. The elements of railroad engineering . FIG. 351. MAPPING. ^ni distance from the shore Hne, a parallel line is drawn, and alittle further removed a second parallel, and so on, as inFig. 351. An abrupt and rocky shore is shown in Fig. 352. Theirregular dotted surfaces surrounded by shore lines represent. Fig. ■.}5-i. sand bars. The dotted outlines beyond the shore linesrepresent either shoals or sunken rocks.

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering