Business screen magazine (1944)

TBA Convciuion Sees New GE TeIe\ision Projector ♦ PrctiM' ili< lioiiic liininj; cil illiiiniiuiLinn and (.inu-ia Itilxsianning ol inotinii pidiiii' liliu frames arc [caturis ol a niw ■■pulsed liglii " nioiion piduic projector [or television stations e\liibitetl by C'.eneral Eleetric's Elecironies cleparlnient at the Television Broadcasters Association convention in New York last tniintli. Features Capillary Lamp I'hesc features are accomplished b\ using a capillary lamp whose light pulses are timed and controlled by signals from the television station's s\ nchroni/ing pulse generator which also times the "sweeps" of the television camera tube that views the film frames. The ""on-off"" light pulsing action of the capillary lamp eliminates the need for the mechanical shutter used in conventional projectors, according to General Electric. Previouslv. to attain reasonable efficiency in film lighting and timing with respect to the scanning operation b\ the camera tube, mechanical shutters had to be driven at a high speed by relatively powerful motors. This usually caused excessive vibration in the system. Uses St.\nd.\rd NfoLNT The capillary lamp is operated at ten times normal current (about ten amperes) during its short period of operation (500 microseconds e\ er\ 1 60 second) so that bright flashes of light are produced when the lamp is eneigized. Because of the intermittent operation, the average lamp current used is less than one-third of normal operation. The lamp, an optical system consisting of reflector and condensing lens which direct the light through the film, and an electronic pulse generator are "packaged'" together and mounted on a standard projector pedestal in place of the conventional arc lamp or other light source. The rest of the mechanism is similar to that used in present-day television projectors. « * * New Pictorial Film Depicts Story of C;hampagne Making ♦ The history of champagne making will be shown in a newfilm now being produced by Pic Piuductioit scfiw (ahtn'r) jynm film on the history of chnmjyagne. toiial Films Ini. lor the makers of Drv Imperator champagne. The film will be in 16 mm Kodachrome, and will run 18 to 20 minutes. The accidental discovery of champagne at the .\bbey of Haut\illicrs in the Pro\ince of Champagne. France in the 17th century wWX be shown, as will the step by step progress of champagne at Dry lmperator"s vine\ards and wineries— from the selection of proper grapes, through their growth, culture, and harlest, to the involved chemical processes, filtering, aging and bottling. MTPS Booklet Digests Films From Industry for Schools ♦ Forty-three sponsored films suitable for educational purposes are digested in the revised "'Index and Guide to Free Educational Films from Industry,"' published by Modern Talking Picture Service. The guide is distributed free bv Modern to all organizations and schools which have their own projectors. B & H Local Representatives Show Free Films to Veterans ♦ Hospitalized \eterans in most sections of the country are benefiting from a nation-wide recreational movement currently under wav among suitably located Special Representatives of Bell & Howell Company, according to a [joU com)3leted by the company recently. Free sound motion picture shows are being put on by the local representatives at veterans" hospitals which are accessible to them, it was learned. The programs are receiving a good response at all showings. The ONLY Screen with HEIGHT ADJUSTMENT! DA-LITE'S NEW CHALLENGER The "Slide-A-Matic" locking mechanism of the new Challenger makes it the easiest of all portables to set up and adjust in height. No separate movement of fabric or case! Simply lift up on the elevating tubing and the screen and case move with it in one operation, automatically locking in place at the desired height. No troublesome plungers or other external locking devices! The patented Ridge-Top Legs open and close with a gentle push — no release lock is necessary. Compare these and other exclusive Challenger features witli those of any other screen! You'll choose the simpler, sturdier Challenger every time. DA-LITE SCREEN COMPAM, Ihc ,2723 NORTH CRAWFORD AVENUE, CHICAGO 39, lltlNOIS NUMBER SEVEN • VOLUME SEVEN • 1946 39