Photograph copyright © Marjorie Savill Linthwaite 2008Leonardo's notes infer that a prototype of this design may have been built for harnessing steam power for military use centuries before the Industrial Revolution. The barrel was made of copper and breech in which the ball was loaded and would be heated by red-hot coals. A small amount of water was injected into the chamber of the barrel creating a head of steam, forcing the cannon ball out of the barrel to a radius of two miles. This concept of defence strategy is quite amazing and frightening at the same time. copyright © Marjorie Savill Linthwaite 2008. All rights reserved.
Image: Steamgun.png - University of Technology Sydney 2008 
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