Old books/magazines and the gems within
One of the things I like about browsing through old books and magazines (talking 1920' - 30's here) are the amazing gems of information that can be found.
The attached pic is but one example from the Amateur Wireless Handbook "Simple Valve Receiving Sets" from 1923 about making the 'grid condenser and leak'.
There is even a description of making the valve holder from scratch in the same book (on American Radio History site).
Anything anyone else has come across that they find interesting/fascinating/useful in light of how things are done these days?
And yes, I do realise doing such things was the norm in those days, but I find it a fascinating glimpse of 'how life used to be'.
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