The second species of centres is, in each of these bodies, unique and single, and it resides — without occupying any place — at the middle of the natural gravity of these bodies. This centre is so situated within its body that whoever should divide the body by a straight cut passing over it, the divided parts would always remain of equal weight.

The second species of centres is, in each of these bodies, unique and single, whence the middle of the natural gravity of them resides without occupying place. Of the second species of centres in each of the...

Of the 2nd species of centres we find but a single one dwelling at the middle of the natural heaviness of each body. Of the second species of centres we find a single one dwelling in each of the bodies. This, without occupying place, resides at the middle of the natural gravity of these bodies.

Of the second species of centres there is found only one per body, which resides at the middle of the natural gravity of these bodies without occupying place.

Of the second species of centres we find no more than a single one per body.

This is that true centre which resides at the middle of the natural heaviness of these bodies without occupying place. This truly seems to be the soul of weights, because always, in the part where it dwells, it makes itself the guide of their motions and joins itself with the centre of the path it makes through the air.

This is that which, were one to lift the earth from its site and let its body run free through the air, would make itself the centre of the universe.

A way of weighing water, namely to make the bottom of a vessel movable and fastened with leather to the lips of the bottom of that vessel, in the manner of a lantern of waxed cloth. And upon the bottom of that lantern let all the water of the vessel rest, and let that bottom have fixed at its middle the

cord of the balance.

weight, a n m, water

The weight that presses upon the cistern will drive up through the exhalation pipe as much water as will weigh the same as that part of the weight which presses over the entry of that pipe into the cistern, the pipe being uniform in its bore. That is, if the mouth of the pipe fits a thousand times into the walls of the cistern, the weight it presses will employ the thousandth part above the entry of that pipe — though, however, it exerts, I believe, more force downward than crosswise.