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transfer points.
(1) Set up the instrument in the mine and tum
Fig. 10
A
C
on the upward laser, move the instrument until
D
the laser collimating the point C.
(2) Turn on the downward laser, the laser spot
B
on the mine ground point E is related to point
C.
(3) Repeat (1) to collimate the point D and get
the point F as step (2).
(4) Connect the point E and point F, the
azimuth of line EF is same as line AB.
(5) Following the above procedure can achieve
other similar survey.
E
F
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