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 432
are drawn perpendicularly to thecontour-lines, and are the lines of greatest slope. They arecalled hatchings. Fig. 452 represents Fig. 452. an oval hill by thissystem. 636. SketchingGround by this System. This is rapid andeffective, but not pre-cise. In doing this,hold the book to cor-respond with… … 637. Details of Hatchings. They must be drawn very truly per-pendicular to the contour-lines. But if the contour-lines are notparallel, the hatchings must curve. In finishing drawings, sketchin the curved hatchings with a pencil at some distance apart asguides. When the contours are very far apart,…
Surveying
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