Grenade fuze with pin and newcomen engine: what they have in common

1. Step 1. Grenade fuze with pin — is part of — Grenade. A delay fuse with a pin.
2. Step 2. Grenade — uses — Gunpowder. An explosive.
3. Step 3. Gunpowder — is used in — Cannon. A gunpowder charge.
4. Step 4. Cannon — is part of — Ironclad. Artillery.
5. Step 5. Ironclad — has part — Watt steam engine. Steam engines.
6. Step 6. Watt steam engine — evolved from — Newcomen engine. Watt improved Newcomen’s engine.

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