Separator bowl drum and davy lamp: what they have in common

1. Step 1. Separator bowl drum — is part of — Cream separator. A fast-spinning drum with discs.
2. Step 2. Cream separator — uses — Centrifugal effect. Separation by density.
3. Step 3. Centrifugal effect — is used in — Sling. The projectile is whirled around.
4. Step 4. Sling — is made of — Plant fibre. A sling was woven from fibres or wool.
5. Step 5. Plant fibre — is material for — Wick. A wick is twisted from plant fibres.
6. Step 6. Wick — is part of — Davy lamp. A wick.

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