Ploughshare and gas lamp: what they have in common

1. Step 1. Ploughshare — is part of — Plough. It undercuts the slice of earth.
2. Step 2. Plough — has part — Handle. Handles for steering the plough.
3. Step 3. Handle — is part of — Chisel. A wooden or plastic handle.
4. Step 4. Chisel — is used in — Tunnel. Hezekiah’s Tunnel was cut by hand with chisels.
5. Step 5. Tunnel — has part — Street light. Lighting.
6. Step 6. Street light — evolved from — Gas lamp. Gas lamps.

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