Geological and topographical maps, their interpretation and use, a handbook for the geologist and civil engineer . 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 line BK, being at right angles to the strike, will of course be the direction of true BA mark off BL, equal to BE and join LK. The angle BKL will be the angle of dip. (c) Given the amount and direction of true dip, tofind the amount of dip in another given Let AB (Fig. 80) be
Geological and topographical maps, their interpretation and use, a handbook for the geologist and civil engineer . 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 line BK, being at right angles to the strike, will of course be the direction of true BA mark off BL, equal to BE and join LK. The angle BKL will be the angle of dip. (c) Given the amount and direction of true dip, tofind the amount of dip in another given Let AB (Fig. 80) be the direction of true dip and its amount 30°, required to find the amount of dip in the direction A draw DAE at right angles to AB. This will be the direction of AD mark off AF of any convenient length, and make the angle AFG equal to the complement of the angle of the apparent dip (in this case 60°).Through G draw a line parallel to DE, cutting AC in AK at right angles to AC and equal to AF, and join HK. The angle AHK will be the required dip. SOLUTIONS OF DIP PROBLEMS 107 (d) Given 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 mark off AE of convenient E make the angle AEF equal to the complement of the angle of dip (90°-30° = 60°).Through F draw a line GFH parallel to DAC,
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