![]() Data are then recorded as (for example) 25°->333° (dip and dip-direction) or (plunge and plunge-direction).įieldnotes can also include sketches, diagrams, and other drawings. ![]() One first reads the scale that shows the angle subtended by the lid of the compass, and then depending on the colour shown (red or black) the end of the compass needle with the corresponding colour. The side button is released and the needle is then firmly held in place, allowing the user thereafter to conveniently read the orientation measured. The needle of the compass is then freed by using the side button, and allowed to spin until the damping action slows its movement, and then stabilises. The compass must be twisted so that the base of the compass becomes horizontal, as accomplished using the spirit level incorporated in it. ![]() To use the compass one aligns the lid of the compass with the orientation of the surface to be measured (to obtain dip and dip direction), or the edge of the lid of the compass with the orientation of the line (to obtain plunge and plunge direction). ![]() This is because the compass is used to determine dip and dip-direction of surfaces (foliations), and plunge and plunge-direction of lines (lineations). At first sight it appears confusing to the novice user, for the numbers on the compass dial ascend in an anticlockwise direction.
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