), an instrument for determining the slope of an aqueduct
and the levels of the country through which it was to pass. From the
description given of it by Vitruvius, it appears to have differed but very
slightly from a common carpenter's level, which consists of a straight rule
supporting a perpendicular piece, against which hangs a plumb-line. The
chorobates had two perpendiculars and plumb-lines, one at each end, instead
of a single one in the middle. (Vitr. 8.5
; cf. Hesych. s.