 ... 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 14by John Browning (F.R.A.S.) - 1878 - 66 pagesFull view - About this book
 | 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... | |
 | 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... | |
 | 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... | |
 | 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,... | |
 | 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... | |
 | 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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