[Illustration: FILTERING PRESS FOR OLEAGINOUS SEEDS.--AUTOMATIC
INJECTION PUMP]
As regards their manufacture, these plates are cut out of sheets of
perfectly laminated brass, and are afterward set into a matrix to center
them properly. After the shells have been bored out, all the plates are
mounted therein so as to obtain a perfectly cylindrical and uniform
surface. The plates are then numbered and taken out; and, finally, a
slit with chamfered edges is cut longitudinally through them, save at
three points--two at the extremities and one at the middle. The plates
thereafter rest against each other only at these three points, and leave
at the chamfered places capillary openings just sufficient to give
passage to the oil, but not to the pressed paste, however fine it be.
As will be seen in Fig. 5, the points of contact are not in the same
horizontal plane, but are arranged spirally, so that the flow will not
be stopped at this place as it would be were these solid parts all at
the same height. The filter, F, is completed by two pieces that play an
important part. The first of these is a cast iron rim, J, which is set
into the upper edge, and forms a sort of lip whose internal diameter
corresponds exactly to the surface of the plates, b.
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