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Mar29-11, 07:02 AM
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?