... amount, which could only have been detected by the second and independent series of levels, taken over the ground in an opposite direction. For this reason alone, I should not consider it safe to depend on one course of levels only, whatever may have...
Tables of Heights in Sind, the Punjab, N.W. Provinces and Central India ... - Page 13
de India. Great Trigonometrical Survey - 1863 - 196 pages
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