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 102
cular to the former. 3. By shades from vertical light. 4. By shades from oblique light. The most usual method is a combination of the first, second,and third systems. FIRST SYSTEM. 83 CHAPTER I. FIRST SYSTEM. BY HORIZONTAL CONTOUR-LINES. (133.) General Ideas. Imagine a hill to be sliced off by… … They are the same lines as would be formed by water sur-rounding the hill, and rising one foot at a time (or any otherheight), till it reached the top of the hill. The edge of the Fig. 97. Fig. 98. Fig. 99.
Surveying
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