Magnetic lodestone spoon and paper machine: what they have in common

1. Step 1. Magnetic lodestone spoon — is part of — South-pointing spoon (Chinese compass). A lodestone spoon that turns its handle to the south.
2. Step 2. South-pointing spoon (Chinese compass) — evolved into — Compass. A magnetic pointer.
3. Step 3. Compass — uses — Magnetism. The needle aligns with the Earth’s magnetic field.
4. Step 4. Magnetism — is used in — Magnetic tape. Recording by magnetization.
5. Step 5. Magnetic tape — is made of — Paper. Pfleumer’s first tape was paper coated with magnetic powder.
6. Step 6. Paper — uses — Paper machine. Industrial production.

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