vbl. sb. [f. FILTER v. + -ING1.]

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  1.  The action of the verb FILTER.

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1830.  M. Donovan, Dom. Econ., I. 191. The filtering of this rain through the ground carries with it the salt which it thence dissolves.

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1845.  J. Wilkinson, Patent, No. 10,984. The whole process of filtering is effected by pressure.

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  fig.  1876.  Geo. Eliot, Dan. Der., III. xlii. 235. Many of our people are on a footing with the best, and there’s been a good filtering of our blood into high families.

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  2.  attrib. and Comb., as filtering-apparatus, -bag, -box, -funnel, -material, -medium, -paper, -stand, -vessel; also filtering-basin (see quot. 1874); filtering-cup, a cup of porous wood used to illustrate the pressure of the atmosphere; filtering-press = filter-press; filtering-stone, any porous stone through which water is filtered; filtering-tank = filtering-basin (Knight).

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1845.  J. Wilkinson, Patent, No. 10,984. Which [a cistern] must be considerably above the level of the *filtering apparatus.

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1874.  Knight, Dict. Mech., I. 846/2. *Filtering Basin or Tank. (Hydraulic Engineering.) The chamber in which the water from the reservoir of water-works is received and filtered previous to entering the mains.

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1792.  G. Cowen, Patent, No. 1920. A quantity of sand, or any other *filtering material.

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1791.  J. Peacock, Patent, No. 1844. The ascent of the fluid through the *filtering medium.

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1757.  Lewis, in Phil. Trans., L. 163. The colourless sorts of *filtering-paper are preferable for this use to the coloured.

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1876.  Harley, Mat. Med., 311. This [Filtering Paper] is an almost pure form of cellulin.

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1874.  Knight, Dict. Mech., I. 846/2. *Filtering-press. One in which the passage of a liquid through a body of filtering material is expedited by pressure applied thereto. A pressure-filter.

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1827.  Faraday, Chem. Manip., i. 16–7. The *filtering stands are of this kind, and are thus raised to a convenient height for operations.

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1812.  J. Smyth, Pract. Customs (1821), 234. *Filtering Stones,—Duty—for every £100 value.

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1811.  J. Ashley, Patent, No. 3472. An improved *filtering vessel for purifying … water.

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