At a recent meeting of the _Société Industrielle_ of Elbeuf, Mr. L.
Quidet described an apparatus that he had, with the aid of Mr. Perré,
invented for evaporating juices.

In this new apparatus a happy application is made of those pipes with
radiating disks that have for some time been advantageously employed
for heating purposes. In addition to this it is so constructed as to
give the best of results as regards evaporation, thanks to the lengthy
travel that the current of steam makes in it.

[Illustration: PERRE & QUIDET'S EVAPORATING APPARATUS.]

It may be seen from an examination of the annexed cuts, the apparatus
consists essentially of a cylindrical reservoir, in the interior of
which revolves a system formed of seven pipes, with radiating disks,
affixed to plate iron disks, EE. The reservoir is mounted upon a
cast-iron frame, and is provided at its lower part with a cock, B,
which permits of the liquid being drawn off when it has been
sufficiently concentrated. It is surmounted with a cover, which is
bolted to lateral flanges, so that the two parts as a whole constitute
a complete cylinder. This shape, however, is not essential, and the
inventors reserve the right of giving it the arrangement that may be
best adapted to the application that is to be made of it.

In the center of the apparatus there is a conduit whose diameter is
greater than that of the pipes provided with radiators, and which
serves to cross-brace the two ends, EE, which latter consist of iron
boxes cast in a piece with the hollow shaft of the rotary system.

The steam enters through the pipe, F, traverses the first evaporating