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Fig. 1 Components of a Cavendish torsion balance
1 Adjustable feet, 2 Outer supporting beam for large lead spheres, 3 Capacitive differential sensor, 4 USB port, 5 Centring rod,
6 Inner supporting beam for small lead spheres, 7 Lower suspension rod with mirror, 8 Tungsten wire, 9 Upper suspension rod,
10 Rotatable mounting with protractor scale
2. Equipment supplied
1 Housing with glass plates
1 Roll of tungsten wire
1 Lower suspension rod with mirror
1 Upper suspension rod
1 Inner support beam
1 Centring rod
1 Aluminium rod with thread
2 Small lead spheres
2 Large lead spheres
1 Measurement software
1 USB lead
3. Technical data
Mass of large spheres:
Mass of small spheres:
Gravitational force:
Torsion wire:
Period of oscillation:
Angle resolution:
Sampling rate:
Dimensions:
Weight
2
10
9
8
7
3
6
5
4
3
2
1
each 1 kg approx.
each 15 g approx.
–9
< 10
N
Tungsten, 25 µm
2 – 4 mins
25 µrad
0.5, 1, 2, 5, 10 samples/s
19 x 18 x 20 cm approx.
5 kg approx.
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