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 117
omabove. The nature of the rocks, or the geology of the country,may be shown by applying the proper colors, as agreed on bygeologists, to the back of the map, so that they may be seenby holding it up against the light, while they will thus notconfuse the usual details. (167.) Signs for Vegetation.… … lower and right-hand sides, and to represent their shadows, as in thefigure, though, in strictness, this isinconsistent with the hypothesis ofvertical light, usually adopted for hill-drawing. . For pineand similar forests, the signs may have a star-like form, as onthe right-hand side of the figure.…
Surveying
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