Fig. 4 Mounting of torsional pendulum with scale as viewed from above
1
Fig. 5 Set-up of laser pointer for determining zero position (1 wall, 2 laser, 3 mirror)
4.7 Experimental procedure
Place the large lead spheres on the outer support
beam at position 1 (see Fig. 6) and wait till the
vibration has settled down (by observing the laser
pointer). Calibrate the zero point if necessary.
Move the outer beam to position 2 and start the
measurements.
Fig. 6 Positions of outer support beam (as seen from above) Left: Position 1, Centre: Position 2, Right: Position 3
3
2
When the small spheres have almost reached their
equilibrium point, move the outer beam to position
3.
Once the small spheres have almost reached their
new
equilibrium
measurement.
Save the plot of the measurements.
5
position,
then
stop
the