Static electricity and bellows: what they have in common

1. Step 1. Static electricity — is used in — Xerography. Toner sticks to a charged drum.
2. Step 2. Xerography — is used in — Laser printer. The principle of xerography.
3. Step 3. Laser printer — is made of — Carbon. Toner is carbon black in resin.
4. Step 4. Carbon — is material for — Coke. Coke is almost pure carbon: everything else is baked out of the coal.
5. Step 5. Coke — is used in — Blast furnace. The fuel and reducing agent is coke (formerly charcoal).
6. Step 6. Blast furnace — has part — Bellows. Air was blown in by bellows, later by blowers.

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