7) Rotate the laser clockwise so that the forward laser beam
passes through marks c1 on the table, and c2 on the wall C.
8) Mark the center of the side vertical beam at 2 locations. Point
d1 on the table near the laser, and point d2 on the wall D.
(see figure 12).
11
# תמונה
c2
X
C
c1
X
b1
X
Figure # 12
D
d1
X
a1
X
d2
X
23