Re: Apprentice's electrical notes
I've always been vaguely fascinated by this sort of thing, along with the "Trade test pieces" journeyman electricians/workshop-mechanics/potters/plumbers/carpenters/joiners/engravers were required to produce in orcer to be admitted to the appropriate 'guild'.
Intriguing as a period-piece and a historical snapshot - but when a couple of decades back I tried to interest various museums/historical-artifacts-societies with my late father's WWII-era document-archive [which included a bunch of stuff from his time attached to Pye in Cambridge - they were not allowed to mention Magnetrons and had to refer to them as 'the thing'] nobody was interested, so "in the interests of national security" I had the lot shredded.
Crochet/embroidered 'samplers' can at least be framed and displayed as ornaments; this can't really be said of charts showing B-H magnetisation-curves for DC-energized field-coils.
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