International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 198
rregular, it is often well to draw auxiliary-contours. An example of this system is given in Fig. 2 of Plate,Title: Contours and Slopes, which represents an abruptpromontory. Its base marks the channel of a river. Theground on the opposite side of the river is generally levelwith occasional… … Fig. 343.The preliminary work necessary for such a topographicalmap is as follows: A traverse or meander line is run, mark-ing the windings of the stream. Having platted thismeander line, the topographer takes his book containingthe sketch, and from the promontory itself sketches in themain…
Railroad engineering
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