The design of a spherical coil system to produce a region of uniform magnetic field is discussed. The construction of a set of spherical coils is described, and it is shown that a field uniformity of one part in ten thousand is obtained throughout a region having two-thirds the radius of the sphere. Comparison with the Helmholtz coil array shows that a suitably designed spherical coil carrying 100 turns of wire is equivalent to a Helmholtz coil system having a radius more than seven times greater.
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Everett et al. (1966) studied this question.
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