thumb|300px|1806 diagram of the Pyréolophore, drawn by the Niépce brothers
thumb|300px|1806 diagram of the Pyréolophore, drawn by the Niépce brothers
The Pyréolophore () was an early internal combustion engine and the first made to power a boat. It was invented in the early 19th century in Chalon-sur-Saône, France, by the Niépce brothers: Nicéphore (who went on to invent photography) and Claude. In 1807 the brothers ran a prototype internal combustion engine, and on 20 July 1807 a patent was granted by Napoleon Bonaparte after it had successfully powered a boat upstream on the river Saône.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).