, by (1)
putting the disengaged steam in contact with the sides of a vessel that
contains a liquid colder than the one that produced it; (2) by raising
the temperature and pressure of the disengaged steam in order to
condense it in contact with the sides of the vessel which contains the
very liquid that has produced it.
The first of these means is realized in the apparatus called multiple
acting, that are at present so generally employed in sugar works. The
second means, which permits of a greater saving in fuel being made than
the other does, is realized by compressing the disengaged steam. This
compression, which raises the temperature and pressure of the steam,
permits of condensing the latter in contact with the vessel wherein it
has been produced. By such condensation we continuously restore to the
liquid which is being vaporized the heat of the steam which it gives
off.
This solution of the question, which has been partially seen at
different epochs, has but recently made its way into the industries.
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