Arch bridge and internal combustion engine: what they have in common

1. Step 1. Arch bridge — is made of — Stone. Arch bridges are built of dressed stone.
2. Step 2. Stone — is material for — Potter’s wheel. Early potter’s wheels were stone discs on an axle.
3. Step 3. Potter’s wheel — has part — Flywheel. A lower flywheel turned by the foot.
4. Step 4. Flywheel — is part of — Internal combustion engine. The flywheel smooths out the engine’s strokes.

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