A centrifugal (Pat. 74,021) to separate liquids from paints depends on
building a wall of paint on the sides of the basket and carrying the
liquids off at the center.

A centrifugal (Pat. 310,469) for assorting wood pulp, paper pulp, etc.,
works by massing the constituents in two or three cylindrical strata,
and after action severing and removing these separately.

BREWING.--In brewing, centrifugals are quite useful. After the wort has
been boiled with hops, albuminous matters are precipitated by the
tannic acid, which must be extracted. Besides these the mixture
frequently contains husk, fiber, and gluten. The machine (Pat.
315,876), although quite unique in construction, has the same principle
of working as a sugar centrifugal, and need not be described. There is
one point, however, which might be noticed--that air is introduced at
about the same point as the material, and has an oxidizing and
refrigerating effect.

Class I. includes also centrifugals for the following purposes: The
removal of must from the grape after crushing, making butter,
extracting oils from solid fats, separating the liquid and solid parts
of sewerage, drying hides, skins, spent tan and the like, drying coils
of wire.

HORIZONTAL CENTRIFUGALS.--Only vertical machines have been and will be
dealt with. Horizontal centrifugals, that is, those whose spindles are
horizontal have been made, but the great inconvenience of charging and
discharging connected with them has occasioned their disuse; though in
other respects for liquids they are quite as good as vertical