I recently bought a 1935 and a 1959 General Radio equipment catalog. I
am absolutely fascinated by the old test equipment, and want to learn
how it is used, and what it is used for. I have found inexpensive
versions of an impedence bridge and signal tracer to practice on, but
need to start somewhere. Is there a recommended text that can help a
non-engineer get up to speed on these? Something like a technicians
text book that steps through the theory and practice from a pretty
basic level, without going deep into the theory by itself?

All replies appreciated. Thanks.

(Eventually I want to have a radio and electronics hobby workshop, and
get my license.)