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Into the air thus compressed is then gradually

introduced from the exterior finely divided fuel,

which ignites on introduction, since the air is at a

temperature far above the igniting-point of the

fuel. The characteristic features of the cycle

according to my present invention are therefore,

increase of pressure and temperature up to the

maximum, not by combustion, but prior to

combustion by mechanical compression of air,

and there upon the subsequent performance of

work without increase of pressure and

temperature by gradual combustion during a

prescribed part of the stroke determined by the

cut-oil".[14]