AS MEASURED BY MEANS OF THE RADlOMlCROMETEK. 



70 



As with the curves representing the solutions of praseodymium chloride, 

 these curves show that Beer's law holds quantitatively for solutions of the 

 nitrate. Neither the position nor the intensity of the band is altered more 

 than the limits of error of our work for the range of dilution studied. It 

 may be recalled that this is in exact agreement with the photographic results 

 recorded elsewhere in this monograph. 



SALTS OF NICKEL. 



Table 18 gives the percentage transmission of the nickel salts studied. 

 Beginning at the left of the table, column 1 gives X, taken at such intervals 

 as the solutions required, and reading towards the right are the results for 

 the following salts: nickel chloride, depth of cell 3 mm., concentration 2.74 

 normal; nickel nitrate, depth of cell 5 mm., concentration 1.68 normal; nickel 

 sulphate, depth of cell 5 mm., concentration 1.108 normal, respectively. 



Curves representing these results are given in figs. 36, 37, and 38. 



Table 18. Percentage Transmissions of Solutions of Nickel Salts. 



Nickel Chloride. 



Fig. 36, the curve for nickel chloride, shows an increasing absorption from 

 70 per cent transmission at X5200 to complete absorption at X6300. From 

 this point there is complete absorption to the regions X7200, and then a 

 gradual increase in transmission, reaching a maximum of 53 per cent near 

 X9000, then decreasing again to zero transmission at X10000. 



As has been shown photographically, the visible spectrum of salts of 

 nickel consists of intense broad absorption bands both in blue and red, 



