Among Burt's numerous inventions were the typographer in 1829, which was a predecessor to the typewriter.[3] He also invented the solar compass, a surveying tool used in the Michigan Survey, employed in regions that had an abundance of minerals, which would interfere with accurate readings when using ordinary instruments. While out surveying on September 19, 1844, in what is today Marquette County, Michigan, Burt discovered one of the largest iron ore deposits in the United States.[4] A historical plaque commemorates William Austin Burt at Stony Creek, near his home in Mt. Vernon, Michigan.