PASCO AP-8215, Instruction Manual, Page: 8 / 24

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4
Vertical Adjustment of the Pendulum
The base of the pendulum should be flush with the floor of the
pendulum chamber. If it is not, adjust the height of the pendulum:
1. Grasp the torsion ribbon head and
loosen the Phillips retaining screw
(Figure 6a).
2. Adjust the height of the pendulum
by moving the torsion ribbon head
up or down so the base of the
pendulum is flush with the floor of
the pendulum chamber
(Figure 6b).
3. Tighten the retaining (Phillips
head) screw.
Leveling the Gravitational Torsion Balance
1. Release the pendulum from the locking mechanism by
unscrewing the locking screws on the case, lowering the
locking mechanisms to their lowest positions (Figure 4).
Figure 5
Using the leveling sight to level the
Gravitational Torsion Balance.
Look through the
sight to view the
reflection of the
pendulum bob in
the mirror.
Pendulum bob
must be
centered over
the mirror.
pendulum
mirror
torsion ribbon
torsion ribbon
head
Figure 4
Lowering the locking mechanism to release the pendulum bob arms
Turn locking
screws clockwise.
locking
mechanisms
pendulum
bob arm
2. Adjust the feet of the base until the pendulum is centered in
the leveling sight (Figure 5). (The base of the pendulum will
appear as a dark circle surrounded by a ring of light).
3. Orient the Gravitational Torsion Balance so the mirror on
the pendulum bob faces a screen or wall that is at least 5
meters away.
!
"
SIDE,
CUTAWAY
VIEW
"
!
Figure 6
Adjusting the height of the pendulum bob
The bottom of the pendulum
bob should be flush with the
floor of the chamber.
Grasp the torsion ribbon head
and loosen the Phillips screw.