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MR. F. W. DYSON ON THE POTENTIAL OF AN ANCHOR RING.
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These five sets of formulas will be referred to as (A), (B), (C), (D), (E).
Section II.—The Potential of an Anchor Ring at an External Point.
§ 4. The potential of an anchor ring at a point on its axis may be easily found in several ways. One simple method is to divide the ring into elements by spheres, having the given point as centre.
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Let be a circle which by revolution round generates an anchor ring. Let be its centre, and let be perpendicular to .
With centre describe circles, dividing the circle into elements; let and be two of these circles.
By revolution of the figure round we obtain an anchor ring divided into elements.
Let