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 119
(169.) Colored Topography. The conventional signs whichhave been described, as made with the pen, require much timeand labor. Colors are generally used by the French as sub-stitutes for them, and combine the advantages of great rapidityand effectiveness. Only three, colors (besides Indian-ink)…
Surveying
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