Abstract

The radiation of energy from a thoriated tungsten filament and the absorption of the energy radiated from the surrounding bulb have been measured by a method which eliminates difficulties arising from cooling effects of the leads. For a filament at a uniform temperature <i>T<sub>F</sub></i> in a bulb at temperature <i>T<sub>B</sub></i> the net radiation <i>W</i> in watts cm<sup>-2</sup> is the difference between the outgoing radiation <i>W<sub>R</sub></i> and the absorbed radiation <i>W<sub>A</sub></i>. For values of <i>T<sub>F</sub></i> from 225° to 580°K and <i>T<sub>B</sub></i> from 77° to 473°K log <i>W<sub>R</sub></i>=83.7105-100+5.332 log <i>T<sub>F</sub></i>, log <i>W<sub>A</sub></i>=83.7105-100+4.462 log <i>T<sub>B</sub></i>+0.87 log <i>T<sub>F</sub></i>. The resistivity <i>R</i><sub>0</sub> in this same range is given by log <i>R</i><sub>0</sub>=91.7123-100+1.23 log <i>T<sub>F</sub></i>. The characteristics, current, voltage, resistance, and energy radiated as functions of temperature are tabulated.

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