Harp and tank: what they have in common

1. Step 1. Harp — evolved into — Guitar. Plucked instruments.
2. Step 2. Guitar — evolved into — Electric guitar. Electrification.
3. Step 3. Electric guitar — has part — Potentiometer. The volume and tone knobs on an electric guitar are potentiometers.
4. Step 4. Potentiometer — is made of — Nickel. The resistance wire is a nickel alloy.
5. Step 5. Nickel — is material for — Gas turbine. The blades are nickel superalloys.
6. Step 6. Gas turbine — is part of — Tank. Some tanks (T-80, Abrams) have a gas turbine engine.

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