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10198873
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John Theophilus Desaguliers, French-born scientist and inventor, 1725.

Engraving by P Pelham after an original painting by H Hysing. Desaguliers (1683-1744), a French-born British inventor and scientist, became experimental assistant to Sir Isaac Newton. He designed a project to heat salt-boilers and similar vessels by steam rather than fire. He added a safety valve to Thomas Savery's steam engine, which along with an internal water jet, condensed the steam in the displacement chambers, improving the design. He appears here holding a magnifying glass, with a glass prism on the table.

Image No. 10198873 | This is a Rights Managed image.

Inventory No.: 1903-0167
Credit © Science Museum / Science & Society Picture Library -- All rights reserved.
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