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Mar29-11, 06:02 AM
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Quote Quote by Studiot View Post
However the fact remains that up to the late 1960s boys in their first year in an English grammar school would be taught the construction, from Euclid, that I was referring to.

In those days such a construction was used by engineers and draughtsmen and a version appeared on many boxwood scales of that time.
I seem to have lost my boxwood scales and skipped 1960s grammars, so you might actually have to state what it is you are referring to here. Does it have a name? Can you provide a link? Or would that be too shockingly precise?