Chemical technology: or, Chemistry in its applications to arts and manufactures (Google eBook)

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P. Blakiston, son & co., 1889 - Chemistry, Technical
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Page 382 - England it is customary to define a heat unit as the quantity of heat that is required to raise the temperature of a pound of water 1 on the Fahrenheit scale.
Page 673 - ... regenerator chequer-work is required to effect the gradual cooling of the products of combustion, and only a small portion near the top, perhaps a fourth of the whole mass, is heated uniformly to the full temperature of the flame ; the heat of the lower portion decreasing gradually downwards nearly to the bottom. Three or four times as much brickwork is thus required in the regenerators, as is equal in capacity for heat to the products of combustion. The best size and arrangement of the bricks...
Page 76 - ... present in very considerable quantities compared with the small proportion of firedamp, which in the opinion of those in and about the works just before, must have occasioned the explosion. But, on consideration of the character of the goaves and reservoirs for gaseous fuel, and the effect of dust in the mine, we are satisfied that these circumstances fully account for the apparent discrepancy.
Page 150 - ... baroscope, which is represented in Fig. 104. The BAROSCOPE consists of a beam like that of a balance, from one extremity of which is suspended a hollow sphere of copper, and from the other extremity a solid sphere of lead. These are made to balance each other in the atmosphere. If the instrument be placed under the receiver of an air-pump and the air exhausted, the copper sphere will descend. This shows that in the air it was buoyed up by a force greater than that exerted rig- 104.
Page 498 - L of energy of the heat communicated; and that a corresponding machine, or the same machine worked backwards, may be employed to produce cooling effects requiring about the same expenditure of energy in working it to cool the same substance through a similar range of temperature. When a body is heated by such means about...
Page 373 - ... engine than in a small one, because the distance through which the flame has to travel is greater. During the investigation already referred to, Professor Bunsen determined the celerity of the propagation of ignition through a pure explosive mixture of hydrogen and oxygen in the following manner : the explosive mixture was allowed to burn from a fine orifice of known diameter, and the current of the rate of the gaseous mixture was carefully regulated by diminishing the pressure, to the point...
Page 75 - In considering the extent of the fire from the moment of the explosion it is not to be supposed that fire-damp was its only fuel ; the coal dust swept by the rush of wind and flame from the floor, roof, and walls of the works would instantly take fire and burn, if there were oxygen enough present in the air to support its combustion ; and we found the dust adhering to the faces of the pillars, props, and walls in the direction of...
Page 374 - ... of a second. It does not matter whether the mixture used is rich or weak in gas ; the rich mixture can be fired slowly and the weak one rapidly, just as may be required. The rate of ignition of the strongest possible mixture is so slow that the time of attaining complete inflammation depends on the amount of mechanical disturbance permitted.
Page 77 - ... are successively decomposed, yielding explosive mixtures with the air, whereby the fire is carried along ; the intensity or violence of the burning being much influenced by the physical characters (fineness, etc.
Page 387 - Therefore the best chimney draught takes place when the absolute temperature of the gas in the chimney is to that of the external air as 25 to 12.

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