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" The lens c which is focussed by turning the milled ring M, produces an image of the bright line in the field of view by reflection... "
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
...adopted to make all measurements taken with instruments of this kind comparable with each other. Fig. 1 represents the upper part of the micro-spectroscope....is a glass plate, blackened with a fine clear white line across the centre at right angles to the tube. This line can perhaps be most neatly produced by...
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Monthly Notices of the Royal Astronomical Society, Volume 30

1870
...I shall now have the honour to describe. Fig. i represents the upper part of the star spectroscope. Attached to the side is a small tube, A A. At the...part of this tube is a glass plate, blackened with two fine clear white Fiy 1. lines across the centre, at an angle of 45°, like a letter X. These lines...
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Optics: Light and Sight Theoretically and Practically Considered, with Their ...

Edward Nugent - 1870 - 302 pages
...which is represented in section in Fig. 116. Attached to the upper part of the micro-spectroscope at the side is a small tube A A. At the outer part of this tube is a blackened glass plate E n, with two fine clear white lines crossing each other at an angle of 45°,...
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Discoveries and Inventions of the Nineteenth Century

Robert Routledge - 1893 - 732 pages
...he thus described in a paper read before the Microscopical Society : Attached to the side isasmall tube, A A. At the outer part of this tube is a blackened glass plate, with a fine clear white pointer in the centre of the tube. The lens, C, which...
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Discoveries and Inventions of the Nineteenth Century

Robert Routledge - 1896 - 719 pages
...construction and the use of which he thus described in a paper read before the Microscopical Society : Attached to the side is a small tube, A A. At the outer part of this tube is a blackened glass plate, with a fine clear white pointer in the centre of the tube. The lens,C, which...
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