Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . s 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 interm
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . s 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 forward against the film, ofwhich a sufficiency was driven back between the tworollers, A, to draw an exact picture-length arm then returned to its first position whilethe store-reel took up the slack so formed. The camseen in front works a double shutter by means of was also suggested that light should be allowed to. Fig. 73. CHRONO-PHOTOORAPliy. 71 act through four holes in a screen, forming marks atthe sides of each picture for the purpose of punchingholes in exact register. M. Marey, towards the end of 1890, constructed achrono-photographic camera in which a band passingfrom one spool to another was employed. Thisapparatus had been gradually evolved from one con-structed in the year 1888, having a ^^/>^r negative bandperiodically arrested by an electro-magnetic grip. In1889 the paper gave place to film, and a zoetropicinstrument combining views so obtained was exhibitedat the Paris Exhibition of that year, when M. Mareyshowed the apparatus to Mr. Edison. In 1890 themechanical details were finally arranged as shown in
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
