350. The transmission of water through a series of pipes,
might be employed for the distribution of power, but the friction
would consume a considerable portion. Another method has been
employed in some instances, and is practised at the Mint. It
consists in exhausting the air from a large vessel by means of a
steam-engine. This vessel is connected by pipes, with a small
piston which drives each coining press; and, on opening a valve,
the pressure of the external air forces in the piston. This air
is then admitted to the general reservoir, and pumped out by the
engine. The condensation of air might be employed for the same
purpose; but there are some unexplained facts relating to elastic
fluids, which require further observations and experiment before
they can be used for the conveyance of power to any considerable
distance. It has been found, for instance, in attempting to blow
a furnace by means of a powerful water-wheel driving air through
a cast-iron pipe of above a mile in length, that scarcely any
sensible effect was produced at the opposite extremity. In one
instance, some accidental obstruction being suspected, a cat put
in at one end found its way out without injury at the other, thus
proving that the phenomenon did not depend on interruption within
the pipe.
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