Gauge needle and dial and submarine: what they have in common

1. Step 1. Gauge needle and dial — is part of — Hygrometer. It shows the humidity.
2. Step 2. Hygrometer — is made of — Plant fibre. Humidity was shown by a fibre that changed length.
3. Step 3. Plant fibre — is material for — Footwear. The oldest sandals (Fort Rock) were woven from sagebrush bark.
4. Step 4. Footwear — is made of — Leather. Leather.
5. Step 5. Leather — is material for — Submarine. It was covered with leather.

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