ruler used by scribes for drawing right lines (Brunck, Anal.
3.69, 87); also the rule used by carpenters, masons, and other artificers,
for drawing straight lines on plane surfaces, whereas the perpendiculum or
was used for a vertical
]. (Aristoph. Ban.
798; Vitr. 7.3.5
; cf. Plat. Phileb.
56 B; Aeschin. c. Ctes.
§ 199; Plin. Nat. 36.188
.) That it was marked
with equal divisions, like our carpenters' rules, is manifest from the
representations of it among the “Instrumenta fabrorum
tignariorum,” in the woodcut at p. 243. The substance with which the
lines were made was raddle or red ochre (μίλτος,
1.221; φοίνικι κανόνι,
Eur. Her. 925
). The linea
(σχοῖνος, σπάρτον, μιλτεῖον,
6.103, 205; Poll. 10.186) was a line or cord for
the same purpose, either red or chalked (Cic.
ad Qu. Fr. 3.1
, 2; Vitr.
; Pallad. 3.9, 10). Regula is also the thread
of the screw [COCLEA
]: see Vitr. 10.11
; Blümner, Technologie,
4.124. For the regula of a wine or oil press, see TORCULAR