Joseph Black (1728-99) Scottish chemist, taking a walk. Theory of 'latent heat': pneumatic chemistry. Black in 1787. Etching by John Kay.

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Keywords: 1728-99, 1787., archival, archive, black, british, chemist, chemistry., etching, heat:, historical, history, john, joseph, kay., latent, pneumatic, scientist, scottish, theory, walk, walk.