Mortar baseplate and gas lamp: what they have in common

1. Step 1. Mortar baseplate — is part of — Mortar (weapon). It transfers the recoil to the ground.
2. Step 2. Mortar (weapon) — uses — Gunpowder. A propellant charge launches the bomb.
3. Step 3. Gunpowder — evolved into — Dynamite. A replacement for gunpowder in mining.
4. Step 4. Dynamite — is used in — Tunnel. Drilling and blasting.
5. Step 5. Tunnel — has part — Street light. Lighting.
6. Step 6. Street light — evolved from — Gas lamp. Gas lamps.

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