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http://en.wikipedia.org/wiki/Four-stroke_cycleThe Otto cycle engine was first patented by Eric B. Davidson and Felice Matteucci in 1854 followed by a first prototype in 1860. It was also conceptualized by French engineer, Alphonse Beau de Rochas in 1862 and independently, by the German engineer Nicolaus Otto in 1876[citation needed]. Its power cycle consists of adiabatic compression, heat addition at constant volume, adiabatic expansion and rejection of heat at constant volume and characterized by four strokes, or reciprocating movements of a piston in a cylinder: