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The reason is, that the rate of emission consequently the rate of absorption, which is its correlative increases very much faster than the temperature. In other words, a body radiates or cools at a continually accelerated pace as it becomes more and more intensely heated above its surroundings.
Glowing at first as a white-hot liquid, the lava soon cools at the surface to red and then to black; cinder-like scoriaceous masses form on its surface and in front of the slowly-advancing mass; clouds of steam and other vapor rise from it, and little cones are thrown up from its surface; but many years may elapse before the mass is cooled through.
Various explanations of this phenomenon have been proposed by MM. de Beaumont, Fournet, and Durocher. They refer to M. Gaudin's experiments on the fusion of quartz, which show that silex, as it cools, has the property of remaining in a viscous state, whereas alumina never does.
Cut a piece of paper large enough to allow it to overlap the top of the tumbler at least one-half inch on all sides; dip the paper in slightly-beaten white of egg; cover the glass as soon as the jelly cools and press down the paper until it adheres firmly. When the jelly has become cold, cover the top with melted paraffin to a thickness of one-third of an inch.
When you strike flint and steel together, the pressure of the blow not only makes bits of steel fly off, but makes them fly off in red-hot sparks. When you hammer a piece of iron with a hammer, you will soon find it get quite warm. When you squeeze the air together in your pop-gun, you actually make the air inside warmer, till the pellet flies out, and the air expands and cools again.
The palace is modeled after the choicest forms of Grecian architecture, and its wide colonnades surround a central court that is banked with rare flowers that fill the place with their fragrance, and in their midst springs a fountain that cools the summer air, and may possibly breed mosquitoes, but I do not think it does.
The staging gives him room to swing his heavy mass of glass as he blows it, and the pit in the floor, which is about ten feet deep, furnishes space for the big cylinder to run out, or grow longer, as he blows. The gathering for sheet glass is done much as was that for the smaller pieces. The gatherer collects a lump on his pipe, cools it a little, and collects more until he has enough.
We have got no boots to pinch our corns, and every time the surf rushes up it cools our feet, so we ought to be able to keep on till eight bells in the middle watch, by that time I should think we shall have gone something like forty miles from that river.”
I now say this much: there must be a rival in the background. When a man has been in love with one girl, and suddenly cools off, there is a reason for it, depend on it." "Even if there was a rival in the way, tell me what I could do, mamma, to to win him back!" "When a man once ceases to love you, you might as well attempt to move a mountain as to rekindle the old flame in his heart.
Thus, the land in warm regions is much heated by the sun's rays during the day; the atmosphere over it becomes also heated, in virtue of which it rises: the cool atmosphere over the sea rushes in to supply its place, and forms the sea breeze: which occurs only during the day. At night the converse of this takes place. Land heats and cools rapidly; water heats and cools slowly.
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