The motion picture projectionist (Nov 1931-Jan 1933)

36 Motion Picture Projectionist November, 1931 SYNCROFILM MODEL J SOUND EQUIPMENT Weber Machine Corp. was first to recognize the needs of the small theatre for a first class sound equipment equal to the best, but at a price in keeping with its abilities to buy and still keep reasonably on the black side of the ledger. Weber Syncrofilm quality has been recognized from the very beginning. It is among the leading sound equipments, yet is sold at a low price and absolutely free of all extra charges, such as service, fees, etc. Model "J" is the most advanced. It is already in daily use in many projection rooms throughout the country. $27500 per pair WEBER MACHINE CORPORATION 59 RUTTER STREET, ROCHESTER, N. Y. Export Department: 15 Laight St., New York City. Cable: "Ariab," New York Complete your booth equipment with a « 99 REWIND PULLEY Takes the place of space collar on r«el shaft — Crank is not removed. Price $2.50 at your dealer Manufactured by BEST DEVICES CO. 2108 Payne Avenue, Cleveland, O. MR. PROJECTIONIST: Good projection is up to you. Insist that the screen is kept in first class condition. You know the best equipment is useless if the screen is old or dirty. After all, good Projection is only as good as your Screen . . . Our Screens "clinch" good projection. A Screen for Every Type of House The Hallmark of Quality \^|lite ^ound Screen, -Glare • Diffusive and Service CKVSTAl BEADED BEADED SCREEN CORP., Roosevelt, N. Y. Write for Samples and "Getting the Light You Pay For" response. Usually, however, screens exhibit a drooping characteristic at high frequencies. Since the droop at high frequencies is usually rather gradual, no definite frequency range may be assigned to the screen response; the allowable loss at certain high frequency points relative to the 1,000cycle response should be specified. On the whole, it must be observed that it is difficult to set absolute limits for screen response, covering all possibilities. The following have been applied successfully to the great majority of cases by the two largest manufacturers of sound equipment: A loss of 2.5 db., as given by the average response curve, at 6,000 cycles, relative to the 1,000-cycle response, is considered a desirable limiting value for existing types of sound equipment. Screens that meet this requirement are usually found to attenuate less than 4 db. at 10,000 cycles. As to regularity of response, variations greater than ± 2 db. would not be tolerable. Because of standing wave effects in the measuring room, inaccuracies of measurement may occur, causing variations somewhat greater than this below 300 cycles. It is felt that no limits for regularity should apply below this frequency. (To be continued) AName that Commands Respect v V V V V V V V V V V Each year adds an abundance of good will and respect for the name — Vallen. And this is as it should be — the reward of 16 years effort in making stage equipment equal in operating efficiency and correlated to the projection equipment. The name Vallen on any piece of equipment is an assurance of the finest and most practical equipment money can buy. VALLEN ELECTRICAL CO. INC. AKRON, OHIO Manufacturers of Vallen Syncontrol ; Vallen High-Speed Curtain Control ; Vallen Junior Control ; Vallen Automatic Screen Modifier; Vallen Noiseless All-Steel Safety Track; Vallen Curved Track; Electrical Awning Operator; Electrical Window Shade Operator; Midget Control for Display Window Curtains ; Vallen Adjustable Volumo Ventilating Fan. '/MLS/M DARES TO GUARANTEE