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" ... motion to the Y before spoken of, and consequently to the pivot of the axis which it carries. Having thus again bisected the object, reverse the axis as before, and if half the error was correctly estimated, the object will be bisected upon the telescope... "
An Elementary Treatise on Astronomy: In Four Parts. Containing a Systematic ... - Page 24
by William Augustus Norton - 1839 - 373 pages
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1834 - 124 pages
...the telescope the other half, which is done by turning the screw a : this gives the small azimuthal motion to the Y before spoken of, and consequently...bisected upon the telescope being directed to it; if not quite correct, the operation of reversing and correcting half the error, in the same manner, must...
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Practical Tunnelling: Explaining in Detail, the Setting Out of the Works ...

Frederick Walter Simms - 1844 - 248 pages
...other half, which is done by turning the screws cc, near the top of one of the arms of the iron stand. Having thus again bisected the object, reverse the axis as before, and if half the error has been correctly estimated the object will be bisected upon the telescope being directed to it ;...
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The New American Practical Navigator; Being an Epitome of Navigation ...

Nathaniel Bowditch - 1846 - 854 pages
...the other half, which is done by turning the azimuth screw a; this gives the small »/'u nú i lui! motion to the Y, before spoken of, and consequently to the pivot of the aiis which it carries. Having thus again bisected the object, reverse the axis as before, and, if half...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical, and ...

Benjamin Pike - 1848 - 356 pages
...the telescope the other half, which is done by turning the screw a ; this gives the small azimuthal motion to the Y before spoken of, and consequently...bisected upon the telescope being directed to it ; if not quite correct, the operation of reversing and correcting half the error, in the same manner, must...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical and ...

Benjamin Pike (Jr.) - 1848 - 482 pages
...the telescope the other half, which is done by turning the screw a ; this gives the small azimuthal motion to the Y before spoken of, and consequently...bisected upon the telescope being directed to it ; if not quite correct, the operation of reversing and correcting half the error, in the same manner, must...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1850 - 184 pages
...the telescope the other half, which is done by turning the screw, a ; this gives the small azimuthal motion to the Y before spoken of, and, consequently,...reverse the axis as before, and if half the error were correctly estimated, the object will be bisected upon the telescope being directed to it ; if...
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New American Practical Navigator

1880 - 880 pages
...telescope the other half, which is done by turning the a/iniuth screw a; this gives the small a/imuthal motion to the Y, before spoken of, and consequently...correctly estimated, the object will be bisected upon the télescope being directed to it; if not quite correct, the, operation of reversing and correcting half...
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