> For example, I'm interested in the transition between trial-and-error seat of the pants engineering and mathematically based engineering.

It is difficult to know how best to document this kind of thing, the people who know about it probably don't want to write books or create their own websites.

My grandfather was responsible for part of the engineering side of the early British radar equipment, Wikipedia only really describes the scientific experiments that led up to it. I have plenty of stuff that I could add that he told me when teaching me electronics when I was a kid, but I would expect it to get deleted if I can't point at an external source.