If δ 1 and δ 2 are the angles of dip observed in two vertical planes at right angles to each other and δ is the true value of dip
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If δ 1 and δ 2 are the angles of dip observed in two vertical planes at right angles to each other and δ is the true value of dip If δ 1 and δ 2 are the angles of dip observed in two vertical planes at right angles to each [...]