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

Example of photosensitive (selenium) material c 1890

1880-1900
One of four examples of photosensitive (selenium) material in various stages of construction. Fixed to wooden mount.

Example of photosensitive (selenium) material c 1890

1880-1900
One of four examples of photosensitive (selenium) material in various stages of construction. Fixed to wooden mount.

Example of photosensitive (selenium) material c 1890

1880-1900
One of four examples of photosensitive (selenium) material in various stages of construction. Fixed to wooden mount.

Example of photosensitive (selenium) material c 1890

1880-1900