Temperature of the Carbons of the Electric Arc, fyc. 29 



The 1st column gives the absolute temperature of the platinum. 



2nd deflection on the scale of the radio-micro- 



meter in millimetres. These numbers 

 then represent radiation in arbitrary 

 units. 



3rd radiation calculated by a formula to be 



discussed immediately. 



4th differences between the observed and 



calculated radiation. 



Table I. Radiation of Bare Platinum. 



Table II. Radiation from Blacked Platinum. 



The same results are shown graphically in fig. 3, in which the 

 curve is drawn from the formula through points denoted thus 0, 

 while the experimental points are denoted thus Q 



The curve for bare platinum was taken first, and a simple fourth- 

 power law tried on it ; this was found to agree very closely with the 

 observed results throughout the range of the experiments, except at 



