Gold leaf foils and electrical telegraph: what they have in common

1. Step 1. Gold leaf foils — is part of — Electroscope. They spread apart when charged.
2. Step 2. Electroscope — uses — Static electricity. The leaves repel each other.
3. Step 3. Static electricity — is used in — Van de Graaff generator. Charge is carried by a belt.
4. Step 4. Van de Graaff generator — evolved into — Particle accelerator. Early accelerators.
5. Step 5. Particle accelerator — uses — Electromagnet. Bending magnets.
6. Step 6. Electromagnet — is part of — Electrical telegraph. Morse’s receiver.

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