Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . Fig, 12! PRESENT-DA Y APFAHA TU8. 119. Fig. 126. B3. Fihn moved intermittently by raising and lowering sprocket-rollers. If the lower sprocket-roller maintains a fixed positionand is continually rotating, it will of course continue todraw down film. If, however, it be mounted as shownm Fig. 127, the action on thefilm may be rendered inter-mittent although the sprocket-wheel does not cease re-volving. The sprocket-axleis mounted eccentrically ona disc, the revolutio
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . Fig, 12! PRESENT-DA Y APFAHA TU8. 119. Fig. 126. B3. Fihn moved intermittently by raising and lowering sprocket-rollers. If the lower sprocket-roller maintains a fixed positionand is continually rotating, it will of course continue todraw down film. If, however, it be mounted as shownm Fig. 127, the action on thefilm may be rendered inter-mittent although the sprocket-wheel does not cease re-volving. The sprocket-axleis mounted eccentrically ona disc, the revolution of whichconsequently alternately raisesand lowers the sprocket-wheel. This latter receivesa rotary movement of its own through epicyclic gearing, and were its axle fixed,it would, as previously stated, draw the film down ata constant speed. The two movements are, however, so proportioned that theroller rises along the filmat the same rate as thesprocket-teeth rotate, andthe wheel itself merelytravels up the film. Onthe downward motion itnot only rolls the filmdown in the ordinaryway but also superaddsa drawing action due toits fall. This device, sosimilar to De
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
