In order to eliminate the recording of two directions, that of the strike and the dip, in field practice the writer has had installed in his Brunton compass a second and non-magnetic (aluminum) needle arm joined to the magnetized arm at 90°3 (Fig. 1). This arm is colored red. In using the compass the modern azimuth (360°) graduated circle is much to be preferred over the older quadrant type.
With the extra needle arm the strike is taken in the usual way, but it need not be recorded. Instead the red needle is read and entered in...
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