Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . res were smaller, Mr. Edisonused a single line of perforations only. This endlessperforated band passed from one side of the spool-bankto the other through the upper chamber, being stretched over two sprocket-wheels (fitting theperforations), whichdrove the band pastthe inspection lensat a constant speedequal to forty-sixpictures per the band,and opposite theinspection opening,an incandescentlamp was situated;the American patentshows a peculiarform of
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . res were smaller, Mr. Edisonused a single line of perforations only. This endlessperforated band passed from one side of the spool-bankto the other through the upper chamber, being stretched over two sprocket-wheels (fitting theperforations), whichdrove the band pastthe inspection lensat a constant speedequal to forty-sixpictures per the band,and opposite theinspection opening,an incandescentlamp was situated;the American patentshows a peculiarform of alum-troughplaced between lensand film in order toabsorb heat, and also a prism arrangement for alteringline of sight. As the band was not arrested for theinspection of each picture, some means of providingmomentary illumination was necessary, and this wasaccomplished by a one-slot shutter making forty-sixrevolutions per second, so as to allow light to pass eachtime a picture was accurately centred. The mechanicalingenuity displayed in the accomplishment of this methodof intermittently illuminating a film continuously moving. Fig. 76. , 77
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
