A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 81
Fig. 78. … A cross-section for a road may be taken in the same way. (96.) Burniers Level. It is a pear-shaped instrument, hav-ing two graduated circles; one vertical, having a weightattached so as to keep it in thesame vertical position when inuse; and the other, a horizontalgraduated circle, made light…
Surveying
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