3 actinometers from Primus printing gauge
A set of 3 actinometers from Primus printing gauge for printing platinotype, carbon, ozotype papers etc. Plated holder for strip of POP paper with 12-step wedge.
- Materials:
- metal (unknown) , steel (metal) , felt and glass
- Object Number:
- 1990-5036/2/1
- type:
- exposure meter and actinometer