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90 Transactions of S.M.P.E., Vol. XIII, No. 37, 1929
A few patents of interest pertaining to two-color additive methods have been issued.^^^
The changing patterns produced by a suitable grouping of colored elements moving slowly past the end of the kaleidoscopic prism have been reproduced by Jones and Tuttle, ^^^ using a two-color subtractive process. The use of such color film for embellishment of theatre programs is suggested.
Mudrovic^^^ 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.^^^
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.^^^
VI. Amateur Cinematography A. General
Cameras. A new spring driven camera taking 12 meter lengths of 16 mm. film has been described by Neumann. ^^^ 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. ^^^ 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.^^^
Two spring driven cameras taking 914 mni. films were made available recently ; one has a vertical oscillatory shutter for making the exposure,^^^ and the other carries 8 meters of film which can be exposed at one winding if desired. ^^*
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.^^^ Three other amateur projectors for 16 mm. film have been made available ; one model is hand-cranked.^^^
Accessories. New accessories for the cine amateur include a lens turret accomodating three lenses,^^*^ a combination bridge table