Johann Gahn, Swedish chemist and mineralogist, c 1780.

 
Johann Gahn, Swedish chemist and mineralogist, c 1780.
4 0 c m
 
33cm
actual image size: 25cm x 32cm

Description

Johann Gahn (1745-1818) started his career as a miner before studying mineralogy and developing a way of preparing metallic manganese on a large scale. With Carl Wilhelm Scheele, Gahn discovered the presence of phosphoric acid in the bones. Gahnite, a mineral, is named after him.

Image Details

Image Ref.
 
10301635

© Science Museum / Science & Society Picture Library

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