480 Mr. E. Talbot Paris on the Polarization of 



different diameters are plotted against 0. tj is, of course, 

 calculated for the wave-length in water, viz. f x 550 fifi. 



Fig:. 6. 



+ 30 



+ 40 - 



+ 20 - 



? 



-40 - 



-SCH 



Experimental polarization curves for silver particles in water 

 (X=550/i/*J. 



5. Comparison of Theoretical with Experimental Results. 



On comparing the curves in fig. 6 with those in fig. 4, it 

 will be seen that, in a general way, as the particles increase 

 in size, the polarization of the scattered light follows the 

 lines indicated by theory. Thus, when the particles are very 

 small, the maximum is at 90° to the incident beam; as the 

 particles increase in size the maximum moves away, making 

 an angle greater than 90° with the incident beam ; for still 

 larger particles a neutral point and a reversal appear. Now, 

 in figs. 2 and 3, when ?? = 2, there are two neutral points, 

 two maxima and a minimum. Nothing corresponding to 

 this was observed in any of the experiments. In fig. 6 the 

 curve for 77 = 1*96 is more like what would have been expected 



