5) Rotate the laser clockwise so that the forward laser beam
passes through marks b1 on the table, and b2 on the wall B.
6) Mark the center of the side vertical beam at 2 locations. Point
c1 on the table near the laser, and point c2 on the wall C.
(see figure 11).
b2
X
22
B
b1
X
a1
X
Figure # 11
C
c1
X
c2
X