The Capitaine was one of the first petroleum engines in Europe, and the first four-stroke types were made in France around 1889. The engine picture shown has a form of hot-bulb which was unique to Capitaine for a while. The unusual connnecting rod arrangement was probably dropped in later engines as unneccessary complication. This arrangement was also used by Bolnes, the Dutch engine builder.
If the engine looks a little drunk around the flywheel area, it was the fault of the original printed page, but I will try to get a better scan from the (1909) book.
More information to be posted when available