Hurter and Driffield Actinograph. Small mahogany box containing exposure calculator
Hurter and Driffield Actinograph. Small mahogany box containing exposure calculator, slide rule type. Scales for plate speed: 0.5-300 H&D. Exposure time: 0.05-60secs. Aperture: f/2.8-65 52 degrees 30' 0".
- Materials:
- brass (copper, zinc alloy) and mahogany (wood)
- Object Number:
- 1990-5036/2624/1
- type:
- actinograph