Umbrella and particle accelerator: what they have in common

1. Step 1. Umbrella — has part — Spoke. Ribs hold the canopy.
2. Step 2. Spoke — is part of — Penny-farthing. Tension spokes.
3. Step 3. Penny-farthing — is made of — Vulcanized rubber. The tyres are solid rubber.
4. Step 4. Vulcanized rubber — is material for — Van de Graaff generator. The belt is rubber.
5. Step 5. Van de Graaff generator — evolved into — Particle accelerator. Early accelerators.

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