A dictionary of chemistry and the allied branches of other sciences ...

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Longmans, 1871 - Science
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Page 127 - ABTU is the amount of heat required to raise the temperature of a pound of water one degree Fahrenheit.
Page 127 - 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 22 - The vessels and wires thus disposed make no change in the action of the instrument; the thermo-electric current being freely transmitted, as before, from the pile to the galvanometer. But if, by means of a wire F, a communication be established between the two vessels, part of the current will pass through this wire and return to the pile. The quantity of electricity circulating in the galvanometer will be thus diminished, and with it the deflection of the needle. Suppose, then, that by this artifice...
Page 95 - on partially liquefying carbonic acid by pressure alone, and gradually raising at the same time the temperature to 88° F., 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 1 "On the Continuity of the Gaseous and Liquid States of Matter :
Page 315 - 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 128 - The quantity of heat capable of increasing the temperature of a pound of water by one degree of Fahrenheit's scale is equal to, and may be converted into, a mechanical force capable of raising 838 Ib. to the perpendicular height of one foot.
Page 130 - The immediate cause of the phenomena of heat then is motion, and the laws of its communication are precisely the same, as the laws of the communication of motion.
Page 24 - These quantities of heat, expressed relatively to the quantity of heat required to raise the temperature of an equal weight of water from 0° to 1°...
Page 98 - 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 589 - ... It is further remarked in the report of the Commission that the wick-regulation in this lamp for the enlarging and reducing of the flame is an excellent one, and that Wolf's safety-lamp stands, in this particular also, at the head of all the lamps tested. The lighting-device works without fail, and has been brought to such a state of perfection that it is very seldom that one of the percussion-wafers is missing.

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