Emissivity of straight and helical filaments of tungsten (1918)
National Bureau of Standards · leaf 12
inside and the outside of the turn was focused upon a slit, 1 by0.5 mm, placed so as to have the edges parallel with the turn ofwire. Back of the slit was placed the physical photometer.Several series of measurements on the inside and the outside ofthe turn indicated that the light from within the… … Dark B
Rays and radiation · Lamps and lighting · Heat flow, thermal and thermodynamic processes
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