sentences:  Photographs show a Dutheil Chalmers motor fitted to Watson's first rocking wing aircraft, but Gibbs-Smith later presented these to M. Charles Dolfuss, Director of the Musee de L'Air at Le Bourget, Paris who confirmed it as a 1908 or 1909 four cylinder 40 hp Dutheil Chalmers motor.If Watson acquired the Dutheil Chalmers engine from Santos-Dumont, the earliest date the purchase could have taken place was 1908.A further false statement made by James Watson was that Preston had the No.