Business screen magazine (1946)

Da-Lite adds more BRILLIANCE to your story! ORDINARY SCREEN Da-Llte SCREEN £66 the difference your slides and movies look BEST on a Da-Lite PROJECTION SCREEN! Colors are realistically, brilliantly alive on Da-Lite's WHITE MAGIC "wide angle" crystal -beaded projection screens. It's COLOR MAGIC . . . it's seeing projected color as it really is on vour film. And the controlled process WHITE MAGIC surface STAYS whiter, brighter-longer, never dulling the beauty of vour slides and movies. Yes. you'll see\he DIFFERENCE instantly when you see how WHITE MAGIC screen surface preserves that "natural dimension" captured in rich, true colors by your camera ! YOUR PHOTO DEALER WIU DEMONSTRATE THERE'S REAL colof mogic ONLY ON A ^BCIaiL|tG PROJECTION SCREEN THE FIRST AND FINEST PORTABLE screen with lail, Kisy "push-button" SEE THE "PUSH-BUTTON" PROJECTION SCREEN Tails how slldts, mov MAIL COUPON TO: Da-Lite Screen Co-, Inc. 2703 N. Puteski Road, Chicago 39, III. Send my copy of the COLOR MAGIC Booklet I NAME ADDRESS CITT _ ZONE STATE— nm IN THE NEWS OF BUSINESS FILMS THE CONGRESS of the llnited States and itfllcials of the nation's second largest city ((jhica^ol gave heed this past month to the IHililii interest in 16inni motion pictures for edulational and infonnationai purposes. On Monday. July 20 at 4:45 p.m. President Eisenhower signed Public Law 141 granting "hook rate" postage to films and other audiovisual materials ( including film catalogs ) . The hill carried the unanimous support of both houses of Congress, following its endorsement for passage by the postal committees which heard arguments pro and con these past several months. Chicago City Council Considers 16mm In early August, the Committee on Building and Zoning of Chicago's City Council considered an amendment to its modernized electrical code. This amendment called for the use of licensed union operators for all 16mm showings on projectors of 15 amperes or over. It would have been the first time that 16min. in any form, was considered by a major city in an "unsafe" category. A storm of public protest followed several articles in Chicago dailies and the news bulletins of interested 16mm organizations, including the Industrial Audio-Visual Association. At presstime. a meeting of Chicago building commissioner Roy Christiansen's electrical advisory committee with representatives of the audio-visual industry resulted in rewording of the Commissioner's recommendations to the Council, eliminating the objectionable provisions. The.se acts, in themselves, were sofid endorsements of the value which public and private organizations now' hold for this medium of communication and recreation. Chicago's city fathers, including nearlv every alderman and the mavor's office, were deluged with phone calls and letters of protest from club presidents, fraternal and religious organizations, business organizations, and prominent citizens. Congretismen Favor Vi ider Film Lse And in the hearings of Senate and House committees considering the "book rate " for film shipments in the face of Postoffice requests for added revenue in practically every category, there were moments of impressive eloquence on behalf of the 16mni film medium. Senators from predominantly rural states gave heed to their constituents' interest in less costly travel of farm films: eastern lawmakers spoke of the value of this medium in churches and schools, contrasting the comparatively few millions of cost to the billions now going into overseas aid. Much credit for the presentation of evidence and for their personal ap|)earances at repeated Congressional hearings in regard to this bill is due such individuals as Irving Boerlin of Pennsylvania State College who spearheaded this effort for the nation's educational u.sers: to members of I he National Education Association who aided: III NAVA committee head Ken Lilley of Harrisburg. Pa. and to many other individuals (such as Virginia's Henry Durrl who gave so unsjjaringly iif their lime. llinusjihorirnl Lrna Mntching lliiintin /'.ye Drvrloiwti for \avy lias I nIoUl Civilian I soi^ ■k S\iilhetic training de\ ices used during and after World War 11 to simulate actual combat conditions on the ground, in the air and at sea were previously limited by the capabilities of existing lenses to simulate natural observation. Therefore, to produce projected motion pictures that would e(|ual human peripheral vision became a challenge in optics. The optics designers of The Jam Handy Organization, after making test calculations, suggested to the Navy that a wider wide angle lens could be developed to fulfill this important training need. Although many optics designers believed that a refractive system to produce an angular view equal to the angle of the human eyes would not be possible. Dr. Irvine Gardner, head of the Optics Department. I nited .States Bureau of Standards, was directed to examine the proposed design ideas. After careful review. Dr. Gardner recommended that complete design calculations be carried out as the basic design seemed to have definite merit. The final design required more than a year of intensive work by optics engineers and mathematicians. It was again reviewed by selected optical scientists. The decision was made to build the lens. Physical Details of the New Lens The hemispherical lens which was constructed has a combination of larger aperture and greater angle than any previously known design. The focal length is 4/10 of an inch. No vignetting occurs and a bright picture results from edge to edge. Pictures produced with the lens are projected on a large spherical type screen. The screen is ISO degrees along the horizontal axis or horizon and is 90 degrees above the horizon and about 30 degrees below the horizon. This is more than a full quadrant of a sphere or globe. This is (he picture produced with standard .35mni projection and camera equipment. The lens is capable of filling a full one-half sphere with a picture if enough film area is provided. A bright picture from the arc projector fills the quadri-spherical screen and the observer seated at the center along the diameter of the sphere receives a ISO degree view which seems to completely surround him in the realism of the scene. At the correct viewing positions there is no distortion of any part of the picture. Used With Standard Cameras. Projectors Since standard cameras, projectors and film are used with the lens, the system may be duplicated econoniicallv. It is believed that it will play an important role in the future training of aerial gunners, navigators, pilots, guided missile operators and other military technicians. Under the I'nited Slates patent application filed by the Office of Naval Research. The Jam Handy Organization retains the commercial, theatrical and industrial rights for the use of this lens. The civilian applications are numerous, including the use of the hemispherical lens for TV. ICONTIM'ED ON TMK FOLLOWING PAGE TEN1 BUSINESS SCREEN MAGAZINE