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8) Without turning the laser level, lock the pendulum and move
the laser level towards wall B and position it approximately
0.5 meter from wall B.
9) Turn on the pendulum to project all 3 lasers beams.
10) Verify that the vertical line passes through a1 and b1.
11) On wall B, mark the intersection point of the beams as
b2 (see figure # 3).
C
A
a1
x
12) Rotate the laser 180°. Reposition the laser and verify
that the 2 vertical lines pass through b2 and a1.
13) On wall A, mark the intersection point of the beams as a2
(see figure # 4).
2 m
Figure # 3
B
x
b1
b2
x
0.5 m
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