Hand plane and davy lamp: what they have in common

1. Step 1. Hand plane — has part — Chisel. A plane’s blade is a chisel held in a stock.
2. Step 2. Chisel — is used in — Tunnel. Hezekiah’s Tunnel was cut by hand with chisels.
3. Step 3. Tunnel — uses — Mine ventilation. Ventilation.
4. Step 4. Mine ventilation — is used in — Coal mine. Airing the workings.
5. Step 5. Coal mine — uses — Davy lamp. Protection against methane explosions.

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