TABLE 1 53 (continued). 

 STANDARD WAVE-LENGTHS. KAYSER'S IRON (ARC) LINES. 



r = easily reversible. 



175 



Taken from Kayser's Handbuch der Spectroscopie. 



* For reducing to Fabry and Buisson's system of wave-lengths see Table 149 (the accepted standard, 1908) ; tem 

 perature isC, pressure 760 mm. 



SMITHSONIAN TABLES. 



