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436 Transactions of S.M.P.E., Vol. XI, No. 31, 1927
In fact, after a group had been reading for 45 minutes and showed a loss in acuity of vision, they immediately viewed a picture for an hour and a half and demonstrated a gain in acuity. Therefore, it is recommended that if your brain and eyes are tired, "go to the movies." These experiments indicated in some instances a greater loss in acuity after viewing black and white pictures than after viewing colored pictures. ^^
Projectors
A new low-priced professional projector has been placed on the market in which is embodied everything in efficiency and construction that is found in more expensive tj^pes. Designed for a theater or hall of lOOO seats or less, it is equipped with a Mazda lamp and has been used to project a 16-foot picture at distances up to 135 feet.^^
A new gate mechanism has been developed for one of the leading makes of projectors now on the market. The chief feature of this new device is the fact that it is less affected by the high aperture temperatures of mirror and high intensity arc light sources. The mechanism consists of three heav}^ plates, a heavy grid kon plate facing the light source, another mounted upon and back of it which carries the gate latch, upper film shield and idler roller, and a steel plate wliich carries the tension shoes and springs.^"
A patent has been granted on a motion picture projector having an adjustable optical sj^stem adapting it for use with either ordinary films or films having separated color component images requiring separate optical paths. ^^ Another patent covers a motion picture projector which has two motion heads alternately illuminated by one light source. It is claimed that substantially the whole of the light is utilized during its transference from one head to the other. ^^
An improved cinematograph projector has been described in which an epicychc gear drives the maltese cross and intermittent sprocket, thus increasing the operating speed. ^°
A dissolving stereopticon using the reflector arc principle consists of an 8-inch parabolic mirror which intercepts the light from the usual horizontal carbon, directing it through two 5-inch diameter condensers, giving two beams for a side-by-side slide projection. ^^
A careful studj^ has been made of the factors relating to the dimensions of sprockets for motion picture apparatus in view of their standardization, and the correct sprocket diameters for film? of varioiis shrinkages were determined.^