| To measure the strike (an azimuth or bearing, relative to
North), a Brunton Pocket Transit ('Brunton') is used. It is possible to measure the strike
with any compass, Silva Rangers are used in many situations, but note that they work
slightly differently from a Brunton The long axis of
the Brunton, marked by the two extended sighting arms, is aligned with the chalk lines on
the outcrop. The Brunton must be held level, this is shown by the bull's eye level in the
base on the compass. It can be difficult at first to align the compass with the strikes,
and hold it level, but this will come with practice. |
