John Ericsson

John Ericsson (1803–1889) was a Swedish-American mechanical engineer of extraordinary versatility and inventiveness whose contributions ranged from the 1829 Rainhill Trials locomotive Novelty to the screw propeller that transformed naval architecture and the ironclad warship USS Monitor that proved decisive in the American Civil War. His railway work was brief and ultimately unsuccessful, but his contribution to naval and mechanical engineering was among the most significant of the nineteenth century.

Born at Värmland, Sweden on 31 July 1803, Ericsson trained at the Swedish Royal Military College and served as an officer in the Swedish army before coming to England in 1826 to seek opportunities in the rapidly expanding British engineering industry. He entered partnership with John Braithwaite in London and together they designed and built Novelty for the Rainhill Trials of October 1829 in just six weeks — a remarkable feat of rapid engineering that produced the lightest and most elegant locomotive at the trials, but one insufficiently developed for sustained operation.

After Rainhill, Ericsson continued in British engineering practice before moving to the United States in 1839 where his invention of the screw propeller — patented in 1836 and developed for practical naval use in America — transformed maritime propulsion and earned him both fortune and fame. The Monitor, the iron-hulled, turreted warship he designed for the Union Navy in 1861, fought the Confederate ironclad Virginia in the world's first battle between iron warships at Hampton Roads in March 1862, a decisive demonstration of the new naval technology. Ericsson died at New York on 8 March 1889, one of the most internationally celebrated engineers of the Victorian era despite his relatively modest contribution to railway engineering.