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κανών, γωνία). A square for measuring right angles; employed by carpenters, masons,

Normae. (Rich.)

builders, etc., to prove that the angles are true (Vitruv. vii. 3; Pliny, xxxvi. 51). It was formed in two ways, either by two rules (regulae) joined together at right angles, or by a flat piece of board with a right angle cut out of it; both of which are exhibited in the illustration, from sepulchral marbles. See Amussis; Rubrica.

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