A MOTOR OPERATED BY THE EXPANSION AND CONTRACTION OF METAL. In the motor shown in the accompanying illustra tion two bands are alternately expanded by the direct application of beat and the bands are so connected with springs that when one band is expanded it re leases its hold on the springs while the other band is receiving the full pressure of the springs. 'Pyromo' is the name given this motor by its inventor Dr. W. W. French of Fort Branch Ind. The engraving represents a sectional side elevation of the motor a loosely rotating wheel having an exterior expanding and contracting rim preferably made by sets of metallic bands arranged one alongside the other. The bands are subjected to the heat from gas burners which open into a hood on one side of the wheel and the ends of each band pass over pulleys journaled in suitable bear ings in the sides or spiders of the wheel the two sets of bands passing over corresponding sets of alternately arranged pulleys. The ends of the bands after pass ing over the pulleys connect with links in the middle of the outer leaves of elliptical springs the springs being attached at the middle of their inner leaves to bands are supported intermediate of their pulleys on posts and the bands are connected at their middle by inwardly extending links with levers fulcrumed in the sides of the wheel. Each link has a turn buckle whereby the length of the link may be increased or di minished and the levers are connected by other links with a disk on a crank arm on the shaft. The bands of each set connect at their ends with the same springs and they connect by independent links with separate levers opposite each other and connected with opposite sides of the disk on the shaft. As a band is heated from the burners its ex pansion releases a set of springs whose closing power is exerted on the ends of another band and through the two links and lever a pull is exerted on the disk to cause the wheel to rotate in the direction of the arrow. A similar op
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