. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. HISTORY OF CHRONOPHOTOGKAPHY. 319 ceedcd in tixiuii- in siu-cessivc instantaneous photographs all the phases of the gaits of a horse, even at the swiftest gallop. He studied by the same method the motions of man, as well as the principal types of quadruped locomotion. His arrangement was as follows: Multiple cameras, numbering from 12 to 24, according to circumstances, were arranged in series and pointed on a track where a horse was gallopi
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. HISTORY OF CHRONOPHOTOGKAPHY. 319 ceedcd in tixiuii- in siu-cessivc instantaneous photographs all the phases of the gaits of a horse, even at the swiftest gallop. He studied by the same method the motions of man, as well as the principal types of quadruped locomotion. His arrangement was as follows: Multiple cameras, numbering from 12 to 24, according to circumstances, were arranged in series and pointed on a track where a horse was galloping. Each camera had a quick-acting shutter worked by an electro-magnet. In passing along the track the horse successively broke a series of wires, each of which in breaking set free the shutter of one of the cameras. Things were so arranged that, as he passed along, the animal caused the successive production of a series of instantaneous photographs (fig. 3).'^ Muybridge\s method was, shortly after, used by Anschiitz, of Lissa, who seems to have made some improvements in it. In particular he S!l?ffiHS. Fui. 3. was favored by fortune in being able to use the newly discovered plates of gelatino-bromide of silver. Some tine series of photographs by Anschiitz were shown in the glass case. No. 3. ChronophotiHjrcq^Jiy on a j^lo^ie fixed hefore a camera ohscura^ Mareii^ 18S2.—The analysis of motion by chronophotography was alread}' worthy of attention in 1882, The apparatus was, however, too costly, while the measures of distances and times were defective, when the writer endeavored at once to simplify the experiments, and graphs? and how to project them in animated form is thoroughly explained and fig- ured in the patent of M. Ducos du Hauron; but the idea was entirely impracticable at the time. It may be added, in all these apparatus the perception of movement is due to the persistence of retinal impressions, which was the principle of Plateau's phenakisti- scope of 1833. *We plac
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