Abstract

The “Helmholtz coil” is really a pair of coils so proportioned as to produce a magnetic field uniform in magnitude and direction over a large region. The theory of the magnetic field produced by such a coil is briefly developed and the final (series) formula is put into a form convenient for calculations. For ordinary applications only the field at the center is required. A convenient design, developed for obtaining soft x-ray potentials by determining the velocities of ejected photo-electrons, is described, and is further explained by photographs and drawings.

© 1926 Optical Society of America

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References

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Equations (14)

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