Finch, James Kip, 1883- · New York : John Wiley & Sons, Inc. · leaf 137
obtaining the elevation ofsuccessive points one from another. Obviously this verticaltraverse may be continued around and closed back on thestarting point, A, thus allowing us to check the error in the 116 CONTOUR MAPPING work. On the other hand a vertical traverse may be run asan open traverse… … Fig. 63.—Contour Interpolations Exercise. The difference in elevation between two points canbe determined most accurately by means of a level instrument.Such an instrument consists of a level bubble, by means ofwhich we can obtain a horizontal line of sight. Thus, in Fig.65 the difference in…
Cartography · Military maps
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