The annexed engraving is a perspective view of an improvement in operating machinery such as circular and upright saws, pumps —in short any machine driven by belts and pulleys. The inventor is Robert W. Parker, of Roxbury, Norfolk Co., Mass., who secured a patent for the same on the 17th March, 1852. The nature of the invention consists in driving machinery, such as circular and vertical saws, blowers, rotary pumps, &c, by a tending out and supporting the frame, F, of a small pulley, G. This frame is hung by the axis, E, passing through the outer ends of two arms, D D. The pulley has its axis in the frame; F, which is allowed slightly to rise and fall to pinch the belt, H, which passes over pulley G, (and the lower part over wheel C),and around the small pulley, I. which driv0 shaft or*pw4re, l,Miriidt may he a circular or scroll saw, or a blower or circular pump, &c. It will be observed by this arrangement of band and pulleys, that the driving pulley is really the wheel C. The arrangement by the swinging pulley, G, pinches the belt, H,on the periphery of said wheel, C, so as to press with any degree of force against it and the pulleys, G I. By this arrangement a great velocity can be communicated to the belt by hand power. No less than 2600 revolutions have been given in one minute to.a small city.