Measurement scale and oil lamp: what they have in common

1. Step 1. Measurement scale — is part of — Thermometer. Degrees.
2. Step 2. Thermometer — is part of — Weather station. A thermometer.
3. Step 3. Weather station — has part — Hygrometer. A hygrometer.
4. Step 4. Hygrometer — is made of — Plant fibre. Humidity was shown by a fibre that changed length.
5. Step 5. Plant fibre — is material for — Wick. A wick is twisted from plant fibres.
6. Step 6. Wick — is part of — Oil lamp. The wick feeds oil to the flame.

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