Exposure Adjuster for Chronex NDT X-Ray Film (ca. 1970s)

This slide rule was manufactured by DuPont for use with their Cronex NDT industrial radiography film. It simplified quantitative adjustments to film density (darkness) that would either involve changing the duration of the exposure or the source to film distance.

Size: 2" x 6"

 

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Last updated: 12/16/11
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