280 Drs. J. T. Bottomley and J. C. Beattie. 



Fig. 5. — Curves Blowing emission of heat from Pts (bright) and Pfg (sooted), from 

 the same hank of wire, diameter 0*015 cm., at various temperatures. 



50 too f50 £00 250 500 S50 ^ 500 550 600 650 700 750 BOO 



TemperdCure in decrees Centigrade, 



