Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London, Volume 4Richard Taylor, 1843 |
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Abstracts of the Papers Printed in the Philosophical Transactions ..., Volume 1 Royal Society (Great Britain) Visualizzazione completa - 1832 |
Abstracts of the Papers Printed in the Philosophical Transactions ..., Volume 1 Royal Society (Great Britain) Visualizzazione completa - 1832 |
Abstracts of the Papers Printed in the Philosophical Transactions ..., Volume 4 Royal Society (Great Britain) Visualizzazione completa - 1843 |
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Pagina 341 - By mixing the snow containing these fungi with water, he found that they could be made to vegetate, but that they produced new fungi of a green instead of a red colour. By exposure to excessive cold the primitive fungi are killed, but their seed still retains vitality, and, if immersed in snow, which appears to be their native soil, they reproduce new fungi, which are generally of a red colour. The Philosophical Transactions for 1823 contains the paper by Mr. Bauer already alluded to, entitled "...
Pagina 123 - ... this operation it will be found that the results are sometimes more and sometimes less satisfactory, in consequence of small and accidental variations in the proportions employed. It happens sometimes that the chloride of silver is disposed to darken of itself, without any exposure to light : this shows that the attempt to give it sensibility has been carried too far. The object is to approach to this condition as near as possible without reaching it, so that the substance may be in a state ready...
Pagina 459 - President, Council, and Fellows of the Royal Society of London, for improving Natural Knowledge.
Pagina 388 - On the Transparency of the Atmosphere, and the Law of Extinction of the Solar Rays in passing through it," published in the Philosophical Transactions for 1842.
Pagina 310 - Dry the paper cautiously at a distant fire, or else let it dry spontaneously in a dark room. When dry, or nearly so, dip it into a solution of iodide of potassium, containing 500 grains of that salt dissolved in one pint of water, and let it stay two or three minutes in the solution.
Pagina 123 - This paper, if properly made, is very useful for all ordinary photogenic purposes. For example, nothing can be more perfect than the images it gives of leaves and flowers, especially with a summer sun: the light passing through the leaves delineates every ramification of their nerves.
Pagina 334 - ... or in other words the force of the current is equal to the sum of the electro-motive forces divided by the sum of the resistances.
Pagina 123 - We shall find (especially if the paper has been kept some weeks before the trial is made) that its sensibility is greatly diminished, and, in some cases, seems quite extinct. But if it is again washed with a liberal quantity of the solution of silver, it becomes again sensible to light, and even more so than it was at first. In this way, by alternately washing the paper with salt and silver, and drying it between times, I have succeeded in increasing its sensibility to the degree that is requisite...
Pagina 337 - The strength of a pillar, with one end rounded and the other flat, is the arithmetical mean between that of a pillar of the same dimensions with both ends round, and one with both ends flat. Thus, of three cylindrical pillars, all of the same length and diameter, the first having both its ends rounded, the second with one end rounded and one flat, and the third with both ends flat, the strengths are as 1, 2, 3, nearly.
Pagina 248 - A constant voltaic battery, consisting of a few elements of very small dimensions, is interposed in any part of the circuit. By this arrangement, the circuit is periodically made and broken, in consequence of the spring resting for one second on a metal division, and the next second on a wooden division. The circuit may be extended to any length ; and any number of electro-magnetic instruments may be thus brought into sympathetic action with the standard clock. It is only necessary to observe, that...