Large lead balls and oil lamp: what they have in common

1. Step 1. Large lead balls — is part of — Torsion balance. The attracting masses.
2. Step 2. Torsion balance — is used in — Universal gravitation. The Cavendish experiment — weighing the Earth.
3. Step 3. Universal gravitation — is used in — Warp-weighted loom. The warp threads are tensioned by weights.
4. Step 4. Warp-weighted loom — is made of — Clay. The warp threads were tensioned with clay weights.
5. Step 5. Clay — is material for — Oil lamp. Later — clay ones.

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