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" First, make the centre of the horizontal wire coincide with some well-defined part of a distant object; then turn the telescope half round in its Y's till the level lies above it, and observe if the same point is again cut by the centre of the wire ;... "
A Treatise on Surveying and Civil Engineering, Wherein Everything that is ... - Page 23
by P. O'Shaughnessy (Civil engineer) - 1848 - 98 pages
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A treatise on the principal mathematical instruments employed in surveying ...

Frederick Walter Simms - 1834 - 124 pages
...during an entire revolution of the telescope. The usual method of making this adjustment is as follows : First, make the centre of the horizontal wire coincide...Y's till the level lies above it, and observe if the same point is again cut by the centre of the wire ; if not, move the wire one half the quantity of...
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Practical Geodesy: Comprising Chain Surveying, and the Use of Surveying ...

sir J Butler Williams - 1846 - 368 pages
...vertically. This adjustment is effected as follows: — Make the intersection of the cross wires to coincide with some well-defined part of a distant...half round in its Y's, till the level lies above it ; if the same point be not then covered by the centre of the wires, move this centre one-half of the...
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A Treatise on Military Surveying: Including Sketching in the Field, Plan ...

Basil Jackson - 1847 - 412 pages
...the theodolite on its legs, and direct the telescope so that the centre of the horizontal hair shall coincide with some well-defined part of a distant object ; then turn the telescope in the Ys till the level is uppermost : observe then whether the horizontal hair still coincides with...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical, and ...

Benjamin Pike - 1848 - 356 pages
...during an entire revolution of the telescope. The usual method of making this adjustment is as follows : First, make the centre of the horizontal wire coincide...Y's till the level lies above it, and observe if the same point is again cut by the centre of the wire ; if not, move the wire one half the quantity of...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical and ...

Benjamin Pike (Jr.) - 1848 - 484 pages
...during an entire revolution of the telescope. The usual method of making this adjustment is as follows : First, make the centre of the horizontal wire coincide...Y's till the level lies above it, and observe if the same point is again cut by the centre of the wire ; if not, move the wire one half the quantity 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 - 828 pages
...adjustment is as follows : First, make the centre of the horizontal wire coincide with some well defined part of a distant object ; then turn the telescope...Y's till the level lies above it, and observe if the same point is again cut by the centre of the wire ; if not, move the wire one-half the quantity of...
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The Practice of Engineering Field Work, Applied to Land, Hydrographic, and ...

W. Davis Haskoll - 1858 - 324 pages
...question. To adjust the line of collimation. " First make the intersection of the horizontal wires coincide with some well-defined part of a distant object, then turn the telescope half round in its ' y-- till the level lies above it, and observe if the same point is again cut by the centre of the...
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Land and marine surveying

William Davis Haskoll - 1868 - 248 pages
...and also of the cross hairs of the diaphragm. We may now see about the actual line of collimation. First, make the centre of the horizontal wire coincide with some well-defined and motionless point in a distant object ; then turn the telescope half round in its Y'S, till the...
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Land and Marine Surveying in Reference to the Preparation of Plans for Roads ...

William Davis Haskoll - 1886 - 354 pages
...and also of the cross hairs of the diaphragm. We may now see about the actual line of collimation. First, make the centre of the horizontal wire coincide with some well.defined and motionless point in a distant object ; then turn the telescope half round in its Y'S, till the...
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