Diesel or diesel fuel (; voiced "s" because of its
eponym) is a specific
fractional distillate of
fuel oil (mostly
petroleum) that is used as
fuel in a
diesel engine invented by German engineer
Rudolf Diesel. The term typically refers to fuel that has been processed from
petroleum, but increasingly, alternatives such as
biodiesel or
biomass to liquid (BTL) or
gas to liquid (GTL) diesel that are not derived from petroleum are being developed and adopted. Although Rudolph Diesel's name has become attached to the compression combustion engine and the fuel that it consumes, he was not first to invent the diesel engine. His patent was filed in 1893. However
Herbert Akroyd Stuart, built the first compression-ignition oil engine in Bletchley, England, in 1891. He leased the rights to Richard Hornsby & Sons in July 1892, five years before Diesel's prototype was built.
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