Motion Picture News (Oct-Dec 1930)

112 Motion Picture News 0 ctober 4 , 1930 New Front Plate and Lens Adjustment To Facilitate Manipulation Practically an Instantaneous Change of Lenses is Possible with Neu' Unit, International Projector Claims INTERNATIONAL PROJECTOR CORP., has placed on the market a new Power's front plate with lateral lens adjustment and a Power's aperture change assembly, to facilitate manipulation of lenses and apertures on Power's projectors equipped for sound projection. The new front plate assembly is designed along the lines of the former type, but a number of new features have been added. Practically an instantaneous change of lenses is possible with the new unit, International says, and a lens centering device has been added, making it possible to center the projected picture on the screen when sound-on-film system is used. This feature is said to permit use of the proportional type aperture plate and a shorter length focal lens, so that the projected picture may be increased in dimension to meet the dimensions of the silent or sound-on-disc prints. Old Type Rack Eliminated Another feature cited is elimination of the old type rack and pinion lens focusing adjustment and substitution of the micrometer type of focusing pinion which allows accurate adjustment of the lens and eliminates possibility of the lens jarring out of focus during projection. A new type framing lamp assembly has been incorporated in the new device and may be instantly removed for lamp replacement when necessary. The pull chain for the lamp socket is readily accessible to light the framing lamp when threading the projector. A reference to the lettered illustration. Fig. 2 in connection with the following data, will explain the operation of this equipment. A is the front plate which attaches to the Power's mechanism in a similar manner to all previous types. B is the lens mount and focusing assembly attached to the front plate A. Lenses are securely clamped in this mount by locking screw C. Lens Adjustment Centers Film D is the lateral lens adjustment by means of which the picture is centered on the film and screen when changing from silent or ^ound-on-disk, to sound-on-film with either the proportional or regular sound aperture. E is an adjustable stop for determining the lateral throw of the lens. This stop is adjusted when the installation of the assembly is made and remains fixed thereafter for any given focal length of lens. The two knobs F are attached to the micrometer focusing device and, as will be noted, may be operated from either side of the projector. G is. the pull chain for the framing lamp and H is the framing lamp assembly latch, one of which is attached to either side of the assembly so that the instant removal of the framing lamp assembly may be readily accomplished without interference with any other part of the unit. Fig. 1 shows a fixed focus collar, similar to that used on the Super Simplex Projector, by means of which lenses may be instantly snapped into focus where quick lens changes are necessary. The hole G, Fig. 1, in the collar slips over rod J, Fig. 2, and thereby accurately locates the lens rotationally so that the picture is always in the same place on the screen regardless of how many times the lens may be removed and replaced. Where lenses do not project far enough beyond the lens mount B to allow this fixed focus clamp to be readily attached, many of the lens extension attachments used in connection with lenses on Super Simplex Projectors may be used. First Nat'l Wins Fire Trophy Charlotte — First National exchange has been awarded the silver trophy, marking first place in the nation-wide competition for maintaining the highest average \in measures taken toward fire prevention in film buildings. Sherwood Brockwell, state fire marshal, presented the trophy to Manager F. P. Bryan at the exchange building. The conservation department of the Film Board of Trade is donor of the cup.