Lectures on Chemistry: Including Its Applications in the Arts, and the Analysis of Organic and Inorganic Compounds

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Simpkin, Marshall, 1843 - 505 oldal
 

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22. oldal - It purifies it by distillation, when it raises it in vapours, and lets it fall in rain; and farther still by filtration, when, keeping it fluid, it suffers that rain to percolate the earth. We knew before that putrid animal substances were converted into sweet vegetables, when mixed with the earth, and applied as manure; and now, it seems, that the same...
20. oldal - But having afterwards procured a lens of twelve inches diameter and twenty inches focal distance, I proceeded with great alacrity to examine by the help of it what kind of air a great variety of substances, natural and factitious, would yield...
15. oldal - I do not here consider. What I call attraction may be performed by impulse, or by some other means unknown to me. I use that Word here to signify only in general any Force by which Bodies tend towards one another, whatsoever be the Cause.
21. oldal - I have been so happy as by accident to hit upon a method of restoring air which has been injured by the burning of candles and to have discovered at least one of the restoratives which Nature employs for this purpose. It is vegetation.
206. oldal - I -10th per cent., sufficient for the wants of the whole vegetation on the surface of the earth, — is it possible that the carbon of plants has its origin from the air alone ? This question is very easily answered. It is known, that a column of air of 2216.66 Ibs.
208. oldal - ... that whenever two volumes of air of different temperatures, are mixed together, each being previously saturated with vapour, a precipitation of a portion of vapour must ensue, in consequence of the mean temperature not being' able to support the mean quantity of vapour. This...
347. oldal - ... and at last I arrived at the conclusion that a metallic tissue, however thin and fine, of which the apertures filled more space than the cooling surface, so as to be permeable to air and light, offered a perfect barrier to explosion, from the force being divided between, and the heat communicated to an immense number of surfaces.
347. oldal - In exploding a mixture of 1 part of gas from the distillation of coal, and 8 parts of air in a tube of a quarter of an inch in diameter, and a foot long, more than a second was required before the flame reached from one end of the tube to the other ; and...
183. oldal - Are we not, then, authorized to conclude that water is composed of dephlogisticated air and phlogiston, deprived of part of their latent or elementary heat; that dephlogisticated or pure air is composed of water deprived of its phlogiston, and united to elementary...

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