Felt and dewar flask: what they have in common

1. Step 1. Felt — is material for — Hat. Felt.
2. Step 2. Hat — has part — Hat band ribbon. A band at the base of the crown.
3. Step 3. Hat band ribbon — is part of — Van de Graaff generator. It carries charge upwards.
4. Step 4. Van de Graaff generator — evolved into — Particle accelerator. Early accelerators.
5. Step 5. Particle accelerator — uses — Vacuum. A vacuum chamber.
6. Step 6. Vacuum — is used in — Dewar flask. A vacuum.

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