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" ... for that being constant, the result would in some measure be vitiated thereby. " When both the reflected and direct images require to be darkened, as is the case when the sun's diameter is measured, and when his altitude is taken with an artificial... "
A Treatise on Mathematical Instruments: Including Most of the Instruments ... - Page 143
by John Fry Heather - 1859 - 170 pages
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1834 - 124 pages
...diameter is measured and when his altitude is taken with an artificial horizon, the attached darkglasses ought not to be used : instead of them, those which...of the index, it must be removed, for the time, by taking out the finger- screw, which fastens it to the body of the circle. " If it should happen that...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1834 - 134 pages
...those errors, be less distinct than the latter. " In taking distances, when the position does not vajry from the vertical above thirty or forty degrees, the...of the index, it must be removed, for the time, by taking out the finger- screw, which fastens it to the body of the circle. " If it should happen that...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1844 - 178 pages
...or artificial horizon, they being no more than distances taken in a vertical plane. Meridian altithe same day, because there is not time : all therefore...of the index, it must be removed, for the time, by taking out the finger-screw, which fastens it to the body of the circle. " If it should happen that...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical, and ...

Benjamin Pike - 1848 - 356 pages
...observations, will be the true latitude ; but in these there should be no application of index-error, for that being constant, the result would in some...of the index, it must be removed, for the time, by taking out the finger-screw, which fastens it to the body of the circle. If it should happen that two...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical and ...

Benjamin Pike (Jr.) - 1848 - 482 pages
...observations, will be the true latitude ; but in these there should be no application of index-error, for that being constant, the result would in some...of the index, it must be removed, for the time, by taking out the finger-screw, which fastens it to the body of the circle. If it should happen that two...
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A Treatise on Mathematical Instruments ...

John Fry Heather - 1849 - 202 pages
...to read them off on different branches of the index. Also make three observations backwards, using the same caution ; a mean of these will be the distance...of the index, it must be removed, for the time, by taking out the finger screw, which fastens it to the body of the circle. " If it should happen that...
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A Treatise on Mathematical Instruments: Including Most of the Instruments ...

John F. Heather - 1849 - 208 pages
...thereby. " When both the reflected and direct images require to he darkened, as is the case when the sun-s diameter is measured, and when his altitude is taken...of the index, it must be removed, for the time, by taking out the finger screw, which fastens it to the body of the circle. " If it should happen that...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1850 - 184 pages
...forwards one day and backwards the next, and so on alternately from day to day : the mean of altitudes, deduced severally from such observations, will be...of the index, it must be removed, for the time, by taking out the finger-screw, which fastens it to the body of the circle. " If it should happen that...
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A Manual of Surveying for India, Detailing the Mode of Operations on the ...

Sir Henry Edward Landor Thuillier - 1851 - 826 pages
...observations, will be the true latitude ; but in these there should be no application of index-error, for that being constant, the result would in some...of the index, it must be removed, for the time, by taking out the finger-screw, which fastens it to the body of the circle. " If it should happen that...
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A Treatise on Mathematical Instruments: Including Most of the Instruments ...

John Fry Heather - 1851 - 208 pages
...application of index error, for that being constant, the result would in some measure be vitiated thereby. u When both the reflected and direct images require...of the index, it must be removed, for the time, by taking out the finger screw, which fastens it to the body of the circle. " If it should happen that...
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