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Books Books 1 - 2 of 2 on passes through the centre of the horizon-glass, meeting its surface at the same angle....
" passes through the centre of the horizon-glass, meeting its surface at the same angle as the line drawn from the same point to the centre of the index-glass. Hence a ray of light reflected from the centre of the index-glass to that of the horizon-glass... "
Plane astronomy - Page 85
by Alexander Ronald Grant - 1850
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Glossary of navigation

John Bradley Harbord - Naval art and science - 1883 - 421 pages
...furnish the means of adjusting the line of collimation of the telescope. This line of collimation, cc, passes through the centre of the horizon-glass, meeting...reflected along the line of collimation of the telescope. The collar is attached to a stem U, called the up-and-down-piece, by which the telescope may be raised...
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Glossary of Navigation: A Vade Mecum for Practical Navigators

John Bradley Harbord - Naval art and science - 1897 - 512 pages
...furnish the means of adjusting the line of colllmation of the telescope, This line of collimation, cc, passes through the centre of the horizon-glass, meeting...reflected along the line of collimation of the telescope. The collar is attached to a stem U, called the up-and-down-piece, by which the telescope may be raised...
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