MOTION-PICTURE PHOTOGRAPHY 



667 



stocks supplied by the Eastman Kodak Co., the Agfa Ansco Corp., and the DuPont 

 Fihn Manufacturing Corp. will be named and described on the basis of data on 



0.65 1.65 2.65 



Log Exposure 



Fig. QA. — Z)-logio E curves of Eastman duplicating negative, Fast No. 1505 (ortho- 

 chromatic) . 



120 



1.00 



n 0.80 



i 060 



5 0.40 



0.20 



L20 

 LOO 

 0.80 

 Q.<oQ 

 OAO 

 0.20 



4 



14 



16 



18 



20 



6 8 10 12 



Minutes 

 Fig. 6B. — Time-gamma curve of Eastman duplicating negative, Fast, No. 1505. 



Fig. 7. 



1.0 ZO 3.0 



Relative Log Exposure 



-Z)-logio.B curves of Eastman Background X Panchromatic negative No. 1230. 



typical films. In addition to spectrographic information these data include — for 

 each film — Hurter-Driffield curves of density against the logarithm of the 

 exposure and curves showing the variation of gamma with development time. 



