1/4 TABLE 153. 



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



r= easily reversible. 



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); tempera- 

 ture 15 C, pressure 760 mm. 



SMITHSONIAN TABLES. 



