Discussion: A precise method of calculation of skin effect in isolated tubes [with author reply by H.B. Dwight]

In the above-named article by H.B. Dwight [ibid., Vol. XLII, 1923, August, p. 827] the formula derived and presented by was first derived by Oliver Heaviside and published by him in the "London Electrician" for August 6, 18R6 (p. 252). The article is reprinted in "Electrical Papers," Vol. 2, p. 67. Heaviside\´s formula for the case of a circular tube in which the current distribution is not affected by the return circuit is given in his equation (50b), p. 69, and again in a different form in (52b) in the "Electrical Papers." Dwight aknowledges the earlier work of Heavyside and comments on the use of Bessel functions in calculating the results.