An engraving depicting Stephen Hales' ventilators - Top: a ship's ventilator as used by the British Navy - complete and sectional views. Centre: a ventilator used in old Newgate Jail. Bottom: a windmill which powered the Negate ventilator. Stephen Hales (1677-1761) an English clergyman who made significant contributions to a range of scientific fields including botany, atmospheric chemistry and physiology. Dated 18th century.

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TOP25358517

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達志影像

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RM

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須由TPG 完整授權

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