The hand-book of household scienceA popular account of heat, light, air, aliment, and cleansing, in their scientific principles and domestic . ilters.—Through natures filter-beds water ascends, rising to the surface insprings, «fec. This is better, as their weighttends to oppose the ascent of the impuri-ties which are more likely to be left arrangement may be made availablein many ways; the principle is illustratedin Fig. 124. In the cistern or vessel thepartition a does not reach quite to the bot-tom. The middle division has a perforated bottom of metal or wood,above
The hand-book of household scienceA popular account of heat, light, air, aliment, and cleansing, in their scientific principles and domestic . ilters.—Through natures filter-beds water ascends, rising to the surface insprings, «fec. This is better, as their weighttends to oppose the ascent of the impuri-ties which are more likely to be left arrangement may be made availablein many ways; the principle is illustratedin Fig. 124. In the cistern or vessel thepartition a does not reach quite to the bot-tom. The middle division has a perforated bottom of metal or wood,above which is placed a layer of sand, and upon that a layer of char-coal. In the partition 5, and above the filter, is an aperture throughwhich the filtered water passes, and is drawn off by the faucet. Whererain water is to be preserved for household use (380), an undergroundcement tank should be constructed to store it, and a filter similar to theone described placed above, through which the water from the roofshould flow to the reservoir. Filters may be cleansed by reversing thedirection of the water through them. The principle of filtration is 424 PRINCIPAL CLEANSING AGENTS. 60 simple that any vessel can bo made to answer for it, tall ones beingpreferable to shallow. A box, cask, jar, or flower-pot may, with theleast ingenuity, bo made to serve the purpose. Besides sand, porousstone, pounded glass, woollen cloths doubled thickly, sponge, &c.,are used for filtering. But by far the most valuable agent for the pur-pose is charcoal. Its purifying action goes much further than mei-elystraining out mechanical impurities ; it acts powerfully to absorb anddestroy offensive gases (811). The foulest ditch water made to passthrough a layer of charcoal, comes out sweet, clear, and bright. Ani-mal charcoal, derived from burnt bones, is more powerful than woodcharcoal, owing, perhaps, to the fact that its mineral matter acts as adivisor, separating the particles and exposing a larger
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectfood, booksubjecthome
