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" ... determined by repeating the observation of an altitude or depression in the reversed positions, both of the telescope and the vernier plate : the two readings will have equal and opposite errors, one half of their difference being the index error. "
A Treatise on Surveying and Civil Engineering, Wherein Everything that is ... - Page 25
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
...half of their difference being the index error. Such a method of observing angles is decidedly the best, since the mean of any equal number of observations...error that may exist in the adjustment of the vernier, or zero of altitude. The theodolite, as constructed in the manner we have described, is not inconveniently...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1844 - 190 pages
...one-half of their difference being the index error. Such a method of observing angles is decidedly the best, since the mean of any equal number of observations taken with the telescope reversed in its T's, must be free from the effects of any error that may exist in the adjustment of the vernier, or...
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A Treatise on Military Surveying: Including Sketching in the Field, Plan ...

Basil Jackson - 1847 - 412 pages
...one half of the difference being the index error. Such a method of observing angles is decidedly the best, since the mean of any equal number of observations, taken with the telescope reversed in its Ys, must be free from the effects of any error that may exist in the adjustment of the vernier or zero...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical, and ...

Benjamin Pike - 1848 - 356 pages
...half of their difference being the index error. Such a. method of observing angles is decidedly the best, since the mean of any equal number of observations...error that may exist in the adjustment of the vernier, or zero of altitude. The theodolite, as constructed in the manner we have described, is not inconveniently...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical and ...

Benjamin Pike (Jr.) - 1848 - 484 pages
...half of their difference being the index error. Such a method of observing angles is decidedly the best, since the mean of any equal number of observations...error that may exist in the adjustment of the vernier, or zero of altitude. The theodolite, as constructed in the manner we have described, is not inconveniently...
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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
...one-half of their difference being the index error. Such a method of observing angles is decidedly the best, since the mean of any equal number of observations...error that may exist in the adjustment of the vernier, or zero of altitude. The Theodolite, as constructed in the maiiner we havedescribed, is not inconveniently...
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Land and marine surveying

William Davis Haskoll - 1868 - 248 pages
...half of their difference being the index error. Such a method of observing angles is decidedly the best, since the mean of any equal number of observations taken with the telescope reversed in its T'S must be free from the effects of any error that may exist in the adjustment of the vernier, or...
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Land and Marine Surveying in Reference to the Preparation of Plans for Roads ...

William Davis Haskoll - 1886 - 354 pages
...half of their difference being the index error. Such a method of observing angles is decidedly the best, since the mean of any equal number of observations...error that may exist in the adjustment of the vernier, or zero of altitude. The theodolite, as constructed in the manner we have described, is not inconveniently...
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