Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . PRESENT-DAY APPARATUS. 153. NELSON S SPIRAL CAMERA (United States Patent No. 594,094). The plate is contained in a light-tight case (Fig. 167), having the lens midway on its vertical line. The plate may be moved from right to left across the lens by means of a screw on the driving-shaft, as seen in Fig. 168. At the same time it is intermittently rotated through the broken-screw K, and the Fig. 167. result of the combina-tion of these twomotions is the spiraldisposi
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . PRESENT-DAY APPARATUS. 153. NELSON S SPIRAL CAMERA (United States Patent No. 594,094). The plate is contained in a light-tight case (Fig. 167), having the lens midway on its vertical line. The plate may be moved from right to left across the lens by means of a screw on the driving-shaft, as seen in Fig. 168. At the same time it is intermittently rotated through the broken-screw K, and the Fig. 167. result of the combina-tion of these twomotions is the spiraldisposition of theseries of views on theplate. These seriesare somewhat short,but the preparation ofa positive for projec-tion purposes offers nomore difficulty thandoes the making of anordinary lantern-slide; there is no shrinkage to consider,and the system therefore has its advantages for theoccasional amateurs use. motograph moving picture book. Though not exactly depending upon persistence ofvision, this ingenious device (issued by Messrs. BHss,Sands, and Co.) may well be mentioned here, its effectbeing secured by a novel application of an old
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
