22
5) Rotate the laser 90° counterclockwise so that the cross beams
pass through
c1
on the table, and the forward laser beam passes
through the marks
a1
and
b1
on the walls
A
and
B
respectively.
6) Mark as
c3
the center of the side vertical beam on wall
C
, at the
same height as point
c2
. (see figure # 8 ).
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