. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 324 HISTORY OF CHRONOPHOTOGRAPHY. Still, it was desirable to multipl}^ the images while showing the whole bod}'. For that purpose the insufficiency of the advance of the subject has to be made up for by a displacement of the image on the plate. This can be brought about in several ways. In the first place, the camera, with its attachments, can be pivoted on its support and caused to turn about a vertical axis. The difficult}^ of moving the
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 324 HISTORY OF CHRONOPHOTOGRAPHY. Still, it was desirable to multipl}^ the images while showing the whole bod}'. For that purpose the insufficiency of the advance of the subject has to be made up for by a displacement of the image on the plate. This can be brought about in several ways. In the first place, the camera, with its attachments, can be pivoted on its support and caused to turn about a vertical axis. The difficult}^ of moving the considerable mass uniformly caused, however, the abandonment of this method in favor of the rotation of a mirror T)y clockwork, causing the reflection to strike different points of the plate. In this way a series of complete photographs are obtained, following one another at extremely short intervals of time. Indeed, the frequenc}^ of the photographs may be made very great. Their total number is, how- ever, restricted because the optical axis of the instrument, being dis-. FlG. 12. placed along the black background, soon reaches the end of it. A final solution was to take the photographs upon difi'erent points of a long fillet which moves along the focal plane of the camera and is stopped long enough for each exposure. Chronojyhotography on a Jilm rihhon, Morey^ 1887: In consequence of the invention of the kodak, long paper fillets of gelatino-bromide of silver had become articles of commerce. A little later transparent films made their appearance; and these were still more appropriate for the chronophotography of long series of pictures. Three patterns of apparatus were exhibited in the case under No, 8. These showed the successive steps of invention. Type a: The apparatus (fig. 12) worked in the red light of the dark room. The objective was pointed outward across a conical shade. In the place of the ordinary plate-holder was placed a shelf carrying a. Please note that these i
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