1-216-715 - The Print Collector/Heritage Images

Joseph Black, Scottish physicist and chemist, (1870). Black (1728-1799) was the first to isolate carbon dioxide in a pure state. His work also helped discredit the theory of the theory of phlogiston. He is most famous for devising the theory of latent heat and demonstrating that different substances have different specific heats. An engraving from Robert Chambers' A Biographical Dictionary of Eminent Scotsmen, Blackie and Son, (Glasgow, Edinburgh, and London, 1870).