366 



Mr. H. E. Ives on a 



represented by a straight line when plotted against the 

 logarithm of the intensity, critical speeds for other ratios of 

 the fields should plot as straight lines lying below and 



Fig. 5. 



30 



20 



c 

 o 



O 



Q> 

 I/) 



1- 



0) 



-0) 



o 

 U 10 



i; 















d 









""■"""S^^ 









\o 











V*' ' 























20 

 



16 

 •4 



14 

 •6 



1-2 

 •8 



1-0 

 10 









~~~~J~Z^ ==== -- - 



Critical frequencies for various ratios of brightness of two compared 

 fields. Full lines, calculated curves for log d B = — 30. 



inclined to this at such angles that all will meet at a point 

 on the axis of abscissae. In our previous experimental work 

 we did not get satisfactory confirmation of this equation. 



