separated by a longitudinal partition. Above the stationary bottom, a,
there is arranged a lattice-work grating or a strong wire cloth, b,
upon which rests the filtering material, c, properly so called. The
reservoir is divided transversely by several partitions, d, of
different heights. The liquor entering through the leader, f,
traverses the apparatus slowly, as a consequence of the somewhat wide
section of the layer. But, in order that it may traverse the filtering
material, it is necessary that, in addition to this horizontal motion,
it shall have a downward one. As far as to the top of the partitions,
d, there form in front of the latter certain layers which do not
participate in the horizontal motion, but which can only move
downward, as a consequence of the permeability of the bottom. It
results from this that the heaviest solid particles deposit in the
first compartment, while the others run over the first partition, d,
and fall into one of the succeeding compartments, according to their
degree of fineness, while the clarified water makes its exit through
the spout, g. When the filtering layer, c, has become gradually
impermeable, the cock, i, of a jet apparatus, k, is opened, in order
to suck out the clarified water through the pipe, r.--_Dingler's
Polytech. Journ., after Bull. Musée de l'Industrie_.

[Illustration: SCHURICHTS FILTERING APPARATUS. Fig. 2.]

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LARGE BLUE PRINTS.