Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . es mounted on slidingpanels (Fig. 90). A circular shutter, furnished with twoslots, each extending halfway round, revolves betweenlens and film. Presuming that exposure has just commenced with theright-hand lens, thecycle of operation isas follows. The filmdescends at a fixedrate, so also does thelens, it being drawndown by the crank-rod attached to thefront panel. Thelens does not, how-ever, travel at exactlythe same speed asthe film ; the movingparts are so geare
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . es mounted on slidingpanels (Fig. 90). A circular shutter, furnished with twoslots, each extending halfway round, revolves betweenlens and film. Presuming that exposure has just commenced with theright-hand lens, thecycle of operation isas follows. The filmdescends at a fixedrate, so also does thelens, it being drawndown by the crank-rod attached to thefront panel. Thelens does not, how-ever, travel at exactlythe same speed asthe film ; the movingparts are so gearedthat when used forprojection purposes aline connecting thecentre of the picture with the centre of the screenshall always pass through the optical centre of thelens. While this right-hand lens is descending, theleft-hand one is rising, but has no action on the filmbecause the light is cut off by the shutter. So soonas the lens begins its descent light is admitted to act,and at this time the position of affairs is such as todisplay the characteristics of the machine. One lenshas reached the bottom and is just terminating its. Fig. 90. 53J 2 Fic. 91, CIIRONOPHOTOGRAPHY. 9a exposure; the other lens is situated at half a pictureheight above and is just commencing to act. Theresult is shown in Fig. 91, where the two series ofpictures are seen side by side upon the film, the uppermargin of one picture being level withthe centre line of that which speed of the film is therefore re-duced to one-half, the alternating ex-posures or projections overlap, and allparts of the apparatus are in continualmovement. By these means it is claimedthat unsteadiness is avoided, while it iscertain there is no interruption of light either in camerawork or exhibiting. And now the turning-point in the History of theLiving Picture is reached. Up to this date the Kineto-scope was the only instrument of a distinctly popularnature, and it may be safely affirmed that, whatevermay have been done in
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
