Watt's rotary steam engine 38 HP, 1808

Historic Steam Engines Series: 1808 - Mr. Watt's Rotative Steam Engine, as constructed by Messrs. Boulton and Watt, Soho, 1808, 38 Horse power
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"This is the construction which Mr. Murdock adopted for large house-built
steam-engines for manufactories, during the first ten years that he directed the
manufactory at Soho, after Mr. Watt retired from the business. The action of
the steam in this engine is precisely the same as in Mr. Watt*s original rotative engine
(see p. 459) ; the chief differences in the construction are in the nossels, and
in the working gear for opening the valves. The steam-valves are made with
tubular spindles, to admit the spindles of the exhausting-valves through them, on
the plan already described, p. 684 ; and the valves are opened and shut by the
motion derived from an excentric circle fixed upon the axis of the crank. The
foundations are entirely of stone without any timber ; and all the other parts,
except the spring beams, are of metal. The great lever is made of cast iron, and
its centre of motion is supported by a cast iron column. The rotative motion is
obtained by a simple crank, in lieu of sun and planet-wheels, and a multiplyingwheel
is fixed on the axis of the crank, to turn a pinion on the axis of the flywheel,
and thus give it an increased velocity." Farey: "treatise on the Steam Engine", London 1827

Based on:
https://archive.org/details/treatiseo...
https://books.google.be/books/about/T...

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