From left to right, chemists and physicists: Kirchhoff, von Bunsen and Roscoe c1860. Gustave Robert Kirchhoff, German physicist (1824-1887), Robert Wilhelm Eberhard von Bunsen, German Physicist and chemist (1811-1899) and Sir Henry Enfield Roscoe, English Chemist, (1833-1915). From History of Chemistry, by Edward Thorpe. (London, 1910).
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