Proceedings of the American Academy of Arts and Sciences, Том 16Metcalf and Company, 1881 Vol. 12 (from May 1876 to May 1877) includes: Researches in telephony / by A. Graham Bell. |
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AgBr air-dried salt alcohol Algol Ångström anthracene appeared baric baric hydrate barium barium salt BaSO Bolometer Boston brightness bromine Calculated Cambridge carbonate centre Chem column gives comparison stars computed corresponding crystals curve deflection determined diameter dibromacrylic disk distance eclipse ephemeris equal equation equatorial belt ether experiments foliis formula galvanometer given grades Gray H₂O Harvard College Observatory heat hydrobromic acid ignition inches Jupiter light light curve lines Lissajous curves magnetic magnitude mark mean measures melting method minima minimum minutes motion mucobromic acid nearly observations Observatory obtained orbit oxide P₂O pappo pappus period of rotation Persei phenanthrene phospho-tungstates photosphere plane portion precipitate prism produced Professor Professor Gibbs proper motion radiation red spot residuals Rumford salt gave satellite Schönfeld sodic solar soluble spectrum strip substance gave Table telescope temperature thermopile tion variable variable stars velocity wave-lengths
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Страница 140 - 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 the sun's atmosphere has nothing to do with the production of this singular phenomenon.
Страница 260 - Lyree, ijAquilce, and 8 Cephei, have been observed with great care, so that their variations are known with much precision. Each will therefore be discussed in turn, according to the following method. As the variation is periodic, it will be convenient to denote the time by an angle, v, such that 360° shall correspond to one period or revolution of the star. We now wish the light * Poggendorff's Annalen, xxxiii.
Страница 390 - We should then expect that somewhat more light would pass through the edges, and accordingly that the light would vary slightly during the whole obscuration, attaining a true minimum when the centres of the star and satellite appeared to coincide. In a recent note Dr. Vogel informs me that he has found no perceptible approach or recession of Algol by means of the spectroscope.* If this observation is confirmed with the other similar variables, we should infer that the masses of the eclipsing satellites...
Страница 462 - Ilaiiy, however, was highly artificial, and only prepared the way for a simpler and more general expression of the facts. The German crystallographer, Weiss, seems to be the first to have recognized the truth that the decrements of Haiiy were merely a mechanical mode of representing the fact that all the secondary faces of a crystal make intercepts on the edges of the primitive form which are simple multiples of each other ; and, this general conception once gained, it was soon seen that these ratios...
Страница 272 - If we admit a common origin to the stars of the Milky Way, a general coincidence in their axes of rotation seems not improbable, especially as such an approximate coincidence occurs in the members of the solar system. If the coincidence was exact, the direction must be that of the poles of the Sun, or, approximately, that of the pole of the ecliptic. On the other hand, since the stars of the Milky Way are supposed to be arranged in the general form of a flattened disk, we should more naturally expect...
Страница 270 - No natural explanation can be offered for such terms, and the reduction might be thought accidental did it not occur in so many different curves. A careful distinction must be made between these terms and those which might be assumed empirically, since their form is clearly pointed out by the residuals. If we tried to represent the residuals by a function of 4...
Страница 443 - Report on the Florida Reefs. By Louis Agassiz. Accompanied by illustrations of Florida Corals, from drawings by A. Sonrel, Burkhardt, A. Agassiz, and Roetter. With an explanation of the plates, by LF Pourtales. Published by permission of AD Bache and Carlile P. Patterson, Superintendent of the U.
Страница 461 - Miller was subsequently a member of a new Royal Commission for " examining into and reporting on the state of the secondary standards, and for considering every question which could affect the primary, secondary, and local standards"; and in 1870 he was appointed a member of the " Commission Internationale du Metre.
Страница 358 - They are hitherto unpublished, and they at least, though as yet approximative, shaw that the heat maximum in a normal spectrum is not in the ultra-red, but is at least as far up the spectrum as the orange near D ; and this result may be relied on, any smaller values below A = .0007, as well as all favorable atmospheric circumstances (high sun, blue sky, etc.), rather tending to move it toward the violet. These measures show a certain approximation of the '' heat " curve to the "light " curve, though...
Страница 153 - In working with the tube, in which a piece of sheet platinum is rendered incandescent by the concentration upon it of electrified particles repelled from a concave mirror, I noticed that when the mirror was made the negative electrode, so that this concentration took place, a clear and quite musical note issued from the tube. I thought at first that the pitch of...