P–n junction and rope: what they have in common

1. Step 1. P–n junction — is used in — Diode. A semiconductor diode is a p–n junction.
2. Step 2. Diode — evolved into — Triode. De Forest added a grid.
3. Step 3. Triode — is made of — Tungsten. The filament is tungsten.
4. Step 4. Tungsten — is material for — High-speed steel. Tungsten.
5. Step 5. High-speed steel — is used in — Lathe. Cutting tools.
6. Step 6. Lathe — has part — Rope. The bowstring wraps around the workpiece and turns it.

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