Motion Picture Herald (Apr-Jun 1956)

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about 1.65, or 165% of the “standard” white. The brightness gain for side viewing, however, is considerably better than the plain surfaced screen of Curve 3. At 10° the lenticular screen has 160% gain, at 20° the gain is 145%, at 30° the gain is 130%, and at 40° it is still better than “standard,” being 105%. In fact, this lenticular type of screen does not drop below the brightness of a regular white screen until the viewing angle exceeds 50°. Figure 5 should demonstrate very clearly that, where reflective efficiencies are equal, brightness gain may be increased for a selected viewing angle, but only at a sacrifice of brightness for the wider, or side, viewing angles. The higher the gain for the narrow viewing angles, the greater the loss for the side angles (compare Curves 3 and 4 with Curves 1 and 2). The embossing on the surface of a lenticular screen produces tiny optical reflectors so designed and adjusted that the SCREEN FIGURE 6 — Seating areas covered by different screen characteristics. Brightness range between maximum and half maximum values for each type. Screen Curve 3 covers area under GHi. Screen Curve 4 covers area under LEK. Screen Curve 5 covers area under ABC. brightness pattern of this surface may be re-arranged for a better light distribution to seating having the wider viewing angles. Compare Curve 5 (for a lenticular screen) with Curve 3 (for an unlenticulated metallic screen of similar “gain”). In order to demonstrate the angle of coverage for different screens, we have taken the brightness distribution values represented by Curves 3, 4 and 5 and set them out in Figure 6. In this sketch, GHI is the seating area in which all parts of the high gain screen from Curve 4 would appear to have a brightness ranging from maximum to half of maximum. Any greater difference in brightness is bad. The total area under curve LEK represents the seating space similarly covered by a lower gain aluminized screen, such as demonstrated by Curve 3. ( Continued on page 31) <#x SI % E |J E B KNOW-HOW # X?1 ■i Ei brings a bonus.. MORE C P PER DOLLAR CLEANING POWER A COMPLETE LINE OF COMMERCIAL PORTABLE VACUUM CLEANERS Demonstration proves a Spencer Commercial Portable will get MORE DIRT, getting it FASTER and with greater EASE of handling. That is because no corners are cut in the design and manufacture of Spencers. They are FULL-POWERED, continuous-duty, rugged commercial-industrial equipment . . . the very best that the field can produce. The line is COMPLETE . . . the RIGHT machine and the RIGHT tools for your job. Get the facts and compare before you buy. Prices? Competitive and to meet your budget. Write Dept. BT. THE SPENCER TURBINE COMPANY • HARTFORD 6, CONNECTICUT When this man walks into your theatre... ...your service worries are over. In thousands of theatres throughout the United States, exhibitors and projectionists welcome the appearance of an ALTEC field engineer. Why? Because ALTEC SERVICE is always one step ahead of the industry’s continuing technical parade. Whether your sound is optical, magnetic, optical-magnetic, single or multiple channel, ALTEC field engineers have the right answer for every problem. Get in step with ALTEC. Join 6,000 ALTEC customers in the march to better sound. SPECIALISTS IN MOTION PICTURE SOUND 161 Sixth Avenue • New York 13, New York BETTER THEATRES SECTION 25