At their upper part the rods, f, pass through the side of
the boiler, through the intermedium of stuffing boxes, and are connected
by their upper extremities, through a link, with levers, g, that revolve
around the point, h. A cam shaft, M, communicates a temporary,
alternately rising and descending motion to the levers, g, and the rods
f. The same shaft, M, opens and closes the valve, z, of the hopper, D,
and thus regulates the entrance of the wash into the boiler. The frame,
E, receives its horizontal to and fro motion from the rod, l, which
traverses a stuffing-box and is moved by a crank on an eccentric, m. The
material in powder derived from the evaporation of the wash is stored at
the extremity of the apparatus into a lixiviating vessel, G, provided
with a stirrer, H. The salts and other analogous matters are dissolved,
and the residuum, which constitutes a carbonaceous mass, is forced out
of the apparatus, while the solution passes directly to the refinery,
where it is evaporated.
[Illustration: APPARATUS FOR THE EVAPORATION OF ORGANIC LIQUIDS.]
In manufactories where no refining is done, the crude potassa in powder
is pushed on to a prolongation of the apparatus which is cooled by means
of water, and is removed from time to time with shovels by the workmen,
so that the orifice of the boiler remains constantly covered externally
by the mass, and that the air cannot re-enter the apparatus.
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