106 



burgess: wien s spectral equation 



between 14200 and 14700 when X is expressed in /x (0.001 mm.) 

 and temperatures in centigrade absolute. 



Equations (1) and (2) are identical in form and may be treated 

 together. Equation (3) is of only limited interest in temperature 



1200 



1100 



1000 



a 900 



LI 



r- 

 Ul 



5 800 



O 



E 



>- 



0. 700 



600 



O 



r- 



U) 



z 

 o 



I- 500 



o 



Id 

 oc 



o * 00 

 o 



300 



200 



100 



800 1000 1200 14-00 1600 1800 2000 2200 2400 2600 2800 

 OPTICAL PYROMETER READINGS CENTIGRADE 

 RED LIGHT X=0.65 fj. 

 Figure 1. Graphic solution of Wien's spectral equation. 



measurements, 1 and may be treated graphically by plotting h/h 

 against T for the wave lengths used. 



1 Thiirmel, Ann. der Phys., 33: 1139-1160. 1910. Wilsing and Schemer, 

 Pub. Astiophys. Obs. Potsdam, No. 56, 19. 



