 Fig. 166. — 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....  A Treatise on Surveying - Side 75av Reginald Empson Middleton - 1904Uten tilgangsbegrensning - Om denne boken
 | W. Davis Haskoll - 1858 - 422 sider
...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 - 1882 - 356 sider
...(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,... | |
 | 1891 - 592 sider
...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 - 1898 - 1000 sider
...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 - 1900 - 190 sider
...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 - 1901 - 580 sider
...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 - 1902 - 638 sider
...instrument by means of the levelling screws s, s, Fig. 104, until the reading at B is correct. Now bring the bubble to the centre of its run by means of the adjusting capstan screws at e connecting the level with the telescope. See now if the reading of the... | |
 | C. F. Close - 1905 - 378 sider
...Telescope Level. — To make the telescope level parallel to the axis of revolution of the telescope in the Y's, and therefore parallel to the line of collimation, bring the bubble of the telescope level to the centre of its run bv means of two foot screws; reverse the telescope... | |
 | F. Noel Taylor - 1911 - 902 sider
...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... | |
 | F. A. Brining, D. N. Avasia - 1913 - 282 sider
...the capstan nuts placed there for that purpose. As half the error cannot be exactly estimated, again bring the bubble to the centre of its run by means of the foot screws, and repeat the operation until the bubble remains in the centre of its run in both positions... | |
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