676 



HANDBOOK OF PHOTOGRAPHY 



3.0 



-^ 



2.0 



1.0 







0.6 L2 1.8. 2.4 

 Log Exposure Crela+ive) 



Fig. 19^. — Z)-logio .B curves 

 of DuPont positive film, No. 

 213. 



2 3 



Minu+es 

 Fig. 195. — Time-gamma curve of Du- 

 Pont positive film, No. 213. 



Fig. 19C. — Spectrogram of DuPont positive film No. 213 (tungsten). 



3.80 

 3.60 

 3.40 

 3.20 

 3.00 

 2.80 

 2.60 

 2.40 

 >)2.20 

 «2.00 

 ^1.80 

 1.60 

 1.40 

 1.20 

 1.00 



aso 



0.60 

 040 

 0.20 



Fig. 20A. 



1.05 



2j05 



0.05 1.05 



Log Exposure 



-D-logio E curves of Eastman duplicating positive No. 1355. 



