. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. HISTORY OF CHRONOPHOTOGKAPHY. 325 clockwork R, which h^l a lono- paper ril)hon over rollers. The rota- tion of the disk made an electric contact at each passage of a slit, in consequence of which an electro-magnet sijueezed the band and stopped it long enough for the exposure. Type h: It was necessary to avoid the extreme inconvenience of only being able to photograph within the dark room. A small porta- ble box, B, was therefore made for t
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. HISTORY OF CHRONOPHOTOGKAPHY. 325 clockwork R, which h^l a lono- paper ril)hon over rollers. The rota- tion of the disk made an electric contact at each passage of a slit, in consequence of which an electro-magnet sijueezed the band and stopped it long enough for the exposure. Type h: It was necessary to avoid the extreme inconvenience of only being able to photograph within the dark room. A small porta- ble box, B, was therefore made for the fillet, which, having been filled in the dark room, could be carried out with the rest of the chronophotographic apparatus, as shown in fig. 13. The results M'cre more satisfactory. Type c: intimately tlie application of electricity was given up, and the motion and stoppages of the film, instead of be- ing governed l)y an independent clock- work, were connected with the move- ments of the disk. ]Vo. 9. ])ouhle-action clwonopJiofo- (jraphy.—With a view of ol)taining an apparatus which should, at pleasure, either work upon a fixed plate or upon a moving film, an instrument was constructed represented l)y No. 9 in the glass case. This apparatus (fig. 14) is composed of a fore part, which slides in grooves. This fore part carries the objective and is cut so as to allow the shutter-disk to pass. The movement of the latter is governed by a rod of variable. Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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