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" ... perfect in both positions of the telescope, the line of collimation in altitude or depression is correct, but if not, the operation must be repeated carefully, until the adjustment is satisfactory. A similar proceeding will also put the vertical line... "
A Treatise on Surveying and Civil Engineering, Wherein Everything that is ... - Page 23
by P. O'Shaughnessy (Civil engineer) - 1848 - 98 pages
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A treatise on the principal mathematical instruments employed in surveying ...

Frederick Walter Simms - 1834 - 134 pages
...adjustment is satisfactory. A similar proceeding will also put the vertical line correct, or rather, the point of intersection, when there are two oblique...parallel to the rectified line of collimation. The clips, ii, being open, and the vertical arc clamped, bring the air-bubble of the level to the centre of its...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1836 - 160 pages
...adjustment is satisfactory. A similar proceeding will also put the vertical line correct, or rather, the point of intersection, when there are two oblique lines instead of a vertical one. turb the vertical arc, and if the bubble resume its former situation hi the middle of the tube, all...
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Trigonometrical Surveying, Levelling, and Railway Engineering

William Galbraith - 1842 - 216 pages
...not, the same operations must be repeated till it is so. 2. The second adjustment is that which places the level attached to the telescope parallel to the rectified line of collimation. The clips ZZ, being open, and the vertical arc PVP clamped, bring the air-bubble, N', of the level to the centre...
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A Treatise on Military Surveying: Including Sketching in the Field, Plan ...

Basil Jackson - 1847 - 412 pages
...while the telescope is turned round ; and the hairs are not properly adjusted till this is effected. The second adjustment is that which puts the level...parallel to the rectified line of collimation. The clips, ii, being open, and the vertical arc clamped by turning the screw, C, bring the air-bubble of the level...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical, and ...

Benjamin Pike - 1848 - 356 pages
...adjustment is satisfactory. A similar proceeding will also put the vertical line correct, or rather the point of intersection, when there are two oblique...parallel to the rectified line of collimation. The clips, ii, being open, and the vertical arc clamped, bring the air-bubble of the level to the centre of its...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical and ...

Benjamin Pike (Jr.) - 1848 - 484 pages
...adjustment is satisfactory. A similar proceeding will also put the vertical line correct, or rather the point of intersection, when there are two oblique...parallel to the rectified line of collimation. The clips, ii, being open, and the vertical arc clamped, bring the air-bubble of the level to the centre of its...
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A treatise on land surveying [ed.] by W. Galbraith

John Ainslie - 1849 - 586 pages
...not, the same operations must be repeated till it is so. 2. The second adjustment is that which places the level attached to the telescope parallel to the rectified line of collimation. The clips ZZ, being open, and the vertical arc PVP clamped, bring the air-bubble, X', of the level to the centre...
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A Manual of Surveying for India, Detailing the Mode of Operations on the ...

Ralph Smyth, Sir Henry Edward Landor Thuillier - 1851 - 828 pages
...adjustment is* satisfactory. A similar proceeding will also put the vertical line correct, or rather, the point of intersection, when there are two oblique...parallel to the rectified line of collimation. The clips, i, i, being open, and the vertical arc clamped, bring the air-bubble of the level to the centre of...
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Land and marine surveying

William Davis Haskoll - 1868 - 248 pages
...adjustment is satisfactory. A similar proceeding will also put the vertical line correct, or, rather the point of intersection, when there are two oblique...air-bubble of the level to the centre of its glass tube, by turning the tangent-screw, o, which being done, reverse the telescope in its Y'S ; that is, turn it...
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Land and Marine Surveying in Reference to the Preparation of Plans for Roads ...

William Davis Haskoll - 1886 - 354 pages
...adjustment is satisfactory. A similar proceeding will also put the vertical line correct, or rather the point of intersection, when there are two oblique lines instead of a vertical one. being done, reverse the telescope in its Y'S ; that is, turn it end for end, which must be done carefully...
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