But what sort of an engineer has never heard of Timoshenko's Strength
of Materials? Several hundred editions were published in the last
hundred years. It is a reference known to every engineer and techie, to
every scaffolder and rigger.

Any mechanical or civil engineer would know that stuff, but electrical
engineers are not usually taught it except maybe a sophomore year 3
credit class. And usually quickly forgotten after the final exam. And
that was my experience 30 years ago, maybe most colleges have since
deleted this class as a requirement. Because there's too much more
pertinent stuff for electricals to learn.