Year book of motion pictures (1930)

A short description has been published of the working principles of the KellarDorian process which uses film on the support side of which horizontal cylindrical lenses of 1/60 mm. diameter are embossed. (272) Exposure is made through a three-color diaphragm, the film being threaded in the camera with the emulsion side away from the lens. Patent protection has been granted for a number of improvements in processes using embossed films. (273) Bourquin (274) has given a description of the Wolff-Heide two-color additive process. Pictures are taken with an ordinary niotion_ picture camera at 28 frames per second, using film which has alternate frames sensitive to red and blue, respectively. Alternate frames of the print are dyed and the film projected at 24 frames per second. A few patents of interest pertaining to two-color additive methods have been issued. (275) The changing patterns produced by a suitable grouping of colored elements moving slowly past the end of a kaleidoscopic prism have been reproduced by Jones and Tuttle, (276) using a two-color subtractive process. The use of such color film for embellishment of theater programs is suggested. Mudrovic (277) has conducted an investigation on sensitizers and dyes suitable for use in the bleach-out process whereby film is coated with a mixture of three primary color dyes which bleach out in proportion to the amount and color of the exposing light. A chemical process called Pathechrome has been announced to replace the old stencil process of Pathecolor. (278) Subtractive color processes for which patents have been issued recently are related to imbibition printing, apparatus for exact registering of two films, production of double-width, double-coated film for recording two pairs of images in four colors, etc. (279) AMATEUR CINCMATCGCAPHy A. General Cameras. — A new spring driven camera taking 12 meter lengths of 16 mm. film has been described by Neumann. (280) Darkroom loading is required as both the drive and take-up reels are incorporated in a single metal magazine. Another new camera has been made to take 50 foot lengths of film but a new film having a thin base is also being supplied in 100 foot lengths. (281) A spring driven 16 mm. camera which is equipped for normal, slow motion, and trick exposures has been announced. It is equipped with an f/2.6 lens adjustable for all distances to one foot. (282) Two spring driven cameras taking 9^ mm. films were made available recently; one has a vertical oscillatory shutter for making the exposure. (283) and the other carries 8 meters of film which can be exposed at one winding if desired. (284) Projectors. — A silent running 16 mm. projector has been marketed which is fitted with a barrel-type shutter and claws having a double eccentric action. (282) Three other amateur projectors for 16 mm. film have been made available; one model is hand-cranked. (285) Accessories. — New accessories for the cine amateur include a lens turret accommodating three lenses, (286) a combination bridge table and movie screen, (287) electrically equipped console cabinets for storing camera, projector, film, splicer, etc., (288) an audible footage meter, (289) and various types of incandescent and arc lights. (290) Sound movies in the home may now be realized since the introduction of a phonograph turntable operated from an extension shaft to the projector to maintain synchronism. (291) A magnetic pickup transfers the sound record to the audio amplifying system of an ordinary radio receiver. Scenarios, Amateur Movie Clubs. — About 80 amateur photoplays were completed by approximately twenty-five amateur clubs during the year 1928. (292) Film Processing. — Solutions for developing amateur films by the reversal method have been recommended by HenriRobert. (293) Two patents are of interest relating to equipment for continuous processing of amateur films. A controlled exposure (294) is given the film after the first development by passing the film over a light responsive element such as a thermopile which is excited according to the density of the film. The other patent describes a complete processing machine. (295) C B. Color Processes An additive process of three-color cinematography for the amateur using 16 mm. film was announced in August, 1928. (296) A three-color filter is used on both the standard camera and projector and a series of tiny cylindrical lenses are embossed vertically on the film support. The film is threaded in the camera with the emulsion side away from the lens so that the light passes through the embossed 846