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Books Books 1 - 4 of 4 on ... by moving the telescope vertically, and read the two ends. Read the height of....  
" ... by moving the telescope vertically, and read the two ends. Read the height of the crosswires on the rod. Bring the bubble near the other end of tube and read both the bubble and rod. Repeat many times. Reduce the work by taking the half-difference... "
A treatise on surveying - Page 17
by Michael Thomas Morley Ormsby - 1902
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The Theory and Practice of Surveying: Designed for the Use of Surveyors and ...

John Butler Johnson - Surveying - 1880 - 703 pages
...distance of the centre of the bubble from the centre of the scale. readings in each case, thus giving the distance of the centre of the bubble from the centre of tube for each position. Take the mean of these results for each set of end readings separately. If...
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The theory and practice of surveying: designed for the use of surveyors and ...

John Butler Johnson - Technology & Engineering - 1886 - 730 pages
...times. Reduce the work by taking the half-difference of the two end readings in each case, thus giving the distance of the centre of the bubble from the centre of tube for each position. Take the mean of these results for each set of end readings separately. If...
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Problems in the Use and Adjustment of Engineering Instruments. Forms for ...

Walter Loring Webb - 1895 - 64 pages
...place in the tube for the telescope in either position. Under those condition^, the wyes are level and distance of the centre of the bubble from the centre of the tube is the error of adjustment. Record this distance measured in divisions of the bubble-tube. Make...
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A Treatise on Surveying, Volume 2

Reginald Empson Middleton, Osbert Chadwick, J. du T. Bogle - Surveying - 1902
...gave an image of the Sun, which could be comfortably observed. If this device is used, precept (6) is important on account of ' aberration.' The positions...altitude on the vertical arc, and vice versa. Example. 59i 56* Excess of O readings over E readings = 3-ggduations 4 Centre of bubble is therefore - - 1 fl...
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