18th century diving bells by Dr Edmond Halley 18, Martin Triewald 19, Charles Spalding 20 and Karl Heinrich Klingert's diving suit 21-27. Copperplate engraving by Wilson Lowry after a drawing by John Farey from Abraham Rees' Cyclopedia or Universal Dictionary of Arts, Sciences and Literature, Longman, Hurst, Rees, Orme and Brown, London, 1816.

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