Wikipedia's history of this is very nice: http://en.wikipedia.org/wiki/History_of_the_steam_engine#Precursors http://en.wikipedia.org/wiki/History_of_the_steam

Wikipedia's history of this is very nice: http://en.wikipedia.org/wiki/History_of_the_steam_engine#Precursors http://en.wikipedia.org/wiki/History_of_the_steam_engine#Pre...