The compressed
air valves, which are seven in. in diameter, are brought back sharply
to their seats at each stroke, by a small piston operated by
compressed air flowing through a by-pass from the chamber. The
illustrations published by us on page 686 of our forty-seventh volume
show the construction of these compressors. The engravings on page 683
of the same volume illustrate the compressors used in a somewhat older
part of the installation; they were made by M. Blanchod, of Vevey, and
a passing reference may be made to them. The air is admitted through
valves in the cylinder, and is forced out through spring-loaded
valves; water is admitted into the cylinder to cool the air.
Fig. 7 indicates the modification made by Professor Riedler in one of
the Cockerill compressors: a receiver, A, was placed under the two
compressing cylinders, B and C. The first stage is completed in the
large cylinder, B, the air being compressed to about 30 lb. per square
inch; from this it is discharged into the receiver, A, through the
pipe, B?, where it meets with a spray injection that cools it to the
temperature of the water. The final stage is then effected in the
smaller cylinder, C, which, drawing the air from the receiver through
the pipe, C?, compresses it to about 90 lb. and delivers it through
the pipe, d, to the mains. We hope shortly to publish drawings of this
compressor in its final form; in its elementary stage Professor
Riedler claims to have obtained some very remarkable results.
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