The school of arts; or, an introduction to useful knowledge

الغلاف الأمامي
J. Murray and S. Highley, 1796 - 638 من الصفحات

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الصفحة 113 - ... 6. In fair weather, when the mercury falls much and low, and thus continues for two or three days before the rain comes, then expect a great deal of wet, and probably high winds.
الصفحة 115 - Va" pours are better kept fufpended, fo that they " have no Inclination to precipitate and fall " down in Drops, which is the Reafon of the " ferene good Weather which attends the " greater Heights of the Mercury. " 3. The Mercury finks the loweft of all by " the very rapid Motion of the Air in Storms
الصفحة 110 - Set a lighted candle upon the pump, and cover it with a tall receiver. If the receiver holds a gallon, the candle will burn a minute ; and, then, after having gradually decayed from the first...
الصفحة 144 - The condenfer confifts of one or more pumps furnifhed with clacks and buckets, (nearly the fame as in common pumps) which are wrought by chains faftened to the great working beam of the engine. The pipe, which comes from the cylinder, is joined ;to the bottom of thefe pumps, and the whole condenfer ftands immerfed in a ciftern of cold water fupplied by the engine.
الصفحة 57 - ... the jar to difcharge itfelf. If the coating is about two inches below the top, it will in general do very well; but there are fome kinds of glafs, efpecially tinged glafs, that, when coated and charged, have the property of difcharging themfelves more eafily than others, even when the coating is five or fix inches below the edge.
الصفحة 8 - When the prop is at one end of the lever, the power at the other, and the weight between them.
الصفحة 124 - Universally, therefore, a body plunged in water, loses as much of its weight as is equal to the weight of a body of water of its own bulk.
الصفحة 151 - ... natural position, with respect to other objects which we see and compare it with. If we lay hold of an upright stick in the dark, we can tell which is the upper or lower part of it, by moving our hand upward or downward; and know very well that we cannot feel the upper end by moving our hand downward.
الصفحة 141 - ... as high as the leather which covers the bellows will allow them, the water will remain in the pipe, and fupport all the weights, even though it fhould weigh no more than a quarter of a No.
الصفحة 115 - The greater height of the barometer is occafioncd by two contrary winds blowing towards the place of obfervation, whereby the air of other places is brought thither and accumulated ; fo that the incumbent cylinder of air being...

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