Handlebar and shaduf: what they have in common

1. Step 1. Handlebar — is part of — Drais’s running machine. A handlebar for steering the front wheel already appeared on Drais’s machine.
2. Step 2. Drais’s running machine — has part — Wheel. Two wheels in line.
3. Step 3. Wheel — is used in — Windlass. A windlass is a wheel and axle used as a simple machine.
4. Step 4. Windlass — is used in — Well. The bucket was raised with a windlass.
5. Step 5. Well — uses — Shaduf. Or with a well sweep.

Open Evothings