 | Basil Jackson - 1847 - 410 páginas
...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,... | |
 | John F. Heather - 1849 - 208 páginas
...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... | |
 | Sir Henry Edward Landor Thuillier - 1851 - 826 páginas
...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,... | |
 | John Blenkarn - 1859 - 300 páginas
...withdrawn carefully, and when the tube is nearly level, or the water will be ejected with violence.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... | |
 | John Fry Heather - 1859 - 198 páginas
...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... | |
 | John Fry Heather - 1866 - 228 páginas
...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... | |
 | John Fry Heather - 1884 - 566 páginas
...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... | |
 | Thomas Baker - 1891 - 262 páginas
...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)... | |
 | John Fry Heather - 1891 - 260 páginas
...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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... 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... 