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" ... telescope is moved through any angle it causes the last prism to turn through double that angle. The rays which issue from the centre of the last prism are thus made to fall perpendicularly upon the centre of the object-glass of the telescope, T,... "
How to work with the spectroscope - Page 14
by John Browning (F.R.A.S.) - 1878 - 66 pages
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Monthly Notices of the Royal Astronomical Society, Volume 30

1870
...perpendicularly upon the centre of the object-glass of the telescope, T, and thus the ray of light travels parallel to the bases of the several prisms,...Thus the apparatus is so arranged that on turning the micrometer-screw, so as to make a line in the spectrum coincide with the cross-wires in the eye-piece...
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The Quarterly Journal of Science, Volume 8

1871 - 600 pages
...perpendicularly upon the centre of the object-glass of the telescope, T, and thus the ray of light travels parallel to the bases of the several prisms,...Thus the apparatus is so arranged that on turning the micrometer-screw, so as to make a line in the spectrum coincide with the cross wires in the eye-piece...
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Quarterly Journal of Science, and Annals of Mining, Metallurgy ..., Volume 8

James Samuelson, William Crookes - 1871 - 614 pages
...perpendicularly upon the centre of the object-glass of the telescope, T, and thus the ray of light travels parallel to the bases of the several prisms,...Thus the apparatus is so arranged that on turning the micrometer-screw, so as to make a line in the spectrum coincide with the cross wires in the eye-piece...
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Report of the ... Meeting of the British Association for the ..., Volume 40

British Association for the Advancement of Science - 1871 - 720 pages
...perpendicularly upon the centre of the object-glass of the telescope T ; nnd thus the ray of light travels parallel to the bases of the several prisms,...optical axis of the telescope itself, and thereby tho whole field of tin 1 object-glass is lilled with light. Thus the apparatus is so arranged that,...
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Report of the ... Meeting of the British Association for the ..., Volume 40

British Association for the Advancement of Science - 1871 - 714 pages
...fall perpendicularly upon the centre of the object-glass of the Iclcscope T; and thus the ray of light travels parallel to the bases of the several prisms,...ultimately along the optical axis of the telescope itself, nnd thereby the whole field of the object-glass is filled with light. Thus the apparatus is so arranged...
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Journal of the Franklin Institute

1871 - 642 pages
...centre of the object glass of the telescope, T, and thus the ray of light travels parallel to the basis of the several prisms, and ultimately along the optical...Thus the apparatus is so arranged that on turning the micrometer screw, so as to make a line in the spectrum coincide with the cross wires in the eye-piece...
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