270 



Sir James Dewar 



[Jan. 16, 



between wave length of maximum radiation intensity from black 

 body and absolute temperature — viz. XT - 2930, where A. is the 

 wave length in microns (/x) and T is the absolute temperature. Some 



200 



GRam Calories. 



per (Crr,)* pe' Cay 



EnERCY DlSTRlBVJTiOr 



IO 20 30 40 50 ** SO 



Fig. 16. — Heat Spectrum at Three Different Temperatures. 



typical temperatures and wave lengths calculated from this formula 

 are given in Table IV. 



Table IV. 



