. Photographic pastimes : a series of interesting experiments for amateurs for obtaining novel and curious effects with the aid of the camera. he required sizesshould be cut and provided with thefollowing division: the radius of the circleis divided into nine parts of equal size,and from these points of division lines aredrawn to the centre of the circle. Thepictures are then mounted, so that eachtime their height exactly ends with theedge of the disc ; it is well to measureafterwards with a pair of compasses, inorder to ascertain that the different pic-tures are arranged at equal distances fr
. Photographic pastimes : a series of interesting experiments for amateurs for obtaining novel and curious effects with the aid of the camera. he required sizesshould be cut and provided with thefollowing division: the radius of the circleis divided into nine parts of equal size,and from these points of division lines aredrawn to the centre of the circle. Thepictures are then mounted, so that eachtime their height exactly ends with theedge of the disc ; it is well to measureafterwards with a pair of compasses, inorder to ascertain that the different pic-tures are arranged at equal distances fromthe centre of the disc. Then the centreof each picture must be mounted exactlyon one of the lines by which the circle isdivided into nine parts. Unless theserules are observed in mounting, a generalblurring will be produced, and there willconsequently be a want of clearness inthe pictures when showing them. 148 PHOTOGRAPHIC PASTIMES. As to the apparatus, an ordinary Stro-boscopic disc is sufficient for looking atthese pictures (figs. 53 and 54). In frontof the disc A (fig. 54) the pasteboard disc,on which the prints have been Figs. 53 and 54.—Stroboscopic View and Section. is placed, which is then rotated by meansof the handle B. If one looks thenthrough the disc A at the mirror C,rotating the disc at the same time by STROBOSCOPIC PICTURES. I49 means of the handle, the pictures will beperceived in rapid succession, and theimpression is given by it as if the subjectitself remained motionless, while thoseparts of the picture which represent thephenomenon of motion, in consequenceof the rapid rotation of the disc, give theimpression of real motion. Another Stroboscopic apparatus, whichserves the purpose even better, is shownin figs. 55, 56, and 57. X is a circulardisc, 23 centimetres in diameter, onwhich the Stroboscopic pictures are disc is furnished with two uprightrods, N N, to which the movable ring Ois fastened. The latter is provided w
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