| I first learned of this delightful engine while attending
the PRIME show in Oregon. A most prolific modeler, Marlyn Hadley,
had one on display. I referred to his excellent book6
to create this illustration.
I have not illustrated the valve linkage, as I'm not exactly sure
what it looks like! It appears to be a rotary type, incorporated
into the main drive shaft. Steam would be admitted to one end of
the cylinder at a time, just as in any other double-acting steam engine.
The inner dimension of the stationary ring is not circular, but is
slightly elliptical. The main bearing is offset from the center of
this ellipse by a one half the stroke length.
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