Bob Schalck (ATS group) as a labour of love has scanned all (well most!) of the excellent Edmund Scientific books and technical brochures from the 60's, and 70's.
They contain a wealth of information, well written and perfectly illustrated.
Highly recommended.
Would like to be able to access and read some of the literature but all I get is a message on the Edmund site saying " We are experiencing technical difficulties " when trying to open the PDFs' . Is anyone else getting the same response .
I think you’ll find that if you use the first underlined ‘technical literature’ link, you’ll be able to access the listed individual topics via a table.