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Haven't created a thread in about 12 months so let's make it a good one:
The basic effects and physics of heating water, expansion and creating steam were known in Roman Greece c. 1st Century AD but never developed into useful applications until the 1600s at the earliest.
AHC: Bring the utilisation of steam power 'significantly' forward.
WI: What are the effects of an ATL with useful steam power for industry before 1000?