Flywheel and davy lamp: what they have in common

1. Step 1. Flywheel — is part of — Watt steam engine. The flywheel evens out rotation.
2. Step 2. Watt steam engine — is part of — Mine hoist. Steam winding engines.
3. Step 3. Mine hoist — is part of — Coal mine. Hoisting.
4. Step 4. Coal mine — uses — Davy lamp. Protection against methane explosions.

Open Evothings