IV. Classified list of patents, &c.—Continued.

CLASS VI.-Steam and gas engines, including boilers and furnaces

therefor, and parts thereof.

IV. Classified list of patents, &c.-Continued.

CLASS VII.-Navigation and maritime implements, comprising all vessels for conveyance on water, their construction, rigging, and propulsion; diving dresses, life preservers, &c.

IV.-Classified list of patents, &c.—Continued.

CLASS VIII.-Mathematical, philosophical, and optical instruments, including clocks, chronometers, &c.

CLASS IX.-Civil engineering and architecture, comprising works on rail and common roads, bridges, canals, wharves, docks, rivers, weirs, dams, and other internal improvements, buildings, roofs, &c.

CLASS X.-Land conveyance, comprising carriages, cars, and other ve--` hicles used on roads, and parts thereof.

IV.—Classified list of patents, &c.—Continued.

CLASS XI.-Hydraulics and pneumatics, including water-wheels, windmills, and other implements operated on by air or water, or employed in raising and delivery of fluids.

CLASSIFIED LIST OF PATENTS THAT HAVE EXPIRED IN THE YEAR 1851..

CLASS I.-Agriculture, including instruments and operations.

CLASS II.-Metallurgy and manufacture of metals.