IV drip and davy lamp: what they have in common

1. Step 1. IV drip — has part — Syringe. A needle.
2. Step 2. Syringe — has part — Piston. A plunger.
3. Step 3. Piston — is part of — Newcomen engine. Atmospheric pressure moves the piston.
4. Step 4. Newcomen engine — uses — Coal mine. Pumping water out of mines.
5. Step 5. Coal mine — uses — Davy lamp. Protection against methane explosions.

Open Evothings