Local attraction in compass surveying may exist due to
A. incorrect levelling of the magnetic needle
B. loss of magnetism of the needle
C. friction of the needle at the pivot
D. presence of magnetic substances near the instrument
Answer:D
Local attraction in compass surveying may exist due to
A. incorrect levelling of the magnetic needle B. loss of magnetism of the needle C. friction of the needle at the pivot D. presence of magnetic substances near the instrument