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" ... is out of adjustment, and requires correcting. The end to which the bubble retires must then be noticed, and the bubble made to return one.half the distance by turning the parallel plate screws, and the other half by turning the capstan.headed screw... "
A Treatise on Mathematical Instruments: Including Most of the Instruments ... - Page 101
by John Fry Heather - 1859 - 170 pages
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1834 - 134 pages
...not parallel to the optical axis, and requires correcting. The end to which the bubble retires must be noticed, and the bubble made to return one-half the distance by the parallel plate-screws, and the other half by the capstan-headed screw at the end of the level,...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical, and ...

Benjamin Pike - 1848 - 356 pages
...not parallel to the optical axis, and requires correcting. The end to which the bubble retires must be noticed, and the bubble made to return onehalf the distance by the parallel plate-screws, and the other half by the capstan-headed screw at the end of the level,...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical and ...

Benjamin Pike (Jr.) - 1848 - 482 pages
...not parallel to the optical axis, and requires correcting. The end to which the bubble retires must be noticed, and the bubble made to return onehalf the distance by the parallel plate-screws, and the other half by the capstan-headed screw at the end of the level,...
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A Rudimentary Treatise on Land and Enigineering Surveying with All the ...

Thomas Baker - 1850 - 244 pages
...correcting. The end to which the bubble retires must then be noticed, and the bubble made to return one half the distance by turning the parallel plate screws, and the other half by turning the capstain headed screws at the end of the bubble tube. The telescope must now again be reversed, and...
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A Manual of Surveying for India, Detailing the Mode of Operations on the ...

Sir Henry Edward Landor Thuillier - 1851 - 826 pages
...should the bubble not settle at the same point of the tube as before, it shows that the bubble tube is out of adjustment, and requires correcting. The...turning the capstan-headed screw at the end of the bubble tube. The telescope must now again be reversed, and the operation be repeated, until the bubble...
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Elementary Treatise on Land Surveying and Levelling ...

Robert Thornton (Engineer.) - 1863 - 144 pages
...the air bubble not settle in the same place or point of the tube as before, it shows the bubble tube is out of adjustment, and requires correcting. The...must then be noticed, and the bubble made to return one half the distance by turning the parallel plate screws, and the other half by turning the capstan-headed...
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A Practical Treatise on the Science of Land and Engineering Surveying ...

Henry S. Merrett - 1863 - 428 pages
...true to the axis of the tube, and requires adjustment. The end to which the bubble of air goes must be noticed, and the bubble made to return one-half the distance by the parallel plate screws H, and the other half by the screw F. This and the adjustment for the collimation...
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A practical treatise on ... land and engineering surveying, Volume 34

Henry S. Merrett - 1863 - 476 pages
...true to the axis of the tube, and requires adjustment. The end to which the bubble of air goes must be noticed, and the bubble made to return one-half the distance by the parallel plate screws H, and the other half by the screw F. This and the adjustment for the collimation...
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Rudimentary treatise on mensuration and measuring

Thomas Baker (C.E.) - 1865 - 174 pages
...should the bubble not settle in the same point of the tube as before, it shows that the bubble tube is out of adjustment, and requires correcting. The...parallel plate screws, and the other half by turning the capstain headed screws at the end of the bubble tube. The telescope must now again be-reversed, and...
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Mathematical Instruments: Their Construction, Adjustment, Testing and Use ...

John Fry Heather - 1884 - 566 pages
...correcting. The end to which the bubble retires must then be noticed, and the bubble made to return one -half the distance by turning the parallel plate screws,...bubble settles at the same point of the tube, in the centre of its run, in both positions of the instrument. The adjustment is then perfect, and the clips...
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