Waterproof plaster lining and electrical telegraph: what they have in common

1. Step 1. Waterproof plaster lining — is part of — Cistern. Plaster on hydraulic mortar.
2. Step 2. Cistern — has part — Reservoir. A container for water.
3. Step 3. Reservoir — is part of — Thermometer. A bulb with liquid.
4. Step 4. Thermometer — is part of — Weather station. A thermometer.
5. Step 5. Weather station — is used in — Weather forecast. Observations.
6. Step 6. Weather forecast — uses — Electrical telegraph. Collecting reports by telegraph.

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