260 Capt. W. de W. Abney and Mr. G. S. Edwards. 



Table VIII. 

 | Gelatine plate. See Fig. 8. 



Scale 

 number. 



Mean 





Kelative 



Beduced 

 to maxi- 

 mum 

 of 100. 



Ordinate 

 of curve 



Scale. 



sector 

 reading. 



Opacity. 



sensi- 

 tiveness. 



to wave- 

 length 

 scale. 



Exposure. 



Sector 

 reading. 



Bare 

















glass 



75 











sec. 





8 



691 



51 



17 



9 



8 



380 



9 



81 



47 



28 



45 



23 



22 



300 



101 



8| 



36 



39 



60 



31 



30 



240 



12 



9 



20 



55 



94 



49 



48 



180 



22 



9* 



121 



621 



118 



61 



61 



120 



36 



10 



9 



66 



190 



99 



99 



90 



461 



10i 







194 



100 



100 



60 



60 



10 



9 



66 



190 



99 



100 



30 



70 



11 



10 



65 



165 



85 



86 



15 



751 



12 



HI 



631 



126 



65 



69 







76 



13 



12 



63 



120 



62 



64 







14 



17 



58 



102 



53 



55 







14i 



19 



56 



97 



50 



52 







141 



24 



51 



85 



44 



46 







14| 



27 



48 



78 



40 



41 







15 



35 



40 



62 



32 



33 







15i 



39 



36 



55 



29 



30 







15^ 

 15| 



47 



28 



45 



23 



24 







51 



24 



40 



21 



22 







16 



57 



18 



33 



17 



18 







161 



64 



11 



25 



13 



14 







17 



651 



91 



23 



12 



13 







171 



69 



6 



18 



9 



10 







18 



71 



4 



15 



8 



9 







