International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 188
e the reverse of ridge lines. They areindicated by the water courses which follow or occupy them.They are the lines of greatest slope when looked at fromabove and of least slope when looked at from below. Onthese lines are found all the receding or reentering pointsof the contour lines. 1368. Forms… … Fig. 338. Fig. 339. 338, the direction in which water would flow being indicatedbv the arrows. 778 MAPPING. 2. Sloping np on all sides, i. e., a hollow, as shown inFig. 339. 3. Sloping dcnv)i on three sides, i. e., shoulder or prom-ontory; the end of a ridge or watershed line, as shown inFicr. 340.
Railroad engineering
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