Barber's Rule
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Barber, N. F. Proc. Leeds Phil. Lit. Soc. Sci. Sect. (1933), 2, 427-34. Unavailable.
When a circular electron beam is bent the cross section becomes elliptical with the center of the ellipse displaced by an amount which depends on the velocity of the electrons and the angle of deviation of the beam. The displacement of the center is greatest for angles of deviation in the range p/2 to 3p/4.
