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GB Patent: GB-178,701,610
Steam engine
William Symington - Sanquhar, county Dumfries, Scotland

USPTO Classifications:

Tool Categories:
propulsion and energy : steam engines


Not known to have been produced


Patent Dates:
Granted: Jun. 05, 1787

Patent Pictures:
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Wikipedia biography of William Symington
Symington, only 23 years old at the time, saw a way to simplify Watt's steam engine by using a second piston that condensed the steam. When fresh steam entered the cylinder, the second piston was pushed down, evacuating the condensate. The first piston was pushed by atmospheric pressure when the other side of the piston experienced the vacuum created by the condensing steam. Symington went on to adapt his steam engine to power paddle boats, creating the first practical steam boats (see patent GB-180,102,544.

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