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" ... indigo), till it nearly reaches to the necks of the bottles, which are then corked for the convenience of carriage. On setting the stand tolerably level by the eye, these corks are both withdrawn, which must be done carefully, and when the tube is... "
Outline of the Method of Conducting a Trigonometrical Survey, for the ... - Page 81
by Edward Charles Frome - 1850 - 253 pages
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A Treatise on Military Surveying: Including Sketching in the Field, Plan ...

Basil Jackson - 1847 - 344 pages
...must be done carefully and when the tube is nearly level, or the water will be ejected with violence ; and the surface of the water in the bottles, being...which the vane of the levelling-staff is adjusted." A more recent invention of our clever neighbours, the French, is the " Reflecting-level, by Colonel Burel,...
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A Treatise on Mathematical Instruments: Including Most of the Instruments ...

John F. Heather - 1849 - 183 pages
...be done carefully, and when the tube is nearly level, or the water will be ejected with violence ; and the surface of the water in the bottles, being...direction the tube is turned, by which the vane of a levelling staff is adjusted." The instrument, however, with which observations upon the level of...
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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 - 718 pages
...must be done carefully and when the tube is nearly level, or the water will be ejected with violence) and the surface of the water in the bottles being...outside of c ' and d, by which the intersection of two cross-wires could be made to coincide with the surface of the water in each of the bottles ; or floats,...
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British Timber Trees

John Blenkarn - 1859 - 300 pages
...withdrawn carefully, and when the tube is nearly level, or the water will be ejected with violence. O and the surface of the water in the bottles, being...gives a horizontal line in whatever direction the table is turned, by which the vane of the levelling staff is adjusted. A slide could easily be attached...
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A Treatise on Mathematical Instruments: Including Most of the Instruments ...

John Fry Heather - 1859 - 198 pages
...be done carefully, and when the tube is nearly level, or the water will be ejected with violence ; and the surface of the water in the bottles, being necessarily on the same level, gives a hori zontal line in whatever direction the tube is turned, by which the vane of a levelling staff is...
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Treatise on Mathematical Instruments: Their Construction, Adjustment ...

John Fry Heather - 1866 - 228 pages
...be done carefully, and when the tube is nearly level, or the water will be ejected with violence ; and the surface of the water in the bottles, being necessarily on the same level, gives a hori zontal line in whatever direction the tube is turned, by which the vane of a levelling staff is...
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Mathematical Instruments: Their Construction, Adjustment, Testing and Use ...

John Fry Heather - 1884 - 580 pages
...be done carefully, and when the tube is nearly level, or the water will be ejected with violence ; and the surface of the water in the bottles, being...horizontal line in whatever direction the tube is turned. THE REFLECTING LEVEL. An instrument, however, with which observations upon the level of a country may...
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A Rudimentary Treatise on Land and Engineering Surveying: For Students and ...

Thomas Baker - 1891 - 231 pages
...carefully, and when the tube is nearly level, otherwise the water will be ejected from one of the bottles ; and the surface of the water in the bottles, being...direction the tube is turned, by which the vane of a levelling staff may be adjusted." LEVELLING STAVES. 6.) The best constructed levelling staff (Gravatt's)...
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Mathematical Instruments: Their Construction, Adjustment, Testing ..., Volume 3

John Fry Heather - 1891
...be dons D carefully, and when the tube is nearly level, or the water will be ejected with violence ; and the surface of the water in the bottles, being...horizontal line in whatever direction the tube is turned. THE REFLECTING LEVEL. An instrument, however, with which observations upon the level of a country may...
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