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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... "
A Manual of Surveying for India, Detailing the Mode of Operations on the ... - Page 149
by Sir Henry Edward Landor Thuillier - 1851 - 718 pages
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New American Practical Navigator

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 - 1826 - 732 pages
...sextant, and fix tue. index, then, by altering a little the position of the instrument, make the ¡mage 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 - 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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Practical Geodesy: Comprising Chain Surveying, and the Use of Surveying ...

Sir J. Butler Williams - 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...This 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...
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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 - 1847 - 410 pages
...more than the upper, so as to make his perpendicular diameter appear less than his horizontal one, which is that given in the "Nautical Almanac:" in...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 (Jr.) - 1848 - 482 pages
...the Sextant. — This is known to be correct, when the sun and moon, having a distance of 90 degrees or more, are brought into contact just at the wire...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 - 1848 - 356 pages
...the Sextant. — This is known to be correct, when the sun and moon, having a distance of 90 degrees or more, are brought into contact just at the wire...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 Complete Epitome of Practical Navigation ...

John William Norie - 1852 - 838 pages
...plane of the sextant, and fix the index ; then, by altering a little the position of the instrument, make the objects appear on the other wire. If the contact still remain perfect, the axis of the telescope is in its right situation ; but if the limbs of the two objects...
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An introduction to practical astronomy, Volume 12

Elias Loomis - 1855 - 514 pages
...is nearest the plane of the sextant. Fix the index, and alter the position of the instrument so as to make the objects appear on the other wire. If the...This adjustment is not very liable to be deranged. (133.) To measure the altitude of the sun by reflection from mercury. Set the index near zero. Hold...
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