The 1911 Catalogue of Scientific Apparatus published by W. G. Pye & Co. of Cambridge, England, lists Hibbert's Magnetic Balance at £1-1s. It had been developed by W. Hibbert of the Regent Street (London) Polytechnic, and relied on balancing magnetic forces against magnetic forces. The catalogue notes that the apparatus can be used for the following experiments:
The comparison of the pole strength of two or more magnets
The measurement of the intensity of the equatorial or axial field of a magnet
The measurement in C.G.S. units of Currents and ratios of current strengths
The measurement in C.G.S. units of pole strength
The magnetized ball on the right-hand side of the balance beam (with needle-point pivots) can be balanced against the magnetic field provided by the upper magnetized ball, or the current-carrying coil.
Our Coulomb balance is a recently made one supplied by Griffin & George
Canrom Photovoltaics Inc.
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