Richard Fry wrote:
"Read Terman`s RADIO ENGINEERS` HANDBOOK, 1943 edition, pp 30-31 for
more on this (or many other sources)."

Amen. Terman doesn`t say different things in different places. He is
consistent. In Terman`s 1955 edition of "Electronic and Radio
Engineering" he writes on page 21:
"It is to be noted that some of this (magnetic) flux exists within the
conductor and therefore links with, i.e., encircles, current near the
center of the conductor while not linking current flowing near the
surface. The result is that inductance of the central part of the
conductor is greater than the part of the conductor nesr the surface;
this is because of the greater number of flux linkages existing in the
central region.

That`s why we have skin effect and why hollow pipes carry HF current as
effectively as solid rods with the same external surface area in most
cases. The pipe`s interior doesn`t carry current unless its diameter is
at least 1/2 wavelength (its cutoff as a waveguide).

Best regards, Richard Harrison, KB5WZI