A wood mandrel with
a metal shaft to turn in the centers of a lathe was made to fit
the bored-out cylinder. The cylinder was then placed on the
mandrel, fastened with a pin, and threaded on both ends. Flanges
were next made from couplings discarded from an old horsepower
tumbling rod, to fit on the threaded ends of the cylinder casting.
When these flanges were tightly screwed on the casting and faced
off smooth the whole presented the appearance of a large spool.
The back cylinder head was made from a piece of cast iron, about
1/2 in. thick, turned to the same diameter as the flanges, and
with a small projection to fit snugly inside the cylinder bore.
Two holes were then drilled in this head and tapped for 3/4-in.
pipe. Two pieces of 3/4 -in. pipe were fitted to these holes so
that, when they were turned in, a small part of the end of each
pipe projected on the inside of the cylinder head. These pieces of
pipe serve as valve cages and are reamed out on the inside ends to
form a valve seat. The outlet for the exhaust and the inlet for
the gas and air are through holes drilled in the side of each pipe
respectively and tapped for 1/2-in.
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