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84 Transactions of SM.F.E., Vol XIII, No. 37, 1929
A number of articles have appeared dealing with the technic of projection of sound pictures, both with the ' ' record-on-film " and disc types. ^"'^
A note published in July, 1928, mentioned that sound films in color would be available in the near future.^°^ A color sequence with sound was included in the picture ''Broadway Melody" released in the spring of 1929. The sound was reproduced from a disc record.
There have been quite a number of patents issued pertaining to various phases of sound film projection.^^^
Projection of Stereoscopic Pictures. Lane^^° has described a novel projector for stereo, color and standard films, a demonstration of which was given at the last meeting of the Society. Only four patents have been noted dealing with the projection of pictures yielding relief effects; none of the patents represents essentially new principles.^^^
Non-Intermittent Projection. The number of patents and articles on continuous projectors appearing in the last few months indicates a renewed interest in this method of projection. LeventhaP^^ has published two papers, one of a general character considering the advantages of continuous projection and another describing in detail a new optical compensator. Another optical projector has been designed on a more elaborate scale by A. J. Holman.^^^ Mirrors have been eliminated in this projector, the bending of the light rays being accomplished entirely by refraction. Two other non-intermittent projectors have been announced although the descriptions given of them are rather meager.^^* Improvements in the design of the Mechau projector were described in a recent article. ^^^ Longer projection life for films is claimed by the manufacturers of this apparatus. A comparatively large number of patents have been granted relating to the design of continuous projectors.2i«
Portable Projectors. A combination projector and screen enclosed in an upright cabinet is finding commercial use for advertising purposes ; 16 mm. film in 1,000 foot reels is used.^^^ Another 16 mm. projector has been equipped with a carrying case fitted with a small translucent screen for use of the traveling salesman. ^^® A portable projector weighing 25 pounds and using 35 mm. film has been announced.^^^ Patent protection has been obtained by several inventors of portable projection equipment.^^°