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Updated: May 6, 2025
On one side of the laundry sink there is also one of Kedzie's large size rain-water filters, which holds several pails full of water, and which we commend as an admirable contrivance for the purposes intended.
This power of charcoal also extends to gases, and to certain noxious dissolved organic impurities, but it is never safe to rely too much on such filters, since the charcoal can at length become charged with impurities, and gradually cease to act. These filters need cleaning and renewing from time to time. Properties of Acids and Alkalis.
The water is thicker than pea soup, a green scum floats through the thickened mass, and the temperature is upward of 130 Fahrenheit. All kinds of insects are swarming in the putrid fluid, and a saltish bitter adds to its nauseating flavor. I have seen the exhausted coolies spread their dirty cloths on the surface, and form them into filters by sucking the water through them.
IMPERVIOUS ROCKS, such as granite, clay, and shale, have pores so minute that the water which they take in is held fast within them by capillary attraction, and none drains through. PERVIOUS ROCKS, on the other hand, such as many sandstones, have pore spaces so large that water filters through them more or less freely.
Perhaps the English peasant, the English operative, is less susceptible to such influences than the Scotch or the Irish; but over him, sordid as his conditions are, close kin as he is to the clod, the light of poetry is diffused; there filters into his life, also, something of that divine stream of which we have spoken, a dialect poem that touches him, the leaf of a psalm, some bit of imagination, some tale of pathos, set afloat by a poor writer so long ago that it has become the common stock of human tradition-maybe from Palestine, maybe from the Ganges, perhaps from Athens some expression of real emotion, some creation, we say, that makes for him a world, vague and dimly apprehended, that is not at all the actual world in which he sins and suffers.
As the fermentation in A would have continued a long time, being so very languid, and as that in B had been finished for several days, we brought to a close our two experiments on February 9th. To do this we poured off the liquids in A and B, collecting the yeasts on tared filters.
Expensive pests, these crabs; for they bore into the levees, and ruin them. The great sugar-house was a wilderness of tubs and tanks and vats and filters, pumps, pipes, and machinery. The process of making sugar is exceedingly interesting.
But you will be confined in a dark, subterranean dungeon where toads and snakes crawl, and but little of the light of day filters through the heavily mullioned windows. You will be loaded with chains.
"A subcrit display job, about four miles over the city." He laid the phone down and looked to the underside viewscreen. A little later, a silvery shape dropped away from the ship's south pole. The telescopic screen went off, and the unmagnified screen darkened as the filters went on. Valkanhayn, aboard the other ship, was shouting a warning about his own screens.
Analogous processes occur regularly in living cells. Again, when the chemist wishes to finish his filtration quickly, he uses filters which have a large surface. "In living protoplasms, this condition is very well fulfilled by the foam-like structure which affords an immense surface in a very small space." In the laboratory the chemist mixes his substances by stirring.
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