Triode and shaduf: what they have in common

1. Step 1. Triode — is made of — Tungsten. The filament is tungsten.
2. Step 2. Tungsten — is material for — High-speed steel. Tungsten.
3. Step 3. High-speed steel — is used in — Lathe. Cutting tools.
4. Step 4. Lathe — has part — Rope. The bowstring wraps around the workpiece and turns it.
5. Step 5. Rope — is used in — Well. Water was raised with a bucket on a rope.
6. Step 6. Well — uses — Shaduf. Or with a well sweep.

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