FE Kenney with His Auto Motor Operated by Compressed Air

(Original Caption) A working model of an air-driven hydraulic motor, involving a new principle in automobile reconstruction, had been perfected by F.E. Kenney, Portland, Oregon, mechanical engineer. The machine is operated in much the same way as a locomotive or steam engine, except that air pressure instead of steam pressure is utilized as motive force. Power is derived from a small electric motor run by current from a storage battery. The motor operates an air pump which keeps up pressure in the tank. The compressed air, mixed with oil, is admitted to two hydraulic cylinders, where it drives the pistons.