Reservoir and pneumatic tube: what they have in common

1. Step 1. Reservoir — is part of — Cistern. A container for water.
2. Step 2. Cistern — is made of — Lime. The walls were coated with lime plaster against leaks.
3. Step 3. Lime — includes — Chalk. Chalk is calcium carbonate, like limestone.
4. Step 4. Chalk — is material for — Tablet (medicine). Tablet fillers are chalk and starch.
5. Step 5. Tablet (medicine) — works like — Capsule. Dosage forms.
6. Step 6. Capsule — is part of — Pneumatic tube. A container for letters.

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