254 Capt. W. de W. Abney and Mr. GL S. Edwards. 



Table II. 



AgCl. (Gelatine plate.) See Fig. 2. 



Scale 

 number. 



Mean 





Relative 



Reduced 

 to maxi- 

 mum 

 of 100. 



Ordinate 

 of curve 



Scale. 



sector 

 reading. 



Opacity. 



sensi- 

 tiveness. 



to wave- 

 length, 

 scale. 



Exposure. 



Sector 

 reading. 



Bare 













mins. sees. 





glass 



73! 















10| 











1 



15 



72f 



11 



73! 









6 



30 



66! 



m 



72 



l! 



17 



20 



19 



1 



43! 



12 



66 





30 



35 



34 



1 on 



Zo 



12! 



60! 



13 



37! 



44 



43 



2 



11 



13 



54! 



19 



45 



53 



52 







1Q1 



J-O4 



Ol 



091 



OU 



£Q 



oy 



Do 







13| 



44| 



29 



58! 



69 



69 







13f 



39 



33! 



66 



78 



78 







14 



33 



40! 



75 



88 



88 







14i 



29 



44! 



81 



95 



95 







14| 

 14f 



28 



44! 



82! 



97 



97 







26 



46! 



85! 



100 



100 







15 



29 



43! 



81 



95 



95 







15i 



33 



39! 



75 



88 



88 







15! 



39 



33! 



66 



78 



79 







15f 



45! 



28 



57 



67 



67 







16! 



48 



24! 



54 



64 



65 







16 



53 



19! 



47 



55 



57 







16| 



56 



16! 



43 



50 



51 







IV 



59! 



14 



39 



46 



47 







m 



67 



5! 



28 



33 



34 







18 



72 



1! 



17 



20 



20 







18! 



73! 









10 







19 











5 







