Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . e frontdisc is not obligedto serve the doublepurpose of escape-ment cam and the sprocket-wheelbe driven by a con-tained spring, thefront disc need haveno frictional actionon the ratchet-wheel^but will only serveto lift the pawl andallow the ratchet-v/heel to turn underthe action of thespring as often as acam-boss passes. Infact, this front discmay take the exact form of a ratchet-wheel with theteeth set the other way, the curved back of the teethacting as
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . e frontdisc is not obligedto serve the doublepurpose of escape-ment cam and the sprocket-wheelbe driven by a con-tained spring, thefront disc need haveno frictional actionon the ratchet-wheel^but will only serveto lift the pawl andallow the ratchet-v/heel to turn underthe action of thespring as often as acam-boss passes. Infact, this front discmay take the exact form of a ratchet-wheel with theteeth set the other way, the curved back of the teethacting as cams. The pawl will then be lifted as manytimes in a revolution as there are ratchet-teeth on thefront disc. B5. Film moved by intermittent grip of two rollers. Two early methods of obtaining an intermittentmotion from continually rotating rollers were suggestedby Evans in 1890. One suggestion was that the rollers,might be allowed to roll along the film for a time, thusleaving it stationary, and then be drawn back as shownin Fig. 70. Or the two rollers might periodically beheld apart and only permitted to grip the film for a. Fig. 131. APPARATUS. 123
Size: 1326px × 1884px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
