[pratt] 



ABSORPTION OF LIGHT 



163 



the rubber, from which the percentage absorption can be readily 

 calculated. 



The following tables show the results obtained from four sets of 

 readings. Table V shows the percentage absorption as obtained in 

 each of the four separate sets and an average of the four sets is shown 

 in Column No. 5 of Table V, from which an average curve was plotted 

 and is shown in Fig. 4. 



TWO 



iOOO JOOO 



Figure 4 



^^oa 



3000 



In each of the following tables, Column No. 1 gives the wave 

 length in Angstrom Units; Column No. 2 gives rate of drift, light 

 falling direct; Column No. 3 gives rate of drift, light passing through 

 rubber; Column No. 4 gives percentage absorption. 



