Crank Substitute Engine
Like the Coomber, this engine also came from Marlyn Hadley's wonderful book.6  I can do no better than to quote him:

 

This elaborate arrangement of gears and linkages enabled the builder to eliminate the crank as we know it.  While this engine required more labor to construct, it did make a compact engine which did not require a heavy crosshead as the connecting rod connection on the bar between the two gears moves but a very small amount.  This means the piston rod guides can be made of a lighter construction.

I do not know who invented it, when, or what prompted the inventor to think this arrangement is better than a crank...

-Marlyn Hadley

5/23/01 update:

A few visitors have noted that there was actually a patent on the crank mechanism in the very early days of steam technology.  This may have been the reason for the oddball design, but I still don't have a definitive source of information.  If anyone knows of a good book on the subject, please e-mail! 

Copyright 2000, Matt Keveney. All rights reserved.

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