. A determination of the sun's temperature. namic temperature of a radiating bodyand the temperature obtained by radiation methods. If we attempt tomeasure the temperature of a piece of iron at I600°A., by means ofthe total radiation emitted we obtain a temperature which is about400° lower than the true temperature, but if we utilize the radiationcorresponding to a single wave-length, say ^, we obtain a tem-perature which is about 150° lower. I Abbot, The Sun, p. 69. 25 SUMMARY 1 The temperature of the sun has been measured by a new methodbased on Plancks and Wiens laws by radiation for thr
. A determination of the sun's temperature. namic temperature of a radiating bodyand the temperature obtained by radiation methods. If we attempt tomeasure the temperature of a piece of iron at I600°A., by means ofthe total radiation emitted we obtain a temperature which is about400° lower than the true temperature, but if we utilize the radiationcorresponding to a single wave-length, say ^, we obtain a tem-perature which is about 150° lower. I Abbot, The Sun, p. 69. 25 SUMMARY 1 The temperature of the sun has been measured by a new methodbased on Plancks and Wiens laws by radiation for three differentwave-lengths. 2 The variation of the radiation of the sun from the center tothe 11mb ha3 been measured for three different colorB. 3 The absorption of green light in the atmosphere of the earthhas been measured. In conclusion I wish to thank Professor A. P. Carman and Pro-fessor J. Kunz for their many helpful suggestions during the investi-gation of the above problem. Laboratory of Physics University of IllinoisOctober, 1913. i vdeterminationofs00shoo
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