Backstrap loom and voltaic pile: what they have in common

1. Step 1. Backstrap loom — uses — Plant fibre. Cloth is woven from threads spun from fibres.
2. Step 2. Plant fibre — is material for — Footwear. The oldest sandals (Fort Rock) were woven from sagebrush bark.
3. Step 3. Footwear — is made of — Leather. Leather.
4. Step 4. Leather — is material for — Submarine. It was covered with leather.
5. Step 5. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.
6. Step 6. Lead–acid battery — evolved from — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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