 | John Fry Heather - 1849 - 202 pages
...the vertical limb to the vernier plate over the compass box, the zero of this vernier may now be set to the zero of the limb, and the vertical limb will be in perfect adjustment. With an increase in the size of the theodolite a second telescope is placed beneath the horizontal... | |
 | Thomas Baker - Railroads - 1850 - 244 pages
...the right and to the left, and, if the bubble does not remain in the centre of its run, the level ss must be adjusted laterally by the screw at the other...the concise methods, I have given at page 318 of my Additions to the ninth edition of ' Nesbit's Surveying." TO TAKE A HORIZONTAL ANGLE WITH THE THEODOLITE.... | |
 | Cyclopaedia - 1852 - 258 pages
...of the vertical limb to the vernier-plate over the compass box, the zero of this vernier may be set to the zero of the limb, and the vertical limb will be in perfect adjustment. In large theodolites a second telescope is placed beneath the horizontal limb, for the purpose of detecting... | |
 | John Fry Heather - Angles (Geometry) - 1859 - 198 pages
...the vertical limb to the vernier plate over the compass hox, the zero of this vernier may now be set to the zero of the limb, and the vertical limb will be in perfect adjustment. With an increase in the size of the theodolite a second telescope is placed beneath the horizontal... | |
 | Thomas Baker (Civil engineer) - 1865 - 278 pages
...right and to the left, and, if the bubble does not remain in the centre of its run, the level .« s must be adjusted laterally by the screw at the other...and the vertical limb will be in perfect adjustment. NOTB. The adjustments of the theodolite here given are essentially the same 83 those given by Heather,... | |
 | John Fry Heather - Mathematical instruments - 1866 - 228 pages
...the vertical limb to the vernier plate over the compass box, the zero of this vernier may now be set to the zero of the limb, and the vertical limb will be in perfect adjustment. The second telescope, placed beneath the horizontal limb, serves to detect any accidental derangement... | |
 | William James Lloyd Wharton - Hydrographic surveying - 1882 - 416 pages
...the vertical limb to the vernier plate over the compass box, the zero of this vernier may now be set to the zero of the limb, and the vertical limb will be adjusted for horizontality. The vertical limb should move in a truly vertical plane. Any error can... | |
 | John Fry Heather - Scientific apparatus and instruments - 1884 - 566 pages
...the vertical limb to the vernier plate over the compass box, the zero of this vernier may now be set to the zero of the limb, and the vertical limb will be in perfect adjustment. The second telescope, placed beneath the horizontal limb, serves to detect any accidental derangement... | |
 | John Fry Heather - Astronomical instruments - 1891 - 260 pages
...the vertical limb to the vernier plate over the compass box, the zero of this vernier may now be set to the zero of the limb, and the vertical limb will be in perfect adjustment. The second telescope, placed beneath the horizontal limb, serves to detect any accidental derangement... | |
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... by means of the screw at its other end. This adjustment will probably disturb the first, and the whole operation must then be carefully repeated. By means of the small screw fastening the vernier of the vertical limb to the vernier plate over the... 