A framing square has a body 24 inches long, and tongue 16 inches long. A bench square has a body 12 inches long and a tongue 8 inches long for laying out on the bench its not so unwieldly as the framing square.
I think he is referring to a large Hook Rule made from a square, hook rules are used by machinists and woodworkers and it has a small hook on one end to hook over an edge for marking or measuring accurately from an edge. In old time books and technical manuals measuring is called mensurating.
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Irnsrgn
Knowledge must be shared or it lies dead in the mind.
The Blacksmith must use Hammer and Flame to force the iron down the path of his own choosing.
I usually find it much easier to be wrong once in while than to try to be perfect.
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