FILTER n.
sed to cleanse it from the solid or impure matter held in suspension; a chamber or device containing such substance; a strainer; also, a similar device for purifying air. Filter bed, a pond, the bottom of which is a filter composed of sand gravel. -- Filter gallery, an underground gallery or tunnel, alongside of a str…
FIXED a.
inclosed together in a case ready for loading. -- Fixed battery (Mil.), a battery which contains heavy guns and mortars intended to remain stationary; -- distinguished from movable battery. -- Fixed bodies, those which can not be volatilized or separated by a common menstruum, without great difficulty, as gold, plat…
FLOTATION PROCESS n.
A process of separating the substances contained in pulverized ore or the like by depositing the mixture on the surface of a flowing liquid, the substances that are quickly wet readily overcoming the surface tension of the liquid and sinking, the others flowing off in a film or slime on the surface, though, perhaps, h…
FLOUR n.
auze-covered, revolving, cylindrical frame or reel, for sifting the flour from the refuse contained in the meal yielded by the stones. -- Flour box a tin box for scattering flour; a dredging box. -- Flour dredge or dredger, a flour box. -- Flour dresser, a mashine for sorting and distributing flour according to grad…
FOLIO n.
A leaf containing a certain number of words, hence, a certain number of words in a writing, as in England, in law proceedings 72, and in chancery, 90; in New York, 100 words. Folio post, a flat writing paper, usually 17 by 24 inches.