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Bank of Weston cells

Bank of Weston cells

C016/2041

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51.3 MB (51.0 MB compressed)

4866 x 3685 pixels

41.1 x 31.2 cm ⏐ 16.2 x 12.3 in (300dpi)

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Credit

NATIONAL PHYSICAL LABORATORY © CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY NATIONAL PHYSICAL LABORATORY © CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY

Caption

Bank of Weston cells. These electrochemical cells produce a stable voltage used as a standard to calibrate voltmeters and define the SI unit for electromotive force (the volt). Also called a standard cell, it were invented in the USA by physicist Edward Weston in 1893. They have cadmium-mercury anodes (top of glass tube), with cathodes of liquid mercury (bottom of tubes) covered by mercury sulphate (white) and mercury. The electrolyte is a clear solution of cadmium sulphate. Weston cells provided the standard for voltage measurements between 1911 and 1990. Photographed at the National Physical Laboratory, Teddington, UK.

Release details

Model release not required. Property release not required.

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