Philosophical Transactions of the Royal Society of London

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W. Bowyer and J. Nichols for Lockyer Davis, printer to the Royal Society, 1817

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Էջ 76 - L2 which threw down showers of stones, was estimated at seventeen miles high. The velocity of motion of these bodies must in all cases be immensely great, and the heat produced by the compression of the most rarefied air from the velocity of motion must be probably sufficient to ignite the mass...
Էջ 37 - It will be proper then to rince the corn with cold water, in order to remove any portion of the water which had taken up the must ; after which, the corn being completely drained, is, without loss of time, to be thinly spread on the floor of a kiln, and thoroughly dried, care being taken to stir and to turn it frequently during this part of the process.
Էջ 76 - ... falling stars be supposed to be small solid bodies moving round the earth in very eccentric orbits, which become ignited only when they pass with immense velocity through the upper regions of the atmosphere, and if the meteoric bodies which throw down stones with explosions be supposed to be similar bodies which contain either combustible or elastic matter.
Էջ 80 - Platinum and palladium have low conducting powers, and small capacities for heat compared with other metals, and these seem to be the principal causes of their producing, continuing, and rendering sensible these slow combustions. I. have tried some earthy substances which are bad conductors of heat ; but their capacities and power of radiating heat appear to interfere. A thin film of carbonaceous matter entirely destroys the igniting power of platinum, and a slight, coating of sulphuret deprives...
Էջ 322 - Of all the celestial objects consisting of stars not visible to the eye, the milky way is the most striking; its general appearance, without applying a telescope to it, is that of a zone surrounding our situation in the solar system, in the shape of a succession of differently condensed patches of brightness, intermixed with others of a fainter tinge.
Էջ 49 - ... rarefied fifteen times, and at this pressure the flame heated a wire of platinum to dull redness, nor was it extinguished till the pressure was reduced to —.* Phosphorus, as has been shown by M.
Էջ 75 - The form of the flame is conical, because the greatest heat -is in the centre of the explosive mixture. In looking steadfastly at flame, the part where the combustible matter is volatilized is seen, and it appears dark, contrasted with the part in which it begins to burn, that is, where it is so mixed with air as to become explosive.
Էջ 79 - ... become glowing, almost white hot, and will continue so as long as a sufficient quantity of vapour and of air remain in the glass. When the experiment on the slow combustion of ether is made in the dark, a pale phosphorescent light is perceived above the wire, which of course is most distinct when the wire ceases to be ignited.
Էջ 82 - By increasing the quantity of the coal gas still further, the ignition of the platinum became less vivid : when its light was barely sensible, small quantities of air were admitted ; its heat speedily increased ; and by regulating the admission of coal gas and air, it again became whitehot, and soon after lighted the flame in the cylinder, which, as usual, by the addition of more atmospherical air, rekindled the flame of the wick.
Էջ 78 - I threw in more coal gas, expecting that the heat acquired by the mixed gas in passing through the wire-gauze would prevent the excess from extinguishing the flame. The flame continued for two or three seconds after the coal gas was introduced ; and when it was extinguished, that part of the wire of platinum which had been hottest remained ignited, and continued so for many minutes...

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