This apparatus (see engraving) consists of a steam compressor, 0.835 m.
in diameter, actuated directly by a driving cylinder of 0.5 m. diameter
and 0.8 m. stroke, and of three evaporating boilers of the ordinary
vertical tube type, the first of which has a surface of 150 square
meters, the second 60, and the third 80.
The steam, at the ordinary pressure of the generators, say 5
atmospheres, is taken from the connected generators of the works, and is
led to the driving cylinder, where it expands and furnishes the power
necessary to run the compressor. It then escapes at a pressure of l.4
atmospheres and enters the intertubular space of the first evaporator.
The compressor sucks up the steam from the juice of the first evaporator
(which is boiling at the pressure of the atmosphere, without vacuum or
effective pressure), compresses it to 1.4 atmospheres, and forces it
likewise into the intertubular space. The ebullition of the first
evaporator, then, is kept up not only by the exhaust from the motive
cylinder, but also by the steam from the juice itself, which has been
rendered fit to serve as a heating steam by the pressure that it has
undergone in the compressing cylinder.
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