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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  1. I. Langmuir, Phys. Rev. 7, 302 (1916).
  2. H. A. Jones and I. Langmuir, Gen. Elec. Rev. 30, 310, 354, 408 (1927).
  3. P. Foote, Bull. Bur. Stanid. 11, 607 (1915).
  4. C. Davisson and J. R. Weeks, Jr., J. O. S. A. 8, 581 (1924).
  5. W. E. Forsythe and E. M. Watson, J. O. S. A. 24, 114 (1934).

Davisson, C.

C. Davisson and J. R. Weeks, Jr., J. O. S. A. 8, 581 (1924).

Foote, P.

P. Foote, Bull. Bur. Stanid. 11, 607 (1915).

Forsythe, W. E.

W. E. Forsythe and E. M. Watson, J. O. S. A. 24, 114 (1934).

Jones, H. A.

H. A. Jones and I. Langmuir, Gen. Elec. Rev. 30, 310, 354, 408 (1927).

Langmuir, I.

H. A. Jones and I. Langmuir, Gen. Elec. Rev. 30, 310, 354, 408 (1927).

I. Langmuir, Phys. Rev. 7, 302 (1916).

Watson, E. M.

W. E. Forsythe and E. M. Watson, J. O. S. A. 24, 114 (1934).

Weeks, Jr., J. R.

C. Davisson and J. R. Weeks, Jr., J. O. S. A. 8, 581 (1924).

Other

I. Langmuir, Phys. Rev. 7, 302 (1916).

H. A. Jones and I. Langmuir, Gen. Elec. Rev. 30, 310, 354, 408 (1927).

P. Foote, Bull. Bur. Stanid. 11, 607 (1915).

C. Davisson and J. R. Weeks, Jr., J. O. S. A. 8, 581 (1924).

W. E. Forsythe and E. M. Watson, J. O. S. A. 24, 114 (1934).

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