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  • Ventilators. Engraving by T. Jefferys.
  • Ventilators. Engraving by W. Lowry, 1817.
  • Types of ventilators. Engraving.
  • A treatise on ventilators. Wherein an account is given of the happy effects of many trials that have been made of them ... in refreshing the noxious air of ships, hospitals and mines, to the better preservation of the health and lives of mutitudes ... Part second / [Stephen Hales].
  • A treatise on ventilators. Wherein an account is given of the happy effects of many trials that have been made of them ... in refreshing the noxious air of ships, hospitals and mines, to the better preservation of the health and lives of mutitudes ... Part second / [Stephen Hales].
  • A condenser, an air-gun and a ventilator. Etching by A. Walker after B. Martin.
  • Sanitation: ventilated improved pit latrine
  • Ventilated improved pit latrine construction
  • Pigments: mills for grinding colours, and a man grinding at a muller, with a ventilator hood above. Coloured engraving by J. Pass, 1824.
  • Interior of cutting shop, bad ventilation