Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . the methods proposed. It is well to devote some attention to the years 1869 and 1870; that is to say, the period immediately preceding- the firstattempts in chrono-photography. Twoforms of apparatus,casually quoted onpage 21, give a veryclear idea of thestage of progress thenattained; and theyare the more inter-esting inasmuch asthe instrument in-tended for use withdrawn designs shows a greater approximation to modern machines than does the one which employed photo
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . the methods proposed. It is well to devote some attention to the years 1869 and 1870; that is to say, the period immediately preceding- the firstattempts in chrono-photography. Twoforms of apparatus,casually quoted onpage 21, give a veryclear idea of thestage of progress thenattained; and theyare the more inter-esting inasmuch asthe instrument in-tended for use withdrawn designs shows a greater approximation to modern machines than does the one which employed photographs. Browns apparatus, shown in Figs. 47 and 48, depended on non-photographic images, of which a series was painted on a polygonal glass plate, P, and dropped into a holder somewhat similar to a magic-lantern slide. A gear - wheel, shown in Fig. 48, served to rotate the designs, and was itself revolved intermittently by pins contained in the lantern, with which it engaged when the slide was pushed home. These two pins projected from a disc and engaged periodically with a star-wheel, fromed in one piece with the gear-wheel. Fig. 48. CHRONO-PHOTOGRAPHY 47 which served to rotate the picture-disc; a motionwhich in an improved form is still frequently appliedto the modern moving band. A two-sector shutterwas geared to eclipse the light when either of the twopins caused the design-wheel to move. So far as can be traced, all photographic effortswere limited to posed subjects up to 1870 ; theFebruary of which year saw the exhibition of Pliasmatrope at the Academy of Music inPhiladelphia, and, though very successful, this apparatuswas based on the synthesis of poses and not cfanalytical photographs securedfrom a moving figure. Asshown in Fig. 49, the apparatusconsisted of a large wheel con-taining nine divisions, each ofwhich was furnished with twoopenings for the purpose ofcarrying transparencies. Thewhole disc could be revolved,step by step, by means of aratchet and pawl w
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
