Penrose carbon actinometer

Made:
London
maker:
A.W. Penrose and Co.

Penrose Carbon Actinometer; step wedge numbered 1-10; provision for roll of paper.

Details

Category:
Photographic Technology
Object Number:
1990-5036/7616
Materials:
felt, glass, metal (unknown) and wood (unidentified)
type:
actinometer
credit:
The Kodak Collection at the National Media Museum, Bradford