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 435
und ivith the plane of reference—expressed in hun-dredths of an inch. The lines are made heavier as the slope is steeper, beingfine for the most gentle slopes, and increasing in breadthtill the blank space between them equals \ the breadth of thelines. Only slopes of from \ to -£T inclusive are… … 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…
Surveying
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