Effect of the Spectrum on the Haloid Salts of Silver. 267 



Table XV. 



Edwards' Isochromatic Plate. See Fig. 13. 



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. 















sees. 





5 



130 



- 8 



2 



1'7 



2 



180 



16 



6 



128 



10 



3 



2-5 



2-5 



1 9fk 



99 



7 



120 



18 



5 



4-4 



4-5 



100 



29 



n 



112 



26 



7 



6 



6 



80 



42 



o 



J.UD 



<*9 



Q 



7 •« 



o 



60 



16 



8f 



100 



38 



11 



9-6 



10 



50 



22 



9 



75 



63 



19 



16-6 



18 



44 



30 



9| 



63 



75 



22 5 



19 8 



21-5 



30 



44 



10 



50 



88 



27 5 



24 



25 



25 



56 



m 



46 



92 



29 



25 -4 



27 



20 



72 



ii 



50 



88 



27-5 



24 



25 



15 



88 



iH 



66 



72 



22 



19 2 



20 



10 



104 



IH 



78 



60 



18 



15-8 



16 



5 



120 1 



12 



90 



48 



14 5 



12-6 



12-5 







138 ! 



m 



74 



64 



19 5 



17 



17 







12* 



53 



85 



26-5 



23 



23-5 







12| 



26| 



111* 



44 



39-5 



40 





1 



13 



m 



120| 



57 



50 



50 







13i 



6 



132 



102 



91 



92 







13* 



5f 



132i 



115 



100 



100 







13f 



6* 



131* 



106 



92-5 



93 







14 



10 



128 



83 



72 5 



71 







14i 



63 



71 



22-5 



19-6 



19 







14* 



120 



18 



5 



4-7 



4 





1 



15 



138 













1 

 1 



