As the lines A C and K D, C B and K E, always continue of the same length in any position of the machine, the pieces A D and B E will always continue parallel to one another, and perpendicular to the horizon. However, the whole machine turns upon the points C and K, as appears by bringing the balance to any other position, as _a b e d_; and therefore, as the weights applied to any part of the pieces F G and H I can only bring down the pieces A D and B E perpendicularly, in the same manner as if they were applied to the hooks D and E, or to X and Y, the centers of gravity of A D and B E, the force of the weights (if their quantity of matter is equal) will be equal, because their velocities will be their perpendicular ascent or descent, which will always be as the equal lines 4 _l_ and 4 L, whatever part of the pieces F G and H I the weights are applied to. But if to the weight at V be added the little weight _u_, those two weights will overpower, because in this case the momentum is made up of the sum of V and _u_ multiplied by the common velocity 4 L. Hence follows, that it is not the distance C 6 multiplied into the weight V which makes its momentum, but its perpendicular velocity L 4 multiplied into its mass. Q. E. D. This is still further evident by taking out the pin at K; for then the weight P will overbalance the other weight at V, because then their perpendicular ascent and descent will not be equal. The Rev. Dr. Desagulier was evidently a man of scientific turn and capacity. It is unusual to find ministers deeply interested in scientific matters, and yet, he seems to have been. The net result of his experiments can be succinctly stated as follows: In the first problem there is _no change in the distance of the center of gravity from the support_, and, therefore, there could be no disturbance of the equilibrium. In the second problem there _is a change in the distance in the center of gravity from the support_, and there must have been a disturbance of the equilibrium. John Haywood's Device In 1790, John Haywood, of Long Acre, Middlesex, draftsman and mechanic, obtained British patent on: "A machine for working mills and engines without the aid of fire, water, or wind, or in aid of all or any of those or any other powers." The specification describes the device as follows: [Illustration] "The machine acts on a rotative principle, or, in other words, has a revolving circular or circulating motion round an axis, center, or centers. It may be made or constructed of any materials or matter whatsoever, so it be of sufficient strength to sustain the power of action when applied to any mill, engine, or machine to which action or motion can or may be communicated by a wheel. The size or dimensions of this machine are by no means confined, but may be varied or altered as circumstances may require.