Reactive armour and hammer: what they have in common

1. Step 1. Reactive armour — is part of — Tank. Modern tanks.
2. Step 2. Tank — has part — Gas turbine. Some tanks (T-80, Abrams) have a gas turbine engine.
3. Step 3. Gas turbine — has part — Turbine. A turbine.
4. Step 4. Turbine — evolved from — Water wheel. The water turbine evolved from the water wheel.
5. Step 5. Water wheel — is part of — Trip hammer. The shaft was turned by a water wheel.
6. Step 6. Trip hammer — evolved from — Hammer. A trip hammer is a hammer lifted and dropped by a water wheel.

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