A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 368
n coincidence with any contour, the edge gf THE VERTICAL SYSTEM. 357 being normal to it, the slope to an adjacent contour can be readfrom the scale determined by the intersection of the radial lineswith gf. Instead of cutting the scale along gf, a pair of dividersmay be used to transfer distances.… … the curved hachures with a pencil at some distance apart as guides.When the contours are very far apart, as on nearly level ground,pencil in intermediate ones. Hachures in adjoining rows should not be continuous, but break joints, to indicate the places of the contour lines, which areusually…
Surveying
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