The Annual of Scientific Discovery: Or, Year-book of Facts in Science and Art

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130 페이지 - To an aqueous solution of prot-iodide of iron add first an equal volume of acetic acid, and then ten volumes of alcohol. Allow the mixture to repose two or three days. At the end of that time it will have changed color, and the odor of acetic acid, as well as that of alcohol, will have disappeared, and the liquid will have acquired a peculiar but agreeable vinous odor. It is in this state that I prefer to employ it. 6. Into the iodide thus prepared and modified the plate is dipped for a few seconds....
186 페이지 - The flax fibre, soaked in the solution of sub-carbonate of soda, was no sooner immersed in the vessel containing the acidulated water than its character became at once changed from that of a damp, rigid aggregation of flax to a light, expansive mass of cottony texture, increasing in size like leavening dough, or an expanding sponge.
19 페이지 - ... substances to the acting medium at certain intervals, or at each successive stroke of the motive engine — the principal supply of caloric being thereby rendered independent of combustion or consumption of fuel. Accordingly, whilst in the steam engine the caloric is constantly wasted by being passed into the condenser, or by being carried off into the atmosphere, in the improved engine, the caloric is employed over and over again, enabling me to dispense with the employment of combustibles,...
117 페이지 - Assuming, therefore, that the sun's light is the result, of some peculiar action by which it brings forth into visible existence the element of light, which I conceive to be latent in, and diffused throughout, space, we have but to imagine the existence of a very probable condition, namely, the unequal diffusion of this lightyielding element, to catch a glimpse of a reason why our sun may, in common with his solar brotherhood, in some portions of his vast stellar orbit, have passed, and may yet have...
292 페이지 - Gila, in February last, he observed two large pieces of meteoric iron, which were used by the blacksmiths of the town for the purposes of an anvil. He was unable to procure any specimens from these bodies, but was guided to a canon between two mountain ridges in the immediate vicinity, from which both pieces had been taken, where the masses of the meteorites were so abundant as to have given name to the canon.
304 페이지 - Teschemaeher stated the results of his study respecting the traces of vegetation in coal. This communication, given below, is one of the most important contributions to our knowledge of the character and composition of coal ever laid before the public. Mr. Teschemacher said : — " My observations have been entirely confined to the traces of vegetation in the coal itself, omitting those in the shales accompanying the coal. A previous study of these latter was, however, indispensable. I believe, however,...
220 페이지 - Playfair, we have given the result of some examinations of stalactites from caverns in Germany, and from the vaults of old castles upon the Rhine, made with the view of ascertaining the fact of the presence or absence of organic matter in these bodies, either combined or uncombined. The result may be 'stated in the words of the author, Prof. LIEBIG : The stalactites from the caverns " contain no trace of vegetable matter, and no humic acid, and may be heated to redness without becoming black.
286 페이지 - Pseudotrappean and magnesian rocks are consumed much like wood in a slow fire, and go to form sulphate of magnesia and other products. Granite is rendered so soft that you may crush it between your fingers, and cut it as easily as bread unbaked. The feldspar appears to be converted partly into alum. In the mean time, the boulders and.
387 페이지 - London ever since 1844, according to Mr. Glaisher's diagram, and will reach its minimum in 1851. It can be stated only as a conjecture, though by no means an improbable one, that Sir John Franklin entered Lancaster Sound at the close of a group of warm years when the ice was in the most...
111 페이지 - ... sum of the external powers of a system, unaltered at its origin, is definite and cannot be changed ; so any alteration either of intensity or direction amongst the lines of force at one place, must be accompanied by a corresponding change at every other. So if a mass of soft iron on the east side of a magnet causes a concentration of the lines of force from the magnet on that side, a corresponding expansion or opening out of the lines on the west side must be and is at the same time produced...

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