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Perpendicŭlum

κάθετος, μολυβδίς, στάθμη). A plumb-line, or string with a piece of lead attached, used by carpenters, masons, and other artisans to test the correctness of their perpendicular lines (Vitruv. vii. 3, 5). The line used in measuring horizontally was called linea (κανών).

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