The error consists in this;—that in proceeding with the leveling •operation along a line which is really level, the further end constantly appears, from the observation, to be the lower end ; and the amount of this depression appears to increase with...
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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