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" H, the slide which holds the glass plate is made to travel in grooves, and the fine pointer is made to traverse the whole length of the spectrum. It might at first sight appear as if any ordinary spider's web or parallel wire micrometer might be used... "
How to work with the spectroscope - Page 45
by John Browning (F.R.A.S.) - 1878 - 66 pages
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The Monthly Microscopical Journal: Transactions of the Royal ..., Volume 3

1870 - 452 pages
...bright lines crossed at an angle of 45°, like a letter X. It might at first sight appear as if an ordinary spider's web or parallel wire micrometer...brought to focus and rendered visible. The bright line of the new arrangement possesses this great advantage—that it does not illuminate the whole...
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The Monthly Microscopical Journal: Transactions of the Royal ..., Volume 3

1870 - 384 pages
...an ordinary spider's web or girallel wire micrometer might be used instead of this contrivance, ut on closer attention it will be seen that as the spectrum...brought to focus and rendered visible. The bright line of the new arrangement possesses this great advantage—that it does not illuminate the whole...
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Optics: Light and Sight Theoretically and Practically Considered, with Their ...

Edward Nugent - 1870 - 302 pages
...cross is made to traverse the whole length of the spectrum. It might at first sight appear as if an ordinary spider's web or parallel wire micrometer...will be seen that, as the spectrum will not permit being magnified by the use of lenses, the line of such an ordinary micrometer could not be brought...
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Discoveries and Inventions of the Nineteenth Century

Robert Routledge - 1893 - 732 pages
...field of view by reflection from the surface of the prism nearest the eye. On turning the micrometer, M, the slide which holds the glass plate is made to...pointer of the new arrangement possesses this great advantage—that it does not illuminate the whole field of view. If a dark wire were used,the bright...
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Discoveries and Inventions of the Nineteenth Century

Robert Routledge - 1903 - 882 pages
...of view by reflection from the surface of the prism nearest the eye. On turning the micrometer, H, the slide which holds the glass plate is made to travel...that it does not illuminate the whole field of view. I fa dark wire were used, the bright FIG. 225.— Section of Micro-Spectro- diffused light would almost...
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