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SENS1TOMETRY 117
producing talking motion pictures makes practical use of the Hurter and Driffield system.
The foregoing gives a short historical resume of the rapid growth of interest in the application of sensitomctry. It must not be construed however, that it has been only since 1928 that thought was given to practical sensitometric applications. Photographic literature is full of articles dealing with this subject and the above statement applies only to the applications of sensitometry to motion picture production problems. An endeavor will now be made to be more specific and outline how sensitometry is applied in actual picture production.
24
Panchromatic Negative
0.4 0.8 12 1.6 2.0 24 2.8 3.2 3.6 LOQ EXPOSURE
Fig. 4
Development of Picture Negative
The procedure followed in the determination of the extent of development of a picture negative involves a sensitometric exposure on the same emulsion used for the picture. There are several means of accomplishing this exposure. Many of the laboratories make their sensitometric strips using a light testing machine, such as are commercially obtainable. Others use a sensitometer as supplied by one of the large sound equipment companies, while others use sensitometric strips which have been exposed in a time-scale sensitometer. These exposed strips are then attached to the rolls of film to be developed, so that they receive the same development that the picture receives. At the completion of the development process the sen