Radiation Energy of Nickel

The Radiant Energy of Nickel and Nichrome.

Y. A. Suydam found that the total radiation energy, E, from heated nickel wires between 463° K. and 1283° K. can be represented by E=cTⁿ, where c, and n are constants, and T denotes the absolute temp. V. A. Suydam's value for n is 4.648 between 463° K. and 1283° K. W. del Regno gave n=4.588; and M. Kahanowicz found n – 5.5 between 273° K. and 903° K. The subject was studied by H. Schmidt and E. Furthmann, A. G. Worthing, W. Geiss, A. L. Helfgott, and G. R. Greenslade. V. A. Suydam's values are plotted in Fig. For 0.0002 mm. press. The temp, is expressed in °K., and the energy, E, in watts per sq. cm.:

T° K	463°	603°	661°	773°	883°	951°	1071°	1181°	1283°
E	0.0258	0.1000	0.1526	0.2408	0.4498	0.7012	1.2553	1.9324	2.9572

B. T. Barnes obtained for the total emissivity of soot-covered nickel:

	400°	600°	700°	800°	900°	1000°	1100°	1200°	1300°	1400°
Sooty	0.096	0.59	1.09	1.87	3.0	4.8	7.2	-	-	-
Polished	0.0092	0.079	0.166	0.310	0.55	0.91	1.44	2.17	3.17	4.49

C. L. Utterbach obtained for nickel E = c₁T^5.29 for temp, between 650° K. and 1400° K., and E = c₂T^4.75 between 1450° K. and 1600° K. There is a break in the value for nickel at about 1450°. C. Hurst, and A. G. Worthing also studied the spectral emissivity of nickel; J. K. Roberts, the energy between the atoms of helium and the surface of nickel; H. B. Wahlin, the emission of positive ions by heated nickel; and N. C. Beese, R. S. Bartlett, G. W. Fox and R. M. Bowie, M. Benjamin, and B. J. Thomson, the thermionic emission from wires coated with barium oxide. C. J. Davisson and L. H. Germer observed a discontinuity near 1-3 A., for the electron waves from nickel.