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:
- 1908-141/13
- Materials:
- selenium, wood (unidentified) and brass (copper, zinc alloy)
- Measurements:
-
selenium cell: 70 mm x 45 mm x 20 mm,
- credit:
- Bidwell, Shelford
