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" 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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Aid to Survey Practice for Reference in Surveying, Levelling, and Setting Out

Lowis D'Aguilar Jackson - 1880 - 382 pages
...long line that is really level, the further end constantly appears from the observation to be tfte lower end, and the amount of this depression appears to increase with the distance, the result of one's work showing the distant point to be always lower than it actually is. The difference...
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