I claim for my engine cheapness, compactness, and uniformity of action, and economy in the use of steam, equal to the reciprocating engine.

This model was filed with the application to the U.S. Patent Office for Patent Number 51,389 issued to George A. Lamb of Washington, DC on December 5, 1865. Mr. Lamb’s patent was for a rotary steam ...

The accompanying illustration represents an ingenious rotary engine, which we have copied, and translated the description from Dingler's Polytechnic Journal published at Augsburg, Germany. The ...

Then in 1769 James Watt greatly improved it, making the engine four times as fuel-efficient. In 1781 he patented the rotary steam engine, which could turn a shaft and thus power machinery.

A New Rotary Steam Engine Scientific American , p. 356 (1 page) Published By: Scientific American, a division of Nature America, Inc.