A¹ and A² are air-tight chambers, the former being the driving chamber and the latter intended to check or counterbalance its wedging or binding effect upon the cylinder, owing to the extra leverage obtained and the pressure upon the surface of the rod B, the wheel will revolve in that direction by the action of the elastic force which finds its useful resistance on the internal surface of the cylinder C. D¹, D², D³, D⁴, are packings to render the two chambers air-tight and to afford bearings for the four arms of the wheel upon the cylinder; E, E, are two tubes for conducting the motor into the chambers, and F is the axle, upon which the wheel is firmly fixed and driven round with it. [Illustration] Fig. 2 is a side elevation of the power wheel. F is the hollow shaft or axle through which the motor passes from the pumps or reservoir in connection therewith, and upon which the wheel rotates; G is the rod or arm fixed at one end to the cylinder C, and attached at the other end by a joint or coupling H to the rod I, acting within a cylinder to give motion to the piston K; L is one of the side covers of the power wheel, and N the support or framework for the wheel. Richard Varley's Device In 1797 Richard Varley, of Damside, Lancashire, England, a merchant, applied for and obtained a British patent on "A New Perpetual Moving Power." His device is explained by the following excerpt from his application: "My invention consists of a method of applying the weight of the atmosphere upon a wheel in any other fluid, and by that means destroying its spring or reaction, the manner of doing which I describe as follows, agreeable to the drawing (Fig. 6) annexed: [Illustration]