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Was the internal combustion engine apart of a 19th century invention?

Yes, the internal combustion engine was part of a 19th-century invention. The first internal combustion engine was invented in 1807 by French inventor Nicéphore Niépce. Niépce's engine used a mixture of air and coal dust as fuel and was able to produce a power output of about 1 horsepower. In 1824, English inventor Samuel Brown invented the first internal combustion engine that used liquid fuel. Brown's engine used a mixture of turpentine and alcohol as fuel and was able to produce a power output of about 2 horsepower. In 1859, Belgian inventor Étienne Lenoir invented the first internal combustion engine that was used in a commercial application. Lenoir's engine was used to power a boat and was able to produce a power output of about 2 horsepower. In 1860, German inventor Nikolaus Otto invented the first internal combustion engine that used a four-stroke cycle. Otto's engine was able to produce a power output of about 3 horsepower and was much more efficient than previous internal combustion engines.