Humphrey Gainsborough was pastor to the Independent Church in Henley-on-Thames, England. He was the brother of the artist Thomas Gainsborough. He invented the drill plough (1766), winning a prize of £60 from the Royal Society for his efforts. He also invented the tide mill (1761), which allowed a mill wheel to rotate in either direction, winning a £50 prize from the Society for the Encouragement of Arts in London. In addition, he designed a self-ventilating fish wagon (1762).
Gainsborough designed Conway's Bridge, built in 1763 at Park Place close to Henley, an interesting rustic arched stone structure that still carries traffic on the road between Wargrave and Henley today. In 1768, he improved the slope on the road up the steep White Hill to the east of Henley, straightening it in the process.
In the 1760s, Gainsborough showed a model of a condensing steam engine to James Watt. Watt had been working independently on improvements to the Newcomen "atmospheric engine" and subsequently patented these in 1769. He perhaps included some of — and at least built on — Gainsborough's ideas. Gainsborough is thus probably less well-known than he might have been.
A blue plaque in Gainsborough's honour can be found in the town of Henley itself on the gates of the Manse, the house where he lived next to the Christ Church United Reform Church. Inside he designed an early security chain and plate on one of the outside doors, allowing the door to be partially opened, that is still there now. Similar designs are used on many people's front doors today.
… one of the most ingenious men that ever lived, and one of the best that ever died … Perhaps of all the mechanical geniuses this or any nation has produced. Mr Gainsborough was the first.
- Tyler, David (2006). "Humphrey Gainsborough, 1718–1776: Cleric, Engineer and Inventor". Transactions of the Newcomen Society (76): 51–81.,
read to the Newcomen Society at the Science Museum, 12 October 2005.
- Humphrey Gainsborough (1718–1776), Oxfordshire Blue Plaques Scheme, UK.
- Thicknesse, Philip, The Gentleman's Magazine, 1785.
- Boston, Philippa, Opening Pandora's box, Oxfordshire Limited Edition.
- Kendal, Roger, Bowen, Jane and Wortley, Laura, Genius & Gentility: Henley in the Age of Enlightenment. River and Rowing Museum, 2002. See The Reverend Humphrey Gainsborough, pages 20–31.
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