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about to determine by graphic methods the trajectories, velocities and accelerations of moving parts of the human body, acquiatic locomotion, etc. At first, he used plates but later, 1888, used "a long roll of sensitive film" intermittently fed past the exposure aperture. His work has a permanent value to science.
In 1887, Auchutz published^* a description of his tachyscope, a device which was later shown at the World's Fair, Chicago, 1893. The apparatus consisted of a glass wheel the pictures on which were lighted by the flash of a vacuum tube as they came into position; though the machine is the same as that described by Donisthrope, of London, in Nature, issue of January 24, 1878.
To concentrate a considerable length of entertainment on a convenient area a disc picture carrier was attempted by several inventors. In one scheme a glass plate was employed upon which series of pictures were spirally arranged, as in the Anthony device.
A British patent of 1900 to Rosenberg discloses another plan, a film having two rows of pictures thereon, each row being half of the whole show. At the end of the first row the film was shifted and run in the opposite direction to show pictures of the second row. Edison in his home projector of 1911 followed the same scheme.
The LePrince Patent
In 1886 Augustus Le Prince, of New York State, filed an application^-^ for U. S. Patent which disclosed transparent picture ribbons having a row of perforations along each edge of each film. Four such strips were used in the machine, four pictures being made on each in succession behind sixteen lenses. A single lens modification is suggested, with perforated film driven by a sprocketed drum.
It is curious that those who came nearest anticipating future accepted methods and mechanisms should have failed to follow up their work. As another shining example I might cite Mr. Levison, who publicly exhibited at the Brooklyn Photo Club an apparatus
^ ' Academy des Sciences, Comtes Rendus 1888, CVII, page 677-678.
Philadelphia Photographer 1887, p. 328-688. Serial No. 217,809; Patent No. 376,247.
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