Spray bottle and windlass: what they have in common

1. Step 1. Spray bottle — has part — Piston pump. A hand pump.
2. Step 2. Piston pump — evolved into — Watt steam engine. The first steam engines (Newcomen’s) pumped water out of mines by driving pumps.
3. Step 3. Watt steam engine — has part — Crank. The stroke of the piston becomes rotation of a shaft (Watt first used a planetary gear).
4. Step 4. Crank — is used in — Windlass. The handle of a windlass is a crank.

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