... 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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