Reaction wheel and newcomen engine: what they have in common

1. Step 1. Reaction wheel — is a kind of — Flywheel. A flywheel.
2. Step 2. Flywheel — is part of — Watt steam engine. The flywheel evens out rotation.
3. Step 3. Watt steam engine — evolved from — Newcomen engine. Watt improved Newcomen’s engine.

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