'Archimedes' screw propellor, 1839.

Block model after body of the original experimental vessel 'Archimedes' made in 1839 by H Wimshurst of Limehouse for the Ship Propellor Company. This screw propellor represents the one patented by Francis Pettit Smith (1808-1874) in 1836. In 1839 Smith built the first successful screw-propelled steamer, the Archimedes, before going on to built the first screw warship, the 'Rattler', for the Royal Navy. In 1860, Smith was appointed a curator of the Patent Office Museum, London.