pipe, then the second, then the third, and so on, and continues to
circulate in this manner till it finally reaches the last one, which
communicates with the exit, G.

Motion is transmitted to the evaporator by a gearing, H, which is
keyed on the shaft, and is actuated by a pinion, L, connected with an
intermediate shaft which is provided with fast and loose pulleys.

The apparatus is very efficient in its action, and this is due, in the
first place, to the use of radiators, which greatly increase the
heating surface, and second, to the motion communicated to the
evaporating parts. In fact, each of the pipes, on issuing from the
liquid to be concentrated, carries upon its entire surface a pellicle
which evaporates immediately.

The arrangement devised by Messrs. Perré and Quidet realizes, then,
the best theoretic conditions for this sort of work, to wit:

1. A large evaporating surface.
2. A very slight thickness of liquid.
3. A constant temperature of about from 100° to 120°, according
to the internal pressure of the steam.

Owing to such advantages, this apparatus will find an application in
numerous industries, and will render them many services.--_Revue
Industrielle._

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