Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . intermediate rollerthe action would have beenconstant. This fact was soonrecognised, and M. Demeny in-corporated a new and importantmodification into his Germanand English patents applied foronly two months later—that isto say, in December, 1893. Thisdevelopment was not added tohis French patent until July,1894, and it is from this patent [that Fig. 82 is eccentric motion previouslyapplied to the bobbin was nowtransferred to an intermediateportion of
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . intermediate rollerthe action would have beenconstant. This fact was soonrecognised, and M. Demeny in-corporated a new and importantmodification into his Germanand English patents applied foronly two months later—that isto say, in December, 1893. Thisdevelopment was not added tohis French patent until July,1894, and it is from this patent [that Fig. 82 is eccentric motion previouslyapplied to the bobbin was nowtransferred to an intermediateportion of the mechanism, thusgiving an intermittent pull tothe film, constant in extent andregular in action. The film, after passing in front of the aperture, where it issteadied by friction rollers, is periodically struck byan eccentric rod or dog-motion, which draws downsufficient film to change the picture. The film ismeanwhile constantly passed on at a regular rate tothe store-reel by a sprocket-wheel. The specificationfurther suggests that the eccentric need not be a rod or roller, but may take the form of a blade,. Fig. 82. 84 LIVING PICTURES. and several devices of this kind are shown in Fig. dog-motion or pitman is so generally employed that it is only right to recognise the ®^-^ ^. name of Demeny as that of the\^) \V/ originator of this type of machine ;there does not appear to have beenF^- 83- any mention before 1893 of the motion used in the Chronophoto-graphe, though, considering the number of instancesin which vague suggestion has been found to have longpreceded practical application, it would probably besomewhat rash to definitely afhrm the statement. In November, 1893, Friese-Greene filed an Englishspecification chiefly re-markable for its resem-blance to Varleys in-vention of 1890 (). However, as thedrawing shows thecam-driven arm moreclearly, it is repro-duced in Fig. extraordinarysuggestions were madefor utilising the ap-paratus i
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
