Book type actinometer, with a sliding strip of sensitive paper, slide rule calculator with scales for actinometer times 1/5-100, H & D speeds 5-600, apertures f/4.5-64 US 1-256, and exposure times 1/500-60 secs.Imperial Dry plate Company
- Photographic Technology
- Object Number:
- exposure meter
- The Kodak Collection at the National Media Museum, Bradford
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