 | W. Davis Haskoll - Civil engineering - 1858 - 422 pages
...level parallel to the line of collimation. The clips b, b, being open, and the vertical arc clamped, bring the bubble to the centre of its run by means of the tangent screw O ; this done, carefully lift the telescope out of its " ys," and turn it end for end.... | |
 | J. L. Robinson - Boats and boating - 1882 - 356 pages
...(as the cylindrical rings on which it rests are called) being opened, and the vertical arc clamped, bring the bubble to the centre of its " run " by means of the tangent screw (N) of the vertical arc. This done, carefully turn the telescope end for end in its Y's,... | |
 | Engineering - 1891 - 592 pages
...over either pair of opposite leveling screws, and having locked the telescope in the wyes, proceed to bring the bubble to the centre of its run by means of the two leveling screws under the level bar. Now turn the telescope carefully halfway round on its axis,... | |
 | Caleb Pamely - Coal mines and mining - 1898 - 1000 pages
...telescope will be assumed to be at first placed. The level tube is now brought to adjustment by bringing the bubble to the centre of its run by means of the parallel plate-screws, aa', by taking the milled heads of these screws, one between the balls of the... | |
 | Neil Kennedy - Surveying - 1900 - 190 pages
...perpendicular to the vertical axis. Place the level parallel to two corresponding levelling screws ; bring the bubble to the centre of its run by means of the levelling screws ; turn the instrument through 180 degrees ; assuming that the bubble is not now in... | |
 | William Ford Robinson Stanley - Surveying - 1901 - 580 pages
...telescope will be assumed to be at first placed. The level tube is now brought to adjustment by bringing the bubble to the centre of its run by means of the parallel plate screws a a', by taking the milled heads of these screws, one between the balls of the... | |
 | John Whitelaw - Surveying - 1902 - 638 pages
...between A and B, compute from the last staff reading at A what C Fig. 165.— Adjustment of Level. d AB Fig. 166. — Adjustment of Level. the staff reading...the reading at A is altered, the correct reading at B must be again computed from it, and the instrument made to read this by again depressing or raising... | |
 | John Whitelaw - Surveying - 1902 - 568 pages
...from the last staff reading at A what A ACB Vig. 165.—Adjustment of Level. Fig. 166.—Adjustment of Level. the staff reading at B should be. If now...the reading at A is altered, the correct reading at D must be again computed from it, and the instrument made to read this by again depressing or raising... | |
 | Reginald Empson Middleton - Surveying - 1904 - 332 pages
...level parallel to the axis of rotation in its Y's, and therefore parallel to the line of collimation. Bring the bubble to the centre of its run, by means of the foot-screws. Reverse the telescope end for end, in its Y's, when, if the bubble does not remain in... | |
 | F. Noel Taylor - Civil engineering - 1911 - 902 pages
...11-85. If not, by means of the level screws shift it off level till this reading be attained, and then bring the bubble to the centre of its run by means of the level capstan screws. 2. And to make the collimation line coincide with the axis of the telescope (refer... | |
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Adjustment of Level. the staff reading at B should be. If now the actual staff reading at B does not agree with this, raise or depress the whole instrument by means of the levelling screws s, s, Fig. 104, until the reading at B is correct. Now bring the... 
