International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 189
in them. Where time and costare not to be considered, the lower sides of the contours maybe hatched as though water were draining off them, and thevalleys and low places tinted with a light shade of India ink.Sometimes the spaces between the contour lines are tintedwith India ink, increasing the… … Fig. 342. MAPPING. 779 with a lighter shade; from 12 feet to 18 feet with still lighter,and from 18 feet to 2-4 feet with lightest of all. Greaterdepths are marked in fathoms. 1370. Uses of Contours : 1. To locate roads. 2. To obtain vertical sections—profiles. 3. To calculate excavation and…
Railroad engineering
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