Four-cycle internal-combustion engines having the supply and exhaust valves thereof located in separate valve-chambers
upon opposite sides of the working cylinder, the axes of such valves being parallel with the axial line of the working cylinder and lying in a plane passing therethrough and through the axis of the crank-shaft, and a reciprocating rod or rods extending longitudinally of the engine and operated by and in unison therewith for operating one or both of such valves in the proper order to secure the continuous automatic operation of the engine, and similar arrangements of valves and operating means therefor, but not shown in connection with all the elements necessary to form a complete and operative engine.
