier unit as companion to this lamp is also available. For Sale by Independent Supply Dealers <3he Strong Electric Corporation 2501 LAGRANGE ST., TOLEDO, OHIO Export Office: 44 Whitehall St., New York, N. Y.