174 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. 



