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" ... it was proposed to adopt a definition of the term which, right or wrong, should be recommended to the microscopists of the country as a convenient and uniform usage. The triangle method was proposed for general adoption, considering the angular aperture... "
The American Quarterly Microscopical Journal - Halaman 65
1878
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The American Naturalist, Volume 12

1878
...for general adoption, considering the angular aperture of a microscope objective to be the angle of the apex of a triangle having a base equal to the...adjusted for the most perfect definition in every case. While nearly all the members seemed to be personally in favor of the usage proposed, a motion that...
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The American Naturalist, Volume 12

1878
...for general adoption, considering the angular aperture of a microscope objective to be the angle of the apex of a triangle having a base equal to the...adjusted for the most perfect definition in every case. While nearly all the members seemed to be personally in favor of the usage proposed, a motion that...
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Journal of the Royal Microscopical Society, Volume 1

Royal Microscopical Society (Great Britain) - 1878
...understood (and, in fact, always has been) as a definition of angle of aperture, in a micro object-glass, is a triangle having a base equal to the available diameter of the front lens, and a height equal to the focal length measured therefrom. Now it is clear that if half the front lens is stopped off diametrically...
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The American Journal of Microscopy and Popular Science

1878
...aperture of a dry objective is measured by the angle at the apex of a triangle having a base eijual to the available diameter of the front lens, and a height equal to the actual focal length measured in air, with collar adjusted/or an uncovered object. Fig. 1. This is Mr. Wenham'e definition,...
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Journal of the Royal Microscopical Society, Volume 1

Royal Microscopical Society (Great Britain) - 1878
...understood (and, in fact, always has been) as a definition of angle of aperture, in a micro object-glass, is a triangle having a base equal to the available diameter of the front lens, and a height equal to the focal length measured therefrom. Now it is clear that if half the front lens is stopped off diametrically...
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Journal of the Royal Microscopical Society, Volume 1

Royal Microscopical Society (Great Britain) - 1878
...understood (and, in fact, always has been) as a definition of angle of aperture, in a micro object-glass, is a triangle having a base equal to the available diameter of the front lens, and a height equal to the focal length measured therefrom. Now it is clear that if half the front lens is stopped off diametrically...
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