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" ... 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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Report of the Annual Meeting

British Association for the Advancement of Science - 1839
...depend on one course of levels only, whatever may have been the precautions used to guard against error. The total length of my line of leveling between Portishead...stage was commenced. It is very remarkable, that with a few partial exceptions, the heigbts of all the points touched upon by both scries, came out less...
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Crocker's Elements of land surveying. To which are added, Tables of six ...

Abraham Crocker - 1841
...divided into separate stages, of an average length of about ten miles ; each of which was twice levelled over, first in one direction, and then in the opposite,...stage was commenced. It is very remarkable, that with a few partial exceptions, the heights of all the points touched upon by both series, came out less...
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