Hurter & Driffield Actinograph Exposure Calculator, 1888

 
Hurter & Driffield Actinograph Exposure Calculator, 1888
4 0 c m
 
31cm
actual image size: 23cm x 32cm

Description

The Hurter & Driffield Actinograph, which was sold from 1888 onwards, was one of the most efficient early devices for calculating exposure.

© NMeM / Kodak Collection / Science & Society

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