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- W1993065071 abstract "Specific heat of a tungsten filament at 2425ifmmode^circelsetextdegreefi{}K.---A modification of a method suggested by Smith and ${mathrm{Bigler}}^{1}$ is used, in which the uncertain cooling effects at the ends of the filament are eliminated. A tungsten filament surrounded by a cylindrical anode is heated to incandescence in vacuum by a 60 cycle current. By means of a double strip oscillograph continuous photographic records of the heating-current and of the thermionic current variations are obtained. Since saturation potentials are applied to the anode at all times, the small changes in thermionic current are taken as proportional to the temperature changes. Knowing the magnitude of the temperature changes and the mean power dissipated in the filament, its specific heat is calculated from the theoretical relations deduced by Corbino. The temperature of the filament is determined with a pyrometer for a steady current giving the same thermionic emission as the alternating current under consideration. This temperature is taken to correspond to the mean thermionic current as indicated by a d.c. ammeter. The specific heat of tungsten found by this method is 0.045 for temperatures between 2375 and 2475ifmmode^circelsetextdegreefi{}K, in good agreement with previous determinations. Method of making tungsten seals in Pyrex is described." @default.
- W1993065071 created "2016-06-24" @default.
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- W1993065071 date "1925-05-01" @default.
- W1993065071 modified "2023-10-16" @default.
- W1993065071 title "The Specific Heat of Incandescent Tungsten by an Improved Method" @default.
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- W1993065071 doi "https://doi.org/10.1103/physrev.25.677" @default.
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