Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . ord consisting ofseparate pictures. A largewheel, R, carried the sensitiveplate (making one revolutionin seventy-two seconds), and infront of it a disc, B, piercedwith twelve openings, madeone revolution in eighteen se-conds. Between these two wheels was placed a partitionS, pierced with a single opening. When the mechanismwas released, the motor-wheels, O, set both the sensitiveplate and shutter-disc in motion. The sensitive platemade the forty-eighth part of arev
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . ord consisting ofseparate pictures. A largewheel, R, carried the sensitiveplate (making one revolutionin seventy-two seconds), and infront of it a disc, B, piercedwith twelve openings, madeone revolution in eighteen se-conds. Between these two wheels was placed a partitionS, pierced with a single opening. When the mechanismwas released, the motor-wheels, O, set both the sensitiveplate and shutter-disc in motion. The sensitive platemade the forty-eighth part of arevolution and then stopped, thisbeing effected by a Maltese-crossmovement. At the moment of itsarrest one of the twelve openingsin B passed the fixed aperture P,thus making an exposure. Theplate moved on, while protectedby the opaque part of B betweentwo openings, and then stoppedfor the next exposure. Someinstruments of this kind weretaken by an English commission to the Andaman Islands in the follov/ing year (1875) ^^^the purpose of observing an eclipse of the sun, but theexpedition was unsuccessful owing to adverse CllRONOPHOTOGRAPHY. 69 Still at best the Photographic Revolver was but anobserving- instrument, and little could be done in theway of combining the distinct views into one motion ;forty-eight separate pictures at the rate of twelve persecond would only last the fifteenth part of a minute,and even then would compress the events of seventy-two seconds into that time. To obtain a longer series^Donisthorpe in 1876 further developed Du Monts ideaof rapidly dropping an exposed plate into a lowerchamber, so leaving the next free for exposure, andprovided a special gearing by which the shutter covered
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Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
