A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 517
n befound a convenience, asthereby the load may belightened and the instrumentitself more carefully carriedand more fully protected.Graduations on solid silver are apt to be tarnished by the pow-der-smoke of the mines.Some makers claim to ob-viate this by making thegraduations on platinum. If the…
Surveying
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