314 



Sir W. de W. Abney. On the Variation in 

 Fig. 6. 



/ £ 3 4 3 6 7 8 3 

 //umber of exposures for AmyL-ciceCcLte L&mp. 



Table IX. 



Amy] - 

 acetate. 



Scale numbera. 







55 



•4 



406 



31 4 



22 2 







(A 6277) 



(X 5300) 



(A. 4901) 



(A 4584) 



E 



D 























E 



D 



E 



D 



E 



D 



E 



D 



1 



47 



1 



26 



1 



33 



1 



51 



1 



42 



2 



60 



2 



35 



2 



43 



2 



61 



2 



53 



3 



93 



3 



42 



3 



47 



3 



85 



3 



70 



4 



126 



4 



63 



4 



73 



4 



118 



4 



101 



5 



159 



5 



114 



5 



110 



5 



155 



5 



135 



6 



192 



6 



151 



6 



144 



6 



187 



6 



165 



7 



225 



7 



2u2 



7 



186 



7 



225 



7 



202 



8 



242 



















9 



250 



















