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" ... to make the objects appear on the other wire ; if the contact still remains perfect, the axis of the telescope is in proper adjustment ; if not, it must be altered by moving the two screws which fasten, to the up-and-down piece, the collar into which... "
Practical Geodesy: Comprising Chain Surveying, and the Use of Surveying ... - Page 212
by Sir J Butler Williams - 1855 - 272 pages
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New American Practical Navigator

Nautical astronomy - 1821 - 708 pages
...the'sextant, and fix the index ; then, by altering a little the position of the instrument, make tlift image appear on the other wire ; if the contact still remains perfect, the axis of the telescope is in its right situation : but, if the limbs of the two objects appear to separate or lap over, at the wire...
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The New American Practical Navigator: Being an Epitome of Navigation ...

Nathaniel Bowditch - Nautical astronomy - 1826 - 732 pages
...sextant, and fix tue. index, then, by altering a little the position of the instrument, make the ímage appear on the other wire ; if the contact still remains perfect, the axis of the telescope is in its right situation; but, if the limbs of the two object's appear to separate or lap over, at the wire...
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The New American Practical Navigator: Being an Epitome of Navigation ...

Nathaniel Bowditch - Nautical astronomy - 1826 - 764 pages
...the sextant, and fix t indexa then, by altering n little the position of the instrument, make t image appear on the other wire; if the contact still remains perfect, the ;n •of the telescope is in its right situation; but, if the limbs of the two objet appear to separate...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - Astronomical instruments - 1834 - 124 pages
...are brought into contact just at the wire of the telescope which is nearest the plane of the sextant, fixing the index, and altering the position of the...This adjustment is not very liable to be deranged. Having now gone through the principle and construction of the sextant, it remains to give some instructions...
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Practical Geodesy: Comprising Chain Surveying, and the Use of Surveying ...

Sir J. Butler Williams - Geodesy - 1846 - 368 pages
...just at the wire of the telescope which is nearest the plane of the sextant (see diagram page 267), fixing the index, and altering the position of the...adjustment is not very liable to be deranged." OP THE USE OP THE SEXTANT. The large sextant is rarely required for observations (on land) of terrestrial or of...
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The New American Practical Navigator; Being an Epitome of Navigation ...

Nathaniel Bowditch - 1846 - 854 pages
...plane of the sextant, and fix the index; then, by altering a little the position of the instruinrnt, make the objects appear on the other wire ; if the contact still remains ]>erli;ct, the axis of tlie telescope is in its right situation ; but, if the limbs of the two objects...
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A Treatise on Military Surveying: Including Sketching in the Field, Plan ...

Basil Jackson - Military reconnaissance - 1847 - 410 pages
...are brought into contact just at the wire of the telescope which is nearest the plane of the sextant, fixing the index and altering the position of the...other wire : if the contact still remains perfect, the telescope is in proper adjustment ; if not, it must be altered by moving the two screws which fasten...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical, and ...

Benjamin Pike - Science - 1848 - 356 pages
...are brought into contact just at the wire of the telescope which is nearest the plane of the sextant, fixing the index, and altering the position of the...This adjustment is not very liable to be deranged. Of the sextant, it has been said, that it is in itself a portable observatory ; and it is doubtless...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical and ...

Benjamin Pike (Jr.) - Scientific apparatus and instruments - 1848 - 482 pages
...are brought into contact just at the wire of the telescope which is nearest the plane of the sextant, fixing the index, and altering the position of the...This adjustment is not very liable to be deranged. Of the sextant, it has been said, that it is in itself a portable observatory ; and it is doubtless...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - Astronomical instruments - 1850 - 184 pages
...are brought into contact just at the wire of the telescope which is nearest the plane of the sextant, fixing the index, and altering the position of the...objects appear on the other wire : if the contact still remain perfect, the axis of the telescope is in proper adjustment ; if not, it must be altered by moving...
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