. Chambers's encyclopedia; a dictionary of universal knowledge for the people. Perclose. percolation,throujrh the As materialand cames with it the soluble parts, hence per-colation is sometimes called the Alethod of Dis-placement. The forms of apparatus for percolationare very numerous, but the principle is the samein all—viz., a vessel with a porous bottom, and inthe form of a truncated cone inverted, receives thematerial first, and over it is poured the water orother fluid which is to extract its virtues. Onemade by an eminent French pharmacien, M. Bejot,is very effective and comi^letc. A is
. Chambers's encyclopedia; a dictionary of universal knowledge for the people. Perclose. percolation,throujrh the As materialand cames with it the soluble parts, hence per-colation is sometimes called the Alethod of Dis-placement. The forms of apparatus for percolationare very numerous, but the principle is the samein all—viz., a vessel with a porous bottom, and inthe form of a truncated cone inverted, receives thematerial first, and over it is poured the water orother fluid which is to extract its virtues. Onemade by an eminent French pharmacien, M. Bejot,is very effective and comi^letc. A is a long fuu-nel-shaped glass, with a glass stop-cock (&) in the. Percolator. bottom, which narrows to an inch in diameter; thisfits into the neck of a large globular vessel B, bothbeing adjusted by grinding. C is a syringe of brassfixed in the glass B as shewn, and made air-tightby a caoutchouc washer. a^, a*, a^ are threediaphragms of porous felt, pierced by the tube <?,which allows air bubbles to escape from the bottomwithout disturbing the fluid. The material to beacted upon, as wood, 1)ark, root, leaves, &c., is firstpowdered, and is then laid on the top of the upper-most diaphragm, a^, so as to half fill the spacebetween it and the t^lass-covcr c; water, or anyother required fluid, is then poured in until it isfilled, the stop-cock b is opened, and the opcratf)rdraws the air from the outer by mean -f the air-pump C, the fluid is thus rapidly drawn throughthe material, and displaces its 8olul)ie parts. a}and « arrest the fine solid particles which arecarried throui,h the first diaphra};m with theli(piid, and form sediments which
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