Greenhouse effect and piston pump: what they have in common

1. Step 1. Greenhouse effect — is used in — Solar water heater. A collector under glass.
2. Step 2. Solar water heater — uses — Heat transfer. Heating the water.
3. Step 3. Heat transfer — is used in — Davy lamp. The gauze draws off heat and stops the flame.
4. Step 4. Davy lamp — is used in — Coal mine. Protection against methane explosions.
5. Step 5. Coal mine — is used in — Newcomen engine. Pumping water out of mines.
6. Step 6. Newcomen engine — has part — Piston pump. The beam drove a mine pump.

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