A Dictionary of Chemistry and the Allied Branches of Other Sciences, Volume 3

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Longmans, Green, and Company, 1865 - Chemistry
 

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Page 132 - ABTU is the amount of heat required to raise the temperature of a pound of water one degree Fahrenheit.
Page 100 - On partially liquefying carbonic acid by pressure alone, and gradually raising at the same time the temperature to 88° Fahr., the surface of demarcation between the liquid and gas became fainter, lost its curvature, and at last disappeared. The space was then occupied by a homogeneous fluid, which exhibited, when the pressure was suddenly diminished or the temperature slightly lowered, a peculiar appearance of moving or flickering striae throughout its entire mass. At temperatures above 88° no...
Page 132 - It is hardly necessary to add, that anything which any insulated body, or system of bodies, can continue to furnish without limitation, cannot possibly be a material substance, and it appears to me to be extremely difficult, if not quite impossible, to form any distinct idea of anything capable of being excited, and communicated in the manner that heat was excited and communicated in these experiments, except it be MOTION.
Page 320 - To obtain ruthenium, scaly osmiridium is heated to bright redness in a porcelain tube, through which a current of air (freed from carbonic acid by passing through potash, and from organic matter by passing through oil of vitriol), is drawn by means of an aspirator. The osmium and ruthenium are thereby...
Page 133 - ... containing water, in the lid of which were two necks, one for the axis to revolve in without touching, the other for the insertion of a thermometer. A similar apparatus, but made of iron, and of smaller size, having six rotatory and eight sets of stationary vanes, was used for the experiments on the friction of mercury.
Page 103 - The first object was obtained by the successive action of two air-pumps; the first having a piston of one inch in diameter, by which the gas to be condensed was forced into the cylinder of the second pump, the diameter of whose piston was only half an inch. The tubes into which the air, thus further condensed, was made to pass, were of green bottle glass, from...
Page 138 - ... infinitely small in comparison with the interval between any two impacts. — 3. That the influence of the molecular forces be infinitely small. When these conditions are not completely fulfilled, the gas partakes more or less of the nature of a liquid, and exhibits certain deviations from Gav-Lussac and Boyle's laws.
Page 82 - The experiment is therefore quite similar to the determination of the specific heat of a substance by the method of mixtures ; the same apparatus may be used and the same precautions require to be taken in the two cases (see pp.
Page 122 - But, although this may be the case, experimental proof that it is so ia «till wanting ; and even if it were afforded here, or for any other particular substance, there would still not be sufficient warrant for assuming as a generally established fact that the cold of decomposition is equal to the heat of combination, independently of the conditions under which these processes respectively occur. In connection with these considerations, it is perhaps worth while to draw attention to the fact that...
Page 488 - Flintshire, £c. ; in the north, Derbyshire, Yorkshire and Cumberland, that is to say, the Brigantian territory ; and it is to this last district that the descriptions apply most correctly. Lead cast in Roman moulds, pigs, in fact, of the age of Hadrian and other emperors, have been found in Flintshire, Derbyshire, Yorkshire, and some other counties. But few ancient mining instruments have ever been found in the lead-bearing districts of...

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