Example of photosensitive (selenium) material c 1890

One of four examples of photosensitive (selenium) material in various stages of construction. Fixed to wooden mount.

Details

Category:
Telecommunications
Object Number:
1908-141 Pt2
Materials:
selenium, wood (unidentified) and brass (copper, zinc alloy)
Measurements:
selenium cell: 20 mm x 100 mm x 6 mm, 0.05kg
type:
photosensitive material sample
credit:
Bidwell, Shelford