Annals of Philosophy, Band 9;Band 25Baldwin, Cradock, and Joy, 1825 |
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Häufige Begriffe und Wortgruppen
affinity alkali alumina ammonia animal Annals of Philosophy antimony appear ARTICLE atoms of oxygen barytes beds Berthollet Berzelius blowpipe bodies boiling carbonate cerium chalk chemical chemist Chemn chlorine colour combination compound containing copper crystals cyanuret decomposed decomposition deposits diluvial discovery dissolved earth Edelcrantz effect evaporated examination experiments ferruginous sand flame Folkstone formation formed fossil glass green sand heat hydrogen Ibid ignited improvements inches Isle of Wight lead light lime liquid magnesia marl matter means memoir mercury metallic mineral muriatic acid nature nitrate nitric acid observations oxide oxide of uranium oxidule oxygen paper phenomena portion potash precipitate prisms produced proportion quantity remains remarkable salt shells silica Silicated fluate silver Society soda soluble solution species specimens strata substance sulphate sulphuret sulphuric acid surface temperature Testa thermometer tion tube uranium vale of Pewsey weald clay weight yellow zinc
Beliebte Passagen
Seite 283 - It is literally true that in this single cavern (the size and proportions of which are nearly equal to the interior of a large church) there are hundreds of cart-loads of black animal dust entirely covering the whole floor, to a depth which must average at least six feet, and which, if we multiply this depth by the length and breadth of the cavern, will be found to exceed 5,000 cubic feet.
Seite 455 - ... 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.
Seite 298 - ... equilibrio with that of the menstruum, no such effect of deposition of alkaline matter or adherence of weeds has taken place, and the surface, though it has undergone a slight degree of solution, has remained perfectly clean : a circumstance of great importance, as it points out the limits of protection; and makes the application of a very small quantity of the oxidable metal more advantageous in fact than that of a larger one.
Seite 297 - The tendency of electrical and chemical action being always to produce an equilibrium in the electrical powers, the agency of all combinations formed of metals and fluids is to occasion .decompositions, in such an order that alkaline, metallic, and inflammable matters are determined to the negative part of the combination, and chlorine, iodine, Oxygene and acid matters to the positive part. I have shown in the Bakerian Lecture for 1806, that this holds good in the Voltaic battery. The same law applies...
Seite 456 - ... circumstances remaining the same, to the rapidity of combination, and to the density of the gases combining. Thus, the heat of flames diminishes by rarefaction, and increases by condensation. Whenever combustible gaseous matter burns in the atmosphere, it must first mix with a certain 'quantity of air : if it require a high temperature for its combustion, it will be easily extinguished by rarefaction, or by cooling agencies, whether of solid surfaces, or mixtures of incombustible gases : if it...
Seite 296 - ... the unprotected copper underwent rapid corrosion, becoming first red, then green, and losing a part of its substance in scales. Fortunately, in the course of these experiments, it has been proved that cast iron, the substance which is cheapest and most easily procured, is likewise most fitted for the protection of the copper. It lasts longer than malleable iron, or zinc; and the plumbaginous substance, which is left by the action of sea water • upon it, retains the original form of the iron,...
Seite 296 - Fortunately, in the course of these experiments, it has been proved that cast iron, the substance which is cheapest and most easily procured, is likewise most fitted for the protection of the copper. It lasts longer than malleable iron, or zinc ; and the plumbaginous substance, which is left by the action of sea water upon it, retains the original form of the iron, and does not impede the electrical action of the remaining metal. I had anticipated the deposition of alkaline substances in certain...
Seite 308 - ... coincide with that of the Sun and Moon. This instrument has four eye-glasses, the least of which, magnifies 175 times, and the largest 700 times.
Seite 458 - Supposing oxygen and hydrogen to be in the relations of negative and positive, it is necessary to effect their combination, that their electricities should be brought into equilibrium or discharged. This is done by the electrical spark or flame, which offers a conducting medium for this purpose, or by raising them to a temperature, in which they become themselves conductors. Now platinum, palladium, and iridium are bodies very slightly positive with respect to oxygen...
Seite 227 - CARRIAGE. unquestionably, exists in the solution, in passing to the state of deutosulphate, deposits its base, which gives up its oxygen and acid, to form the new salt. It is evident that the revival of the copper may be effected, in this manner, without the assistance of any iron; and, in fact, there are no traces of that metal in the interior of the tub. It is not, however, this part of the phenomenon that appears to me most remarkable, but the cohesion, acquired by the copper, so precipitated,...