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 436
BY SHADES FROM VERTICAL LIGHT. 421 For the intermediate slopes, he makes the white to the black in thefollowing proportion : The ivhite : the Hack : : 45° — angle of slope : angle of slope. For example, for 30° : light : shade : : 45° — 30° : 30° : : 1 : 2. Hence, the space between the strokes is… … steeper than 45° are represented by short, heavy lines, parallel tothe contour-lines, as shown in the upper right-hand corner of Fig,455—a hill drawn by Lehmanns method. 644. Another Diapason of Tints: 422 TOPOGRAPHY. Slope 2|° 5° 10° 15° 25° 35° 45° 60° 75° Black 1 2 3 4 5 6 7 8 9 White . 10 9 8 7…
Surveying
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