Wooden post and watt steam engine: what they have in common

1. Step 1. Wooden post — is part of — Shaduf. The post is the fulcrum of the lever.
2. Step 2. Shaduf — is used in — Well. Or with a well sweep.
3. Step 3. Well — uses — Windlass. The bucket was raised with a windlass.
4. Step 4. Windlass — uses — Crank. The handle of a windlass is a crank.
5. Step 5. Crank — is part of — Watt steam engine. The stroke of the piston becomes rotation of a shaft (Watt first used a planetary gear).

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