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" ... ball between two screens placed at a short distance from each other on the path of the projectile. For this purpose the observer is provided with a revolving cylinder, moved by clock-work at the rate of at least ten turns in a second, and of which... "
Military Commission to Europe in 1855 and 1856 - Page 125
by United States. Military Commission to Europe - 1861 - 232 pages
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A Memorial of Joseph Henry

United States. Congress - Electromagnetism - 1880 - 554 pages
...projectile. For this purpose the observer is provided with a revolving cylinder, moved by clock-work at the rate of at least ten turns in a second, and...a dot with printer's ink on the revolving surface. In the appendix to the paper he proposes to dispense with the galvanometer and produce the marks by...
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A Memorial of Joseph Henry

Smithsonian Institution - Electromagnetism - 1880 - 560 pages
...divided into a hundred equal parts, each part therefore indicating in the revolution the tBousandth part of a second. Close to the surface of this cylinder,...a dot with printer's ink on the revolving surface. In the appendix to the paper he proposes to dispense with the galvanometer and produce the marks by...
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Smithsonian Miscellaneous Collections, Volume 21

1881 - 856 pages
...projectile. For this purpose the observer is provided with a revolving cylinder, moved by clock-work at the rate of at least ten turns in a second, and...a dot with printer's ink on the revolving surface. In the appendix to the paper he proposes to dispense with the galvanometer and produce the marks by...
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Smithsonian Miscellaneous Collections, Volume 21

Smithsonian Institution - Chemistry - 1881 - 834 pages
...projectile. For this purpose the observer is provided with a revolving cylinder, moved by clock-work at the rate of at least ten turns in a second, and...a dot with printer's ink on the revolving surface. In the appendix to the paper he proposes to dispense with the galvanometer and produce the marks by...
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Smithsonian Miscellaneous Collections, Volume 21

Smithsonian Institution - Chemistry - 1881 - 850 pages
...at least ten turns in a second, and ot which the convex surface is divided into a hundred equal pate each part therefore indicating in the revolution the...a dot with printer's ink on the revolving surface. In the appendix to the paper he proposes to dispense with the galvanometer and produce the marks by...
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Biographical Memoirs, Volume 5

National Academy of Sciences (U.S.) - Scientists - 1905 - 372 pages
...projectile. For this purpose the observer is provided with a revolving cylinder, moved by clock-work at the rate of at least ten turns in a second, and...a dot with printer's ink on the revolving surface. In the appendix to the paper-he proposes to dispense with the galvanometer and produce the marks by...
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Leading American Men of Science

David Starr Jordan - Science - 1910 - 532 pages
...equal parts, each part therefore indicating in the revolution the thousandth part of a second or less. Close to the surface of this cylinder, which revolves...furnished at one end with a pen for making a dot with printers' ink on the revolving surface. In the appendix to the paper he proposes to dispense with the...
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