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 120
n the direction and amount of true dip, to find the direction in which the dip will be of a given amount (of course less than true dip).Let AB (Fig. 81) be the direction of dip, and let its amount be 30°. Required the direction in which the dip will be 20°.Through A draw the strike line DAC, and… … At K make the angle AKL equal to the complement of the required dip (90° - 20° = 70°).With A as centre, and radius AL, draw an arc of a circle cutting GH in M and N.Join AM and AN. AM and AN will be the required directions, in which the dip will be 20°. (e) Given the depth at which a stratum, say a…
Cartography · Geology · Topographical drawing
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