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Thomas Graham, Scottish chemist, c 1870

IMAGE number
UIS5071233
Image title
Thomas Graham, Scottish chemist, c 1870
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Location
Science Museum, London, UK
Medium
photography
Image description

Thomas Graham, Scottish chemist, c 1870. Carte de visite photograph by Samuel A Walker & Co. Thomas Graham (1805-1869) showed that hydrogen readily penetrated heated iron, platinum and especially palladium. Palladium absorbs about 650 times its volume of hydrogen which Graham called 'occlusion'. He supposed that hydrogen gas was the vapour of a very volatile metal hydrogenium which formed an alloy with palladium. He had a medal struck from this supposed alloy, an example was presented to Sir John Herschel whom Graham had succeeded as Master of the Mint. Graham was also professor of chemistry at University College, London. ©SSPL/Science Museum

Photo credit
SSPL/UIG / Bridgeman Images
Image keywords
19th century / chemist / chemistry / science / scientist / portrait / photography / man / portrait / scotland scotish / great britain - british / Science / scientist / chemistry

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Largest available format 2163 × 3504 px 1 MB
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