Nikola Tesla U.S. Patent 514,169 - Reciprocating Engine Patent Wrapper Page 20

JJ (JUJ JJ CJUILLILJ autstitute. In. 13.93 Gram Mosman san Copeland Allison Having now described my invention, what I clsim is; 1. A reciprocat ing engine comprising a cylinder and piston, and a spring connected with or act ing upon the reciprocating element combined and related in substantially the manner described so that the forces which tend to bring the reciprocat ing parts into a given position are proportionate to the displacements whereby an isochronous vibration is obtained. 2. A reciprocating engine comprising a cylinder and a pist an impelled by steam or gas under pressure and an air-spring maintained in vibration by the movements of the piston, combined and related in substantially the mann er described so that the forces which tend to bring the reciprocating parts into a given position are proportionate to the displacements whereby an isochronous vibration is obtained. 3. The combination of a cylinder and a piston. adapted to be reciprocated by steam or gas under pressure, a cylinder and a plunger therein reciprocated by the piston and constituting with its cylinder an air spring adapted to maintain the piston in reciprocation at a deA Oct. 30fine rate or period as set forth The combination of a cylinder and a piston adapted to be reciprocated by steam or gas under pressure, a cylinder and piston const it ut ing an air spring connected 4. -1065