The international photographer (Jan-Dec 1938)

PHOTOGRAPHER October, 1938 — 23 tions at a rate sufficient to render invisible dark striae produced by the edges of the prisms. No. 2,124,297 — Polarization Device for Cameras. Carl Herrman, Jena, Germany, assignor to the firm of Carl Zeiss, Germany. Application May 12, 1937. In Germany May 30, 1936. 2 Claims. (CI. 95-64) A light polarization device for cameras which is hinged to permit of its being placed or removed from in front of the lens, and may be rotated in order to transmit the various planes of the incident light. No. 2,124,322 — Film Pull-Down Mechanism. Albert W . Tondreau, assignor to Warner Bros. Pictures, Inc. Application Nov. 22, 1935. 13 Claims. (CI. 88-18.4) A film pull-down mechanism comprising the combination of a film advancing member, a rocking slide bearing for said member, an eccentric, a drive shaft for said eccentric, a connecting member slidably connected to said bearing and pivotally connected to said eccentric, means for imparting an oscillating motion to said film advancing member under control of said connecting member, a second connecting member pivotally connected to said eccentric, a cam, an operative connection between said second connecting member and said cam, a cam follower for said cam and an operative connection between said cam follower and said film engaging member for imparting a film engaging and disengaging motion to said film advancing member. No. 2,124,371 — Methods of Producing Photographic Image Carriers Provided with Precipitants for Coloring Dyes. Richard Gschopj and Karl Pokorny, Austria; said Pokorny assigner to said Gschopf. Original application Jan. 10, 1934. In Austria July 22, 1933. 2 Claims. (CI. 101-149) A method of producing a carrier for imbibition dye prints in which the gelatine layer is provided with precipitants for the dyestuffs, consisting in introducing ammonia into a sojution of gelatine, adding a dye mordant in the form of a complex acid thereto, adding acetic acid in amount sufficient to react with the ammonia to form ammonium acetate, and utilizing the resultant solution for making a carrier film. No. 2,124,587 — Motion Picture Projector. William J. Morrissey, N. Y. Application Nov. 26, 1934. 2 Claims. (CI. 88-16.2) In a motion picture device, a motion picture film strip, a frame, a film gate, a sound gate spaced apart from said film gate, a series of free rollers for guiding the film to and from said sound gate, some of which are positioned between said gates, said series of free rollers being provided for carrying the film strip with a minimum of sprocket tooth ripple, an arm pivoted on said frame, an engaging roller carried by said arm and normally positioned in engagement with one of said free rollers positioned between said gates, a stud carried by said arm and spaced apart from said engaging roller whereby when said arm is turned to disengage the latter from said last free roller for threading the device, said stud and said free roller define a predetermined length of film between said film gate and said sound gate adapted to form a loop when the arm is turned to re-engage said engaging roller with said last free roller, and a sprocket spaced apart from said series of free rollers for pulling said film strip along a path formed by said free rollers. No. 2,124,938 — Take-Up and Rewind Assembly for Motion Picture Projectors. Otto Wittel, assignor to Eastman Kodak Co.. Application Dec. 17, 1936. 12 Claims. (CI. 242-55) In a motion picture projector the combination with a support, a supply reel mounted thereon, a take-up arm pivotally mounted on the support, a spindle journalled thereon, a take-up reel on said spindle, frictional driving means for said spindle, said driving means normally supporting the take-up arm and its associated parts whereby Landers & Trissel, Inc. CAMERA RENTALS SERVICE Blimps, Dollies, all Accessories CAMERA CRANE DAY PHONES 6313 SUNSET BOULEVARD Hillside 8333 Near Vine Street HOLLYWOOD. CALIFORNIA NITE Landers HE-1311 Trissel SUnset 25992 FAXON DEAN INC CAMERAS, BLIMPS-DOLLYS FOR W2MT MO. 11838 4516 Sunset Boulevard Night NOrmandie 22563 EASTERN j HEADQUARTERS, FOR THE CAMERAMEN1* bell a STUDIO £CU UUfiSE TTINGROOM EQUIPMEN" 1 FKICe FRANK-ZUCKER rBnnR-iu<.i«n CABLE AODKtSS. CINtqulK f* AMERA EQUIPMENT V2* 16 OO BROADWAY nyc \ CIrcle 6-5080 EVERYTHING PHOTOGRAPHIC FOR PROFESSIONAL AND AMATEUR The World's Largest Variety of Cameras and Pro jectors, Studio and Laboratory Equipment with Latest Improvements as Used in the Hollywood Studios. New and Used. Send for Bargain Catalogue. HOLLYWOOD CAMERA EXCHANCE 1600 Cahuenga Blvd. HOLLYWOOD, CALIFORNIA Hollywood 3651 Cable: Hocamex