Richard Harrison wrote:

Repetition of "along the helical conductor" implies to me, thal like
Terman, Kraus says the signal follows the actual wire, not sprinting
across the coil as if it were a straight rod.

It seems to me there is more than just one way to use a wire to convey
a signal. In fact it can be difficult to prevent a wire from using
more than just one, especially when there are other wires nearby.

73, Jim AC6XG