Penny-farthing and particle accelerator: what they have in common

1. Step 1. Penny-farthing — is made of — Vulcanized rubber. The tyres are solid rubber.
2. Step 2. Vulcanized rubber — is material for — Van de Graaff generator. The belt is rubber.
3. Step 3. Van de Graaff generator — evolved into — Particle accelerator. Early accelerators.

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