A
a1
X
5) Rotate the laser 90° counterclockwise so that the
intersection point pass through c1 on the table, and the
side 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 ).
X
c2
5 m
c1
X
2.5m
Figure # 7
C
b1
2.5m
B
X
21