In 1880 Joseph Ravel, a French engineer and inventor, built and patented this acetylene-powered two-stroke engine. Patent 236,258. The design seems to be ahead of its time but was apparently abandoned after a series of accidents culminated in a huge explosion.
Acetylene was discovered in 1836 but had been rediscovered in France in 1860 by chemist Marcellin Berthelot.

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