Philosophical MagazineTaylor & Francis, 1806 |
Innhold
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Populære avsnitt
Side 65 - ... a sieve. The feathers should be afterwards well washed in clean water, and dried upon nets, the meshes of which may be about the fineness of cabbage-nets. The feathers must be from time to time shaken upon the nets, and as they dry will fall through the meshes, and are to be collected for use.
Side 97 - Dated October 21. To Elihu White, of Threadneedle-street, in the city of London, gent, in consequence of a communication made to him by...
Side 235 - In short, whether we are considering the sources of extended exertion or of accumulated energy, whether we compare the accumulated forces themselves by their gradual or by their sudden effects, the idea of mechanic force in practice is always the same, and is proportional to the space through which any moving force is exerted or overcome, or to the square of the velocity of a body in which such force is accumulated.
Side 189 - Middlesex, in consequence of a communication made to him by a certain foreigner residing abroad...
Side 126 - Efforts were soon made by every plant to generate runners and tuberous roots; but these were destroyed as soon as they became perceptible. An increased luxuriance of growth now became visible in every plant, numerous blossoms were emitted, and every blossom afforded fruit. Conceiving, however, that a small part only of the true sap would be expended in the production of blossoms and seeds, I was anxious to discover what use nature would make of that which remained ; and I therefore took effectual...
Side 94 - Nevashda did not lose a single man. It is already known that their fresh water was preserved in charred casks, but it is not so generally known that they used the same precaution for preserving their salted provisions. The beef they carried out with them tasted as pleasantly upon their return as it did three years before, when first salted.
Side 125 - The immediate effect of gravitation is certainly to occasion the further depression of every branch, which extends horizontally from the trunk of the tree ; and, when a young tree inclines to either side, to increase that inclination : but it at the same time attracts the sap to the under side...
Side 124 - ... the cortical vessels are during this period much distended and full of moisture ; and as the medulla certainly does not carry any fluid in stems or branches of more than one year old, it can scarcely be suspected that it, at any period, conveys the whole current of the descending sap. As the leaves grow, and enter on their office, cortical vessels, in every respect apparently similar to those which descended from the cotyledons, are found to descend from the bases of the leaves ; and there appears...
Side 122 - I conceive that the influenpe of gravitation must have been wholly suspended. In a few days the seeds began to germinate, and, as the truth of some of the opinions I had communicated to you, and of many others which I had long entertained, depended on the result of the experiment, I watched its progress with some anxiety, though not with much apprehension ; and I had soon the pleasure to see that the radicles, in whatever direction they were protruded from the position of the seed, turned their points...
Side 228 - ... to 4 they might strike at the same instant against the pegs opposite to them, the ball of clay would not be moved from its place to either side ; nevertheless the peg impelled by the smaller body B, which has the double velocity, would be found to have penetrated twice as far as the peg impelled by A.