Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 286
g areindicated in this manner. XIII, § 220] OTHER METHODS OF PROJECTION 267 Figure 247 shows a contour map which includes a lake, astream, and two hills. Contours are indicated at five-footintervals, starting from the lake level as the zero datum. Thecontour of the lake bottom is shown by dotted… … lio. 248 In Fig. 248 the same pivve of land is shown as in Fig. 247,but it has now been graded so as to give a flat space at level 25.The front part of this space is terraced up while at the backit is cut into the hills. In making contour maps, the engineer starts from some fixed and known point as…
Geometry, Descriptive
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