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" ... returning upon any part of it ; it being much more probable that errors depending on the state of the atmosphere will balance each other in the former than in the latter case. My own experience, therefore, leads to the conclusion, that no levelling... "
Tables of Heights in Sind, the Punjab, N.W. Provinces and Central India ... - Page 14
de India. Great Trigonometrical Survey - 1863 - 196 pages
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Report of the Annual Meeting

British Association for the Advancement of Science - 1839
...experience, therefore, leads to the conclusion, that no levelling can be expected to give a correct result, unless it be performed in opposite directions, and the mean of both results be taken ; instead of depending, as Captain Lloyd appears to have done, on the consistency of separate sets...
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Crocker's Elements of land surveying. To which are added, Tables of six ...

Abraham Crocker - 1841
...experience, therefore, leads to the conclusion, that no levelling can be expected to give a correct result, unless it be performed in opposite directions, and the mean of both results be taken, instead of depending, as Captain Lloyd appears to have done*, on the consistency of separate sets of...
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