Vacuum and davy lamp: what they have in common

1. Step 1. Vacuum — is used in — Newcomen engine. Condensing the steam creates a vacuum under the piston.
2. Step 2. Newcomen engine — uses — Coal mine. Pumping water out of mines.
3. Step 3. Coal mine — uses — Davy lamp. Protection against methane explosions.

Open Evothings