Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . Fig. 7. Fig. 72. 70 LIVING PICTURES. on a pivot (A, Figs. 71 and 72. This arm isperiodically tilted by a lever worked by the black camseen at the bottom of the drawings. In Fig. 71 anexposure has just commenced. The film is heldsteady by a light gripping frame, and the store reel isoccupied in rolling-up the slack portion of film. Whenthis is accomplished the cam causes the rocking-armto tilt, as seen in Fig. 72, thus drawing a fresh portionof film in front of the
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . Fig. 7. Fig. 72. 70 LIVING PICTURES. on a pivot (A, Figs. 71 and 72. This arm isperiodically tilted by a lever worked by the black camseen at the bottom of the drawings. In Fig. 71 anexposure has just commenced. The film is heldsteady by a light gripping frame, and the store reel isoccupied in rolling-up the slack portion of film. Whenthis is accomplished the cam causes the rocking-armto tilt, as seen in Fig. 72, thus drawing a fresh portionof film in front of the lens and then, suddenly returning to its first position,leaves a double loop ofslack to be stored awayexactly as seen in thepreceding figure. Afew days afterwardVarley filed a specifi-cation showing anothermeans for attaining thesame end as thatsecured by Evanssrocking - arm, namely,causing a loop to beformed in the film bymeans of intermittentpressure. The filmwas steadied by theaction of two spring-pawls which gripped it against two rollers (A, Fig. 73).By the revolution of a cam, not shown, an arm, B,was periodically thrown forwa
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
