DETERMINATION OF HIGH TEMPERATURES BY REFRACTED RAYS. 463 



Curves of Luminous Intensity. 



A B 



'^^ luwo HUO VMO 1300 Temperatures. 



A. Becquerel's curve. Total luminous intensity. 



B. Author's curve. Total luminous intensity. 



Thin and broken curves. Becquerel's homogeneous rays. 



with that of the radiating lime, and of a thickness of 2 or 3 millims., was sup- 

 ported by means of a platinum wire in the flame of a good Bunsen burner, 

 the position in the flame having been found by experiment to maintain the 



