Finch, James Kip, 1883- · New York : John Wiley & Sons, Inc. · leaf 139
of this kind is done with several types of instruments, thesimplest of which is the hand level. Such work, however,while accurate, is not rapid and is therefore not suited tosketch mapping. In sketch mapping the method followed is to determine 118 CONTOUR MAPPING the vertical angle of one point… … Fig. 65.—Spirit Leveling. is used. Several forms of clinometers have been devised bymeans of which the vertical angle can be quite accuratelyand rapidly measured, but the slope board is the simplestdevice available and though clumsy is quite as accurate asmost clinometers. The slope board is shown…
Cartography · Military maps
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