Hoc autem, sive plana est aqua seu sphaeroides, necesse est: <ad> extrema capita regulae sit pariter sustinere regulam aquam; sin autem proclinatum erit ex una parte, quae erit altior, non habuerit regulae canalis in summis labris aquam.
But whether the surface of the water is plane or spherical, it is necessary that the extreme ends of the plank should uphold the water evenly. But if there be a fall at one end, the end which is higher will not have water up to the lips of the channel.
final_alignments\Vitruvius_Architecture_Book_8.json