screw propellors

1. The Screw Powered Warship 1.1 Topic Introduction The development of the screw powered warship began in 1839 when a Swedish-American inventor, John Ericsson revolutionized maritime engineering1 with the invention of the screw propeller. However, Ericsson¡¦s invention didn¡¦t develop until early 1860¡¦s, when Abraham Lincoln ordered the US Navy to build an ironclad. 2 The US Navy were not on good terms with Ericsson and doubted his design of the USS Monitor, so why was Ericsson awarded …

…prnctn.htm 6 John H. Lienhard ¡¥The Engines of Our Ingenuity¡¦ 1997, No. 695: John Ericsson. 7 Richard Hough ¡¥A history of Fighting Ships¡¦, Octopus Books limited, 1975 p. 105-108 8 Jeff Johnston, ¡¥Building the USS Monitor¡¦, ¡¥Monitor¡¦ Nation Marine Sanctuary, National Oceanic and Atmospheric Administration 9 Trevor Nevitt Dupuy, ¡¥The Military History of Civil War Naval Actions¡¦, Franklin Watts, Inc. 1961, p. 39 ¡V 50 10 Inventure Place, ¡¥John Ericsson: Propelling Steam Vessels¡¦, NetForce Development, Inc., Internet Website, http://www.invent.org/book/book-text/40.html