The object of my invention is to furnish a cheap and simple _means for imparting mechanical power_; and I accomplish this by means of a series of radial arms placed at right angles to and projecting from the axis of motion where power is first applied, and so arranged that each arm is in a different vertical plane, said arms being weighted at each end with a ball of metal. Some of these arms are also made hollow and inclose sliding or rolling weights, which move back and forth as the axis revolves, and the motion is still further re-enforced by a series of springs which are attached to the axis by a lever and eccentric. [Illustration] Taking the simplest form of my device, I illustrate the same by the accompanying drawings, in which-- Figure 1 is a side elevation of the entire apparatus. Fig. 2 is a sectional view showing the hollow arm with a rolling weight. Fig. 3 is an end view showing the operation of a re-enforcing spiral spring. Fig. 4 is a detailed view showing still further the method of re-enforcing motion by springs. Fig. 5 is a view of the driving-pulley with its hollow arms. Similar letters refer to similar parts in the several views. A is the axis to which the power first imparting motion is applied. N are the bearings supporting the same. B is the driving-pulley attached to said axis, and from which motion is imparted by means of the driving belt _b_ to any point desired. C are the hollow arms of the driving-pulley B. D are the solid arms radiating from the axis A. E are the hollow arms radiating from the axis A. F are the solid balls or weights secured to the ends of the arms D and E. _a_ are the sliding or rolling weights, which are inclosed within the hollow arms C and E. _c_ are the slots cut into the hollow arms E, to relieve the air-pressure formed by the backward and forward motion of the weights _a_. G are springs so arranged as to expend their force upon the axis A by means of the connecting rods H, both attached to the springs and one attached to the axis A by means of the eccentric I and the other to the wheel J at one end of the axis. K is a balanced lever, upon which the springs G may rest, said lever being supported at each end upon the springs L. M is a crank attached to one end of the axis A, and serves to show the place and manner in which the power may be applied.