The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 316
ace, the leathercover protecting the contents of the cup from be-ing washed out in raising the lead. A conical cav-ity in the lower end of the lead, lined with tallow,is often used, and it is found very efficient for in-dicating sand and mud. It is often very essential to knowwhether the bottom is… … Fig. 286 SURVEYING. the lead, and made of Italian hemp. It is prepared for use byfirst stretching it sufficiently to prevent further elongation inuse after it is graduated. Probably the best way to stretch aline is to wind it tightly about a smooth-barked tree, securelyfasten both ends, wet it…
Surveying
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