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

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Image Number:  1895-38426Rights ManagedCredit Line:NMPFT/SSPL/Science and Society/SuperStockCollection:Science and SocietyContributor:NMPFT/SSPLModel Release:NoProperty Release:NoResolution:2525×3598
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