Proceedings of the American Academy of Arts and Sciences, المجلد 16Metcalf and Company, 1881 Vol. 12 (from May 1876 to May 1877) includes: Researches in telephony / by A. Graham Bell. |
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Academy AgBr alcohol Algol Ångström anthracene appeared Arthur Auwers baric barium barium salt Bolometer Boston brightness bromine Calculated Cambridge carbonate centre Chem Coast Survey column gives comparison stars corresponding crystallography crystals curve deflection determined diameter dibromacrylic disk distance eclipse ephemeris equal equation equatorial belt error ether experiments foliis formula galvanometer given grades Gray H₂O Harvard College Observatory heat hydrobromic acid ignition inches Jupiter L. F. Pourtalès light light curve lines Lissajous curves magnetic magnitude mathematical mean measures melting meridian method minima minimum minutes motion mucobromic acid nearly observations Observatory obtained orbit oxide P₂O paper pappo pappus period of rotation Persei phenanthrene phospho-tungstates plane portion precipitate produced Professor Peirce proper motion red spot residuals Rumford satellite Schönfeld sodic solar soluble solution spectrum strip substance gave Table telescope temperature thermopile tion variable variable stars velocity
مقاطع مشهورة
الصفحة 411 - Die Energie der Welt is Konstant. Die Entropie der Welt strebt einem Maximum zu" (The energy of the world is constant. The entropy of the world strives to overcome it).
الصفحة 249 - IV. Stars whose light is continually varying, but the changes are repeated with great regularity in a period not exceeding a few days. Examples, ft Lyrce and 8 Cephei.
الصفحة 413 - O functions without expecting to arrive immediately at complete expressions of them. Only in the simplest case, that of gases, have I been able to write the equation expressing such a function for a body of variable composition, and here the equation only holds with a degree of approximation corresponding to the approach of the gas to the state which we call perfect. " Gratefully acknowledging the very favorable view which you have taken of my efforts, I remain, gentlemen, very truly yours, "J. WILLARD...
الصفحة 412 - ... expressed, and by applying this to various cases we are led at once to the special conditions which characterize them. We thus obtain the consequences resulting from the fundamental principles of thermo-dynamics (which are implied in the definitions of energy and entropy) by a process which seems more simple, and which lends itself more readily to the solution of problems, than the usual method, in which the several parts of a cyclic operation are explicitly and separately considered. Although...
الصفحة 138 - FRADNHOFER discovered the lines in the solar spectrum, known by his name, in 1814. Many efforts to determine their origin followed. One of the most ingenious and carefully considered was that of Professor Forbes in 1836.* He concluded that, if their origin is in the solar atmosphere, the light from the limb must exhibit stronger lines than that from the centre. His method was to examine the spectrum before and during an annular eclipse ; as he found no recognizable change, his deduction was, " that...
الصفحة 410 - When the history of the dynamical theory of heat is written. the man who, in opposition to the scientific belief of his time, could experiment and reason upon experiment, as Rumford did in the investigation here referred to. cannot be lightly passed over.
الصفحة 3 - I might be determined by the following method. Suppose that an electric current be passed through a platinum-iridium wire heating it to incandescence, and that the brightness of a short portion of it be compared with an artificial star when the current is varied by a known amount. As the current increases, the color of the light changes, the amount of the blue light increasing more rapidly than that of the red. The ratio of the two may be determined by inserting a double-image prism in the collimator...
الصفحة 453 - ... of crystallography, and he accomplished a most important work in attracting to the same study young Miller, who brought his mathematical training to its elucidation. It was the privilege of Professor Miller to accomplish a unique work, for the like of which a more advanced science, with its multiplicity of details, will offer few opportunities. The foundations of crystallography had been laid long before Miller's time. Haiiy is usually regarded as the founder of the science ; for he first discovered...
الصفحة 459 - Mineralogy" which he published in 1852 in connection with HJ Brooke owed its chief value to a mass of crystallographic observations which he had made with his usual accuracy and patience during many years, and there tabulated in his concise manner. As has been said by one of his associates in the Royal Society, " it is a monument to Miller's name, although he almost expunged that name from it."* It is due to Professor Miller's memory that his works should be collated, and especially that by a suitable...
الصفحة 433 - Musenm could not have taken the place it now occupies. If he did not live to see the realization of his scientific hopes, he lived at least long enough to feel that their fulfilment is only a matter of time.