I/O 



Tables 149-151. 

 STANDARD WAVE-LENGTHS. 



TABLE 149. —Standard Iron Lines. Fabrr-Bulsson Values. 



Referred to the Cd line, \=6438.4722. 



Source: electric arc; current: 3-5 amperes; voltage: generally no volts. 



Taken from Fabry and Buisson, Astrophysical Journal, 28, iqo8. 

 • These columns give the differences: Fabry-Buisson minus the corresponding iron line in Rowland's Preliminary 

 Table of Solar Spectrum Wave-lengths. 



TABLE 150. — Absolnte WaTe-length ol Red Cadmium Line In Air, 760 mm. Pressure, 16° 0. 



6438.4722 Michelsen. 



6438.4696 Fabry and Perot. 



For arc and spark lines of titanium, manganese, and vanadium (on above system of wave-lengths), see Kilby, 



Astrophysical Journal, 30, igog. 



TABLE 161. — Some of the Stronger Lines of Some of the Elements. 



Smithsonian Tabucsi 



