sentences:  Alphonse Beau de Rochas
  
  Alphonse Eugène Beau de Rochas (9 April 1815, Digne-les-Bains, Alpes-de-Haute-Provence – 27 March 1893) was a French engineer who originated the principle of the four-stroke internal-combustion engine.His achievement lay partly in his emphasizing the previously unappreciated importance of compressing the fuel–air mixture before ignition.