,
his crowning success, the duplex engine, which fairly deserves to be
placed first among the hydraulic inventions of this century. This engine
has since been more extensively duplicated for water works purposes than
any other, with the possible exception of the Cornish.
* * * * *
IMPROVED GUN PRESSURE GAUGE.
The following description of the construction and mode of action is by
Thomas Shaw, M.E., Philadelphia, the inventor.
[Illustration: IMPROVED GUN PRESSURE GAUGE.]
Fig. 1 represents the gauge secured to small ordnance, the gun shown in
cross section. Fig. 2 represents face view of the gauge and indicator,
exposing a vertical section through the hydraulic portion of the gauge,
on line 3 and 4 of Fig. 1. The same principles of reduction of high
pressure are used in this gauge as in Shaw's hydraulic gauge. It will be
observed that a solid steel piston, E, in the cylinder, A, is provided
with a plunger on its under side, which comes in contact with an elastic
packing, D; the plunger may stand as 1 to A 1,000, or as 1 to A 100, in
point of area of exposed surface, as compared with the large piston head,
as desired.
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