Keith Dysart wrote:
On Dec 11, 10:29 am, Cecil Moore wrote:
I've been reviewing my 1950s college textbooks to
see where my concepts came from. Here's a couple
of example quotes:

"Transmission Lines and Networks", Walter C. Johnson,
(c) 1950.

"... when the load reflects part of the incident energy,
it is found that the rms voltage and current vary almost
periodically along the line. This *effect* is *caused*
by the *interference* between the incident and reflected
waves, and the *resultant* variation is called a standing
wave."

. . .
Did Johnson really say "almost periodically"?
Pretty close to periodic, but not quite? Hmmmm!

I suppose it just shows that even the best write
with a bit of laxness now and then.

Short quotations without the context are so unfair.

...Keith

Yes, Johnson said that, but it's due to being precise rather than lax.
Much of the following sections deals with lines having loss, so his
statement is quite apparently intended to include them.

Roy Lewallen, W7EL