Before revision: 300px|1806 diagram of the Pyréolophore, of 1806 drawn by the Niépce brothers The Pyréolophore () was one of the world's first internal combustion engines .
After revision: 300px|1806 diagram of the Pyréolophore, of 1806 drawn by the Niépce brothers The Pyréolophore () was probably the world's first internal combustion engine .