Theater of Machines, Volume II

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How one can weigh the water with convenient instruments and bring it properly to the place and end where one desires it.

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We want to give instruction first on how the water may be properly conducted from the springs to the cities and inhabited places. Such conduction, however, has its foundation in the leveling, which leveling happens primarily through the Dioptra an ancient surveying instrument, the water level, or the Corobates a long leveling instrument. Yet the Corobates is the most certain of all, for the reason that the water level and Dioptra sometimes fail and err, but the Corobates is a long straight-edge, 20 feet long, that has its Anconen elbows/supports or little arms set on both ends in equal measure, and well-joined and closed into one another, according to the