Physical ReviewAmerican Physical Society, 1913 In Feb. 1903, the separate publication of the Bulletin of the American Physical Society was discontinued and Its Proceedings published in the Physical review. |
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AMERICAN PHYSICAL SOCIETY amperes anode apparatus bolometer brass bulb Bureau of Standards carbon cathode cent circuit coefficient coil College column constant copper correction curve cylinder decrease determined diameter disc discharge current distance drop effect electrical electrometer electrons emission energy equation error experimental experiments filament film formula galvanometer gases given glass heating hydrogen increase Instructor in Physics insulation lamp liquid air magnetic field manometer Mass maximum means measured mercury metal method molybdenite nitrogen observations obtained ohms oxid oxygen Phil Phys plate platinum Poiseuille's law positive ions potential difference Professor of Physics rays reflection resistance Röntgen rotations saturation current selenium shown shows space charge spark gap spectrum stibnite surface Table temperature theory thermionic current thickness tube tungsten Univ University V₁ vacuum vapor pressure velocity Volta effect voltage volts wave-lengths wire Young's modulus
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Página 503 - If reactances be substituted instead of inductances 1 Abstract of a paper presented at the New York meeting of the Physical Society, October 18, 1913.
Página 139 - These results illustrate very clearly the sort of consistency obtained in these observations. The largest departure from the mean value found anywhere in the table amounts to 0.5 per cent and "the probable error" of the final mean value computed in the usual way is 16 in 61,000. Instead, however, of using this final mean value as the most reliable evaluation of e, it was thought preferable to make a considerable number of observations at atmospheric pressure on drops small enough to make...
Página 77 - ... 1 Abstract of a paper presented at the Washington meeting of the Physical Society, April 25 to 26, 1913.
Página 507 - JS Ames, professor of physics, director of physical laboratory, Johns Hopkins University, Baltimore, Md. LA Bauer, director department of research in terrestrial magnetism, Carnegie Institution of Washington, Washington, DC William Bowie, Chief Division of Geodesy, United States Coast and Geodetic Survey, Washington, DC Henry Crew, professor of physics, Northwestern University, Evanston. 111. CF Marvin...
Página 297 - Richardson3 advanced the theory that "the effect of hydrogen is due to some changes it produces in the platinum surface"; he discusses this hypothesis at some length in the concluding paragraphs of the article referred to. In the face of these experiments the writers are of the opinion that the weight of evidence is in favor of Richardson's view that the positive 1 The wire was not removed from its supports in any of these operations; otherwise criticism might justly be offered on the grounds of...
Página 406 - ... is attained and narrow enough that the contour of the curves is not distorted; we have found a 2° interval satisfactory. 5. The sensibility of the apparatus indicating temperatures and differences of temperature should be of the order of 0.01° and time should be measured to better than 0.2 second. Among the results of this investigation may be mentioned the demonstration that the inverse rate and differential methods, the latter plotted as the derived differential curve, give identical results...
Página 457 - Let us consider a wire of radius a placed in the axis of a cylinder of radius r. Let i be the thermionic current per unit of length from the wire. For the case of symmetrical cylindrical coordinates...
Página 406 - Small samples (i g. or so) give sharper results than large samples. 4. The interval of recording temperatures should be wide enough that sufficient sensibility is attained and narrow enough that the contour of the curves is not distorted; we have found a 2° interval satisfactory. 5. The sensibility of the apparatus indicating temperatures and differences of temperature should be of the order of 0.01° and time should be measured to better than 0.2 second.
Página 423 - If the temperature of the filament is low, only a small number of electrons escape from it and, consequently, only a small discharge current (the saturation current) can be sent through the tube. Increasing the impressed voltage above that needed for this current value causes no further increase in current. It simply increases the velocity of the cathode rays and hence the penetrating power of the Rontgen rays. a Lzoo *: 4l...
Página 117 - The substitution in this equation of an approximately correct value of e yields a with an error but one third as great as that contained in the assumed value of e.