15
6) Turn the laser 180° towards wall
B
. Reposition the laser and
verify that the 2 vertical lines pass through
a1
and
c1
.
7) Mark on wall
B
the center of the cross beams as
b1
(see figure # 2).
A
B
Figure # 1
C
a1
0.5m
c1
X
2m
X
approximately 5m
A
B
Figure # 2
C
a1
0.5m
c1
X
2m
b1
X
X
180°