The plug of each cock has on its side a small hollow,
which during one part of its revolution presents itself under the
oil-pipe, and receives a charge of oil. During another part of its
revolution, which is timed to correspond with the flow of gaseous
mixture to the cylinder, the hollow of the plug presents itself to the
bend of a pipe leading from the top of the cylinder to a port opening
into the cylinder below the regenerator, in which port are situated
two wires of platinum. These wires are connected with the brushes of a
commutator, K, on the engine-shaft, which commutator is in electrical
connection with the poles of a battery, dynamo-electric machine, or
other source of electricity. Instead of two wires to produce a spark, a
single wire may be arranged to become incandescent at the proper time
for ignition.
The operation of the engine is as follows: Each piston as it ascends
draws into the annular space under it a supply of gas and air in
proportion regulated by the cocks or valves, and as it descends it
forces this charge into the interior of the revolving valve and its
casing, and into the reservoir which communicates therewith.
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