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80.2 MB (80.0 MB compressed)
6113 x 4585 pixels
51.8 x 38.9 cm ⏐ 20.4 x 15.3 in (300dpi)
ROYAL INSTITUTION OF GREAT BRITAIN / SCIENCE PHOTO LIBRARY ROYAL INSTITUTION OF GREAT BRITAIN / SCIENCE PHOTO LIBRARY
Discovery of potassium. The apparatus used by Sir Humphrey Davy in 1807 to isolate potassium metal from 'caustic potash', or potassium hydroxide. This was obtained by electrolysis, passing the current from a large voltaic pile through the molten hydroxide. Potassium was the first metal isolated by electrolysis. This object is on display at the Royal Institution, London.
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