The engine is fenced off by neat railing, and a platform with
access from one side is fitted round the top of the cylinder for getting
conveniently to the valve spindles and lubricators. The above engraving,
which is a side elevation of the cylinder, shows the valve gear
complete. There are two central disk plates worked by separate
eccentrics, which give separate motion to the steam and exhaust valves.
The eccentrics are mounted on a small cross shaft, which is driven by a
line shaft and gear wheels. The piston rod passes out at the back end of
the cylinder and is carried by a shoe slide and guide bar, as shown more
fully in the detailed sectional elevation through the cylinder, showing
also the covers and jackets in section. The cylinder, made in four
pieces, is built up on Mr. W. Inglis's patent arrangement, with separate
liner and steam jacket casing and separate end valve chambers. This
arrangement simplifies the castings and secures good and sound ones. The
liner has face joints, which are carefully scraped up to bed truly to
the end valve chambers. The crosshead slides are each 3 feet 3 inches
long and I foot 3 inches wide. The engine was started last year, and
has worked beautifully from the first, without heating of bearings or
trouble of any kind, and it gives most uniform and steady turning. It is
worked now at forty-one revolutions per minute, or only 820 feet piston
speed, but will be worked regularly at the intended 900 feet piston
speed per minute when the spinning machinery is adapted for the increase
which the four extra revolutions per minute of the engine will give; the
load driven is over 1,000 horsepower, the steam pressure being 50 lb.
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