Gouy balance

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See also: Evans balance and Faraday balance
Schematic diagram of Gouy balance

The Gouy balance, invented by Louis Georges Gouy, is a device for measuring the magnetic susceptibility.

In use, a long, cylindrical sample to be tested is suspended from a balance, partially entering between the poles of a magnet. The balance measures the apparent change in the mass of the sample as it is repelled or attracted by the region of high magnetic field between the poles.[1] Some commercially available balances have a port at their base for this application.

In a practical device the whole assembly of balance and magnet is enclosed in a glass box to ensure that the weight measurement is not affected by air currents. The sample can also be enclosed in a thermostat in order to make measurements at different temperatures.[2]

References

  1. ↑ Saunderson, A. (1968). "A Permanent Magnet Gouy Balance". Physics Education 3 (5): 272–273. Bibcode:1968PhyEd...3..272S. doi:10.1088/0031-9120/3/5/007. 
  2. ↑ Earnshaw, Alan (1968). Introduction to Magnetochemistry. Academic Press. p. 89
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