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



Table XVI. 



Edwards' Isochromatic Plate treated with Cyanin. See Fig. 14. 



Scale 

 number. 



Mean 





Relative 



Reduced 

 to maxi- 

 mum 

 of 100. 



Ordinate 

 of curve 



Scale. 



sector 

 reading. 



Opacity. 



sensitive- 

 ness. 



to wave- 

 length 

 scale. 



■ Exposure. 



Sector 

 reading. 















I 



I sees. 





5 



96 



10 



2 



3 *5 



4 



90 



3 



6 



92 



14 



2 *5 



4 



4 *1 



80 



4 



7 



79 



27 



5 



8 



8 *5 



j 60 



6 



8 



64 



42 



8 '5 



11 



12 



50 



7'5 



9 



42 



64 



14 



22 



25 



40 



10 



9i 



32 



74 



18 



29 



17 5 



30 



16 



10 



23 



83 



23 *5 



37 



41 



20 



28 



11 



19 



87 



26-5 



42-5 



47 



j 15 



40 



iu 



XJ. 4 



23 



83 



23 -5 



37'5 



41 



10 



57 



Hi 



29 



77 



19-5 



31 



33 



5 



79 



llf 



36-5 



69-5 



16 



26 



28 







106 



12 



39 



67 



15*5 



25 



26-5 







12| 



33 5 



72-5 



17 



27'5 



29 







12| 



26 5 



79-5 



21 



33-5 



36 







13 



18 



88 



27*5 



44'5 



46 







13i 



11 



95 



38 



61 '5 



64 







13| 



61 

 7 



99i 



55 



88 



92 







13| 



99 



53 



84-5 



89 







14 



9 



97 



44 



69-5 



72 







Uk 



9 



97 



44 



69-5 



70-5 







14| 



6i 



99f 



58 



93 



94-5 







14f 



5| 



100| 



63 



100 



100 







15 



10 



96 



40 



63 



63 







15i 



24 



82 



23 



37-5 



37 







15| 



41 



65 



14-5 



22-5 



22 







15f 



71 



35 



7 



11 -5 



11 







16 



86 



20 



3 



5 



4-5 







