As far as they were concerned in the 1940s you had to look like this to do technical drawing.
If you're like Hari, you might find it fun to recreate these in modern software. Hit the "L" link for the original size image, and pardon the poor quality of these quick captures.
Internet Archive has a borrowable version of a newer (but still pre-CAD) edition.
Entry first conceived on 9 March 2021, 16:23 UTC, last modified on 9 March 2021, 16:36 UTC
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