Note p. 383 n — INDEX.

[214] Born in Sweden, 1803; died, 1889. Became a mechanical engineer; came to America in 1839; invented the screw propeller, and in 1843 applied his self-acting gun-lock to a gun on the Princeton; invented the turreted ship, the Monitor, the principle of which soon displaced wooden ships from all the navies in existence; made a large number of other important inventions.

[215] In twenty years there was hardly a wooden ship of war afloat. The Monitor, however, did not prove to be a good sea-going vessel, and sank in December, 1862.