EFFECT OF PRESSUEE UPON ARC SPECTRA. 

 TABLE I. (continued). 



211 



(3) Description of Table II. 



Table II. gives in Angstrom units the mean value, of the displacement at each 

 pressure. The first column contains a list of the arbitrary letters assigned to the 

 different lines. The second column gives the wave-lengths of the lines according to 

 KAYSER and RUNGE'S tables. The subsequent columns show the displacements of the 

 lines at different pressures in Angstrom units. The displacement is in each case, 

 towards the side of greater wave-length. The pressures are the excess above one 

 atmosphere. The measurements in brackets, which were made by dotting the plates, 

 have not been plotted in the diagram. 



TABLE II. 



o 



Displacements are in Angstrom units. 



* Impurity (?). 



2 E 2 



