An engine from 1806, called the “Pyréolophore”. It was tested in Chalon-sur-Saone.

-It is brought up here because Cayley, an aviation pioneer, influenced by Henson's project and by the possibility of powering airships by propeller or flap wings, considered the application of this rare explosion engine that used lycopode powder. ”.

“Niepce's Pyréolophore engine”