Geological and topographical maps, their interpretation and use, a handbook for the geologist and civil engineer (1911)
Dwerryhouse, Arthur Richard, 1867- · London, E. Arnold · leaf 119
Fig. 79. 106 GEOLOGICAL AND TOPOGRAPHICAL MAPS complement of the angle of the observed dip (90°-30° = 60°).Through F draw GFH parallel to ABC, and from B draw BK at right angles to AB.The line BK, being at right angles to the strike, will of course be the direction of true dip.Upon BA mark off BL,… … Let AB (Fig. 80) be the direction of true dip and its amount 30°, required to find the amount of dip in the direction AC.Through A draw DAE at right angles to AB. This will be the direction of strike.On AD mark off AF of any convenient length, and make the angle AFG equal to the complement of the…
Cartography · Geology · Topographical drawing
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