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Updated: May 31, 2025
Davy and Faraday were well satisfied of the truth of Dalton's proposition, but they saw the futility of further efforts to put it into effect until new means of producing, on the one hand, greater pressures, and, on the other, more extreme degrees of cold, should be practically available. So the experiments of 1823 were abandoned.
Instead of using the fan in this experiment, we may use the "electric" radiometer with similar effect. But in this case it will be found that the vanes will rotate only at high exhaustion or at ordinary pressures; they will not rotate at moderate pressures, when the air is highly conducting. This curious observation was made conjointly by Professor Crookes and myself.
Each had felt two pressures on some part of his person; and had seen, though very indistinctly, some huge creature passing over him, apparently a quadruped, though what sort of quadruped none of them could tell.
Then the pressures, though sharp, were of short duration, and were not thoroughly transmitted through the body of the gun, so that the solidity, mass, and compression of the surrounding coils proved usually sufficient to support the interior lining. Now that breech-loading and slow powders have been introduced, these conditions have been changed.
It is not generally known that any burner used at ordinary pressures of gas gives a much better light when it is turned over with the flat of the flame horizontal, until the flame becomes saucer-shaped, as I show you. You can see for yourselves the increase in light; and in addition to this the workman has the great advantage of a shadowless flame.
He is not a bad man, nor is she a bad woman. To say that the story turns entirely on his honor and on her false pride is to miss, I think, the author's purpose. There is nothing distinctive in these characters; he is better than she, but both are puppets in the grip of brute circumstance rather than everyday characters shaped by the ordinary pressures of life.
This would be more than we would have a right to expect under circumstances the most favorable. Pressures on certain interests, it is admitted, have been felt; but allowing to these their greatest extent, they detract but little from the force of the remarks already made. In forming a just estimate of our present situation it is proper to look at the whole in the outline as well as in the detail.
Coming out, I found, was really more dangerous than going in, for it is while coming out of the "air" that men are liable to get the bends. Roughly, half a minute should be consumed in coming out from each pound of pressure, though for such high pressures as we had been under, considerably more time was required in order to do it safely. We spent about half an hour in the air-lock, I should judge.
CALCULATING PRESSURES FROM SPEED. The following table will give the pressures from 5 to 100 miles per hour: Velocity of wind in Pressure Velocity of wind in Pressure miles per hour per sq. ft. miles per hour per sq ft 5 .112 55 15.125 10 .500 60 18.000 15 1.125 65 21.125 20 2.000 70 22.500 25 3.125 75 28.125 30 4.600 80 32.000 35 6.126 86 36.126 40 8.000 90 40.500 45 10.125 95 45.125 50 12.5 100 50.000
This playful insistence, the light stress she laid upon her suggestion that Cecelia Brooke dance with him, considered in conjunction with her recent admonition, impressed Lanyard as significantly inconsistent. Sophie was no more a woman to make purposeless gestures than she was one sufficiently wanting in finesse to signal him by pressures of her foot.
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