A PLATINUM SURFACE AT HIGH TEMPERATURES. 



523 



TABLE XVII. On the Law of Thermal Radiation. 



Heat received by the Bolometer ; Sensitive Surface coated with Platinum Black ; 

 Temperature of the Bolometer, 17 C. (See figs. 10 and 11.) 



. ,. .. , . ii T ii- L f Radiator No. R.,. . . . 4C 



Radiation received from palladium at its melting point . . < ^ j^-' .^j- 



n . .. T f ii' i j.- f Radiator No. R.i n 



Radiation received irom melting platinum < x . -> 



I ii 1>o - "vt 



407 

 396 



. . 830 

 804 



Heat received l>y o Thermopile, the Sensitive Surface of which was coated with 



Lamp Black. 



3X2 



