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Four selenium low power rectifiers

1942-1946

Photoectric cell c. 1915 (probably by GEC)

1910-1920

Glass-stoppered bottle containing selenium

1801-1892 (prepared)

Cascade generator for 1.5 million volt accelerator

1937

"Lightometer" light meter model E703

1950-1960

Printing Cylinder from a Xerox Machine, 1978

1978

EEL Lightmaster Photometer serial no. 18-3486 (a light meter)

1960-1969 (estimated)

Bust of Berzelius in selenium, 1862

1862
Two selenium high voltage rectifiers: 1945 British 16 H.T.80; 1948 British 36 H.T.40

Two selenium high voltage rectifiers

1945-1948
Model 603 illumination meter, no. A.40195 by Weston Electrical Instrument Co., Surbiton, England, c. 1933.

Model 603 illumination meter by Weston Electrical Instrument Co.

1928-1938
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
'Wound Mica Coated With a Film of Selenium'. One of four examples of photosensitive (selenium) material in various stages of construction. Fixed to wooden mount. Part of apparatus for transmitting pictures by telegraph (phototelegraphy). Designed and constructed by Dr Shelford Bidwell in 1881.

Wound Mica Coated With a Film of Selenium

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