Electric arc furnace and piston pump: what they have in common

1. Step 1. Electric arc furnace — has part — Graphite. Graphite electrodes.
2. Step 2. Graphite — is material for — Mechanical pencil. The lead is graphite.
3. Step 3. Mechanical pencil — is made of — Silver. Early mechanical pencils were silver.
4. Step 4. Silver — is material for — Syringe. Early needles were silver.
5. Step 5. Syringe — works like — Piston pump. A syringe is a hand-operated piston pump.

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