Theater of Machines, Volume II

angle-hook, together with the cross-beams between such straight-edge and the supports, which have their lines directed according to the plumb line, with the attached weight hanging in all places according to the plumb line.

Whose small weight-lines, or little cords—as the straight-edge is adjusted—give an indication by touching the marked lines of the plumb line straight, that such is in the correct leveling and balance. But where the wind might bring a hindrance in this and, through the movement, such balance might not show a certain indication, a channel should be made on top of it, 5 feet long and one cross-finger high; into this, one pours water so that it touches the port of the channel on all sides; then one is certain of the leveling. Thus, it is learned through such Corobates how high such springs lie. But someone at this point who has read the books of Archimedes might object to us that such leveling of the water could not happen through the water, since he wills that such water does not hold itself according to weight, but in another form, lays itself out, and has its focal point in the center of the sphere, where the center of the whole world is placed.

But