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Four selenium low power rectifiers

1942-1946

Glass-stoppered bottle containing selenium

1801-1892 (prepared)

Photoectric cell c. 1915 (probably by GEC)

1910-1920

Printing Cylinder from a Xerox Machine, 1978

1978

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

1960-1969 (estimated)

"Lightometer" light meter model E703

1950-1960

Bust of Berzelius in selenium, 1862

1862

Cascade generator for 1.5 million volt accelerator

1937

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

Selenium medal commemorating Jacob Berzelius, unsigned, France, 1826. Obverse, head and shoulders with jacket, left-facing in profile representation of Jacobus Berzelius. Reverse, inscription. This medal is almost an exact copy of 1973-416/15: the difference being that this medal is smaller, unsigned and made in France.

Selenium medal commemorating Jacob Berzelius, France, 1826

1826

Selenium medal commemorating Jacob Berzelius, by H. Kirchner and Batka, Czechoslovakia, 1826. Obverse, head and shoulders, left-facing in profile representation of Jacobus Berzelius. Reverse, inscription. This medal is almost an exact copy of 1973-416/77: the difference being that this medal is larger, signed and made in Czechoslovakia.

Selenium medal commemorating Jacob Berzelius, 1826

1826

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

'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