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Hales, Stephen, 1677-1761 (2)
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![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].](https://iiif.wellcomecollection.org/image/L0040397/full/600%2C/0/default.jpg)
![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].](https://iiif.wellcomecollection.org/image/L0040396/full/320%2C/0/default.jpg)