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acetic acid action alkali alumina ammonia Annals of Philosophy antimony appears ARTICLE ascertained atom barytes beds bulb calcareous carbonic acid chalk chloride clay coal colour combined compound conductor contains copper crystals decomposed dissolved double salts effect electricity evaporated examination experiments fluate fluid fluoric acid formation glass globule grains gramme heat hydrogen hydrogen gas ignition inches Isle of Wight light limestone liquid magnesia mass matter mercury metal mineral mixture muriatic acid neutral nitrate nitric acid nitrous nitrous oxide º º observed obtained oxide of copper oxide of iron oxygen paratonnerre phosphorus plate pole portion potash precipitate produced proportion quantity red sandstone sand silica silver soda soluble solution specific gravity specimens strata substance sulphate sulphuric acid surface temperature thermometer tion tube vapour verdigris vessel volume water of crystallization weald weight wire zinc
464 페이지 - ... axis of the prism. It must then be placed upon a piece of well polished glass, and the glass heated to a considerable degree. At the proper temperature, which is about that of boiling water, the slice will adhere to the glass so firmly, that even when the...
395 페이지 - ... noisome effluvia ; during its continuance the fish float quite helpless on the turbid surface, and are easily taken. These rapid changes (as capricious in their nature as those of the Euripus), generally continue from thirty minutes to upwards of two hours ; and are succeeded by a breeze from the southward, which quickly increases to heavy gusts.
279 페이지 - ... appeared in chemistry. When we see energies so intense exerted by the ordinary forms of matter, we may...
97 페이지 - A piece of zinc as large as a pea, or the point of a small iron nail, were found fully adequate to preserve forty or fifty square inches of copper ; and this, wherever it was placed, whether at the top, bottom, or in the middle of the sheet of copper, and whether the copper was straight or bent, or made into coils. And where the connection between...
184 페이지 - A thick glass, though as much or more permeable to light than a thin glass of worse quality, allows a much smaller quantity of radiant heat to pass.
295 페이지 - In this instance the loss of sight was toward my left, and was the same whether I looked with the right eye or the left. This blindness was not so complete as to amount to absolute blackness, but was a shaded darkness without definite outline. The complaint was of short duration, and in about a quarter of an hour might be said to be wholly gone, having receded with a gradual motion from the centre of vision obliquely upwards towards the left.
426 페이지 - ... a moist soil. The wire indeed would pretty certainly be dispersed by the lightning, but it would direct it to the ground, and protect the surrounding objects from the stroke. However, it is always better to make the conductor so large as not to be destroyed by the stroke ; and the only motive for substituting a wire for a stout bar is the saving in point of expense. The noise of the thunder generally occasions much alarm, although the danger is then...
237 페이지 - The Century of Inventions of the Marquis of Worcester, from the original MSS. with Historical and Explanatory Notes, and a Biographical Memoir; by Charles F.
97 페이지 - ... form seven divisions, connected only by the smallest filaments that could be left, and a mass of zinc, of the fifth of an inch in diameter, was soldered to the upper division. The whole was plunged under sea water; the copper remained perfectly polished. The same experiment was made with iron ; and now, after a lapse of a month, in both instances, the copper is as bright as when it was first introduced, whilst similar pieces of copper, undefended, in the same...
296 페이지 - ... affection occurred again to myself, without my being able to assign any cause. whatever, or to connect it with any previous or subsequent indisposition. The blindness was first observed, as before, in looking at the face of a person I met, whose left eye was to my sight obliterated. My blindness was in this instance the reverse of the former, being to my right (instead of the left) of the spot to which my eyes were directed ; so that I have no reason to suppose it in any manner connected with...