Thermal Radiation in Absolute Measure. 



555 



Fig. 5. — Carves showing emission of heat from Pt 5 (bright) and Pt 6 

 (sooted), from the same hank of wire, diameter O'Olo centim., at 

 various temperatures. 



100 ISO 200 &0 300 350 400 450 500 550 600 650 700 750 600 

 Tempera Ou re in degrees Centigrade, 



2Q2 



