Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . machine moves the film by mechanism shownin Fig. 125. It is supplied in two forms, the largerbeing electric-lit, the smaller serving rather for amateuruse. A pair of light ebonite rollers press the film onto the sprocket-wheel, which is made of aluminium. ACRES DUPLICATE APPARATUS. The camera (Fig. 176) is designed to procure a seriesof views by means of two lenses, such views beingarranged on the film in the order i, 3, 2, 4, 5, 7, 6, etc.,the film behind one lens
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . machine moves the film by mechanism shownin Fig. 125. It is supplied in two forms, the largerbeing electric-lit, the smaller serving rather for amateuruse. A pair of light ebonite rollers press the film onto the sprocket-wheel, which is made of aluminium. ACRES DUPLICATE APPARATUS. The camera (Fig. 176) is designed to procure a seriesof views by means of two lenses, such views beingarranged on the film in the order i, 3, 2, 4, 5, 7, 6, etc.,the film behind one lens being moved during exposurewith the other. The film is driven by two sprocket-rollers, A and A^, a loop being formed between crank drives a double-toothed rack backwards andforwards, thus rotating the sprocket-rollers, which, how-ever, can only turn in one direction, being preventedfrom moving backwards by a locking-ratchet. Thusin the illustration an exposure is proceeding with theleft-hand lens. As the slide C moves to the right, thesprocket-roller A will not be moved, but A^ will rotate PRESENT-DAY APPARATUS, 159. Fig. 176, and draw the loop B^ behind the right-hand lens. Sosoon as exposure with this begins the rack movesback to the left, and now it is sprocket-roller Aiwhich remains still while A draws off more film fromthe loop B and at the same time passes on sufficientfilm to re-form theloop W- between thelenses. It has alreadybeen pointed out thatcameras having adouble point of viewmust induce an ap-parent vibration offoreground objects onthe screen by reasonof the varying per-spective of alternate views, and, indeed, there appears to be little advantagein employing a duplicate system yb/ obtaining negativesunless it be so arranged that both systems work throughone objective, as in Fig. 86, or at least from one point of view. The greatneed is not that theviews should be photo-graphed without inter-val, but rather thatthey should be pro-jected without inter-venin
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
