Patent Drawing of Engine - Rivaz Engine - . Public domain image

Uploaded from Eckermann, Erik (2001). World history of the automobile. SAE. pp. 18 - 19. ISBN 076800800X. yLZeQwqNmdgC&pg=PA18&dq=fran%C3%A7ois+isaac+de+rivaz+engine&hl=en&ei=jVG9TdG2Hsy38gPv1eC2BQ&sa=X&oi=book_result&ct=result&resnum=5&ved=0CD4Q6AEwBA#v=onepage&q&f=false. This is a reproduction from the 1804 patent. Annotation my own.
The first use of an internal combustion engine to power a car. The first use of spark ignition in an internal combustion engine. The first use of hydrogen as a fuel in an engine.