Oil had been discovered in coal mines as a source of combustible fluid and hence power. It could be burnt to heat water and so make steam. It could also be made to combust in an enclosed cylinder, driving a piston.
The bicycle had sewn the seed, and, particularly, the French began to explore adding power, from internal combustion, to bicycles. Once the famous Red Flag had ceased to control speed on British roads, engineers and entrepreneurs began to build an industry that would dwarf textiles, iron and steel and coal.
Why stay on the ground? Thinking, that had been around since the time of the Great Exhibition, could be given its wings, and man flew. Ships were powered by diesel.
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