These being the conditions, I say that the gnomon A B C will revolve from C to H and towards I, thence will return to C, thence to H as before, and so on perpetually. The cause of this continual motion is the forcible suspension; for the whole gnomon preponderates in C on account of the perpendicular tangent B A; which effect becomes more marked if a globe of iron S be supposed suspended at C. As therefore the whole of this mass, as well from the supports of the balance as from the momentary diameter, hangs suspended at C, and the vertex A, on account of the firm beam D E, cannot fall from the centre of the universe; it comes to pass that all points as well of the globe S, as of the gnomon A B C, with a continual motion turn round A; but because, by the line B A in the fixed point A, they are held from falling to the centre; therefore the greatest force of that tendency is exerted in the line B, and induces it to inclination; which inclination on account of the continuous solidity of the gnomon cannot be at all abated, so that the whole impetus is exerted either at the point A about the movable beam or at the movable poles of the beam D and E; which poles being free in their sockets D and E, abandon themselves to the motion of Nature, and thus do not in any wise hinder a perpetual circular motion. What indeed is self-evident in this, reason confirms, and daily experience in statics manifests. For if a short gnomon stand either on the terrestrial superficies M N, O P, or Q R; it will always fall towards the part C, or N, by the preponderating portion M K C; which is manifested in daily experiments. Thence it is evident that if the gnomon were entire, the force which it exerts at N would pass into the line B A still hanging over the centre. And this is one argument. The other is from the contrary. For if an equal and similar gnomon were attached towards the part D, then the whole mass hanging on its centre would remain in equilibrium and there would be no motion; consequently the one half being taken away, the other would necessarily move according to the laws and experience of statics. If the shortened gnomon M B C N were bound only to the point M, the rest being left free, it would certainly revolve, and in the same case, the point C would describe almost a semicircular arc till, coming down to a perpendicular position, it would there remain. Now as the force of the entire gnomon falls in the vertex A, there would be an entire and perpetual revolution around A. Much more would this be the case if on the centre C stood either the small curve A C L A or the larger one A K C, or finally the globe S alone, hanging from two iron rods A B and B C, or from one arc, A N C. From this, therefore, it may be demonstrated that a perpetual circular motion is possible.