Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . path of the film. Whenthe clamp was taken off, the spring returned to itsformer position, and in so doing drew forward morefilm. This arrangement involved the spring making a certain number ofvibrations per second,but the spring itself,by reason of its length,had a proper vibration,the rate of which veryseldom coincided withthe nun:iber of photo-graphs secured in onesecond. Consequentlythe spring acted some-times as a brake, some-times as an accelerator,and thus re
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . path of the film. Whenthe clamp was taken off, the spring returned to itsformer position, and in so doing drew forward morefilm. This arrangement involved the spring making a certain number ofvibrations per second,but the spring itself,by reason of its length,had a proper vibration,the rate of which veryseldom coincided withthe nun:iber of photo-graphs secured in onesecond. Consequentlythe spring acted some-times as a brake, some-times as an accelerator,and thus rendered thespacing of the pictures irregular. Also the little springclamp suffered from the same defect, thus intensifyingthe evil. A reference to Fig. 156 will show that theclamp P is now supported by a spring-frame, S, insteadof by a vibrating blade. The star-cam is replaced bya single one, C, while a pair of rollers bear very lightlyon the film before it reaches the tractive-spring F inorder to destroy the momentum of the film. Thesemodifications have rendered the machine perfectlyeffective in the matter of equal Fig. 156. PRESJENT-DA Y APPARATUS. 145
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
