Glowing gas discharge tube and davy lamp: what they have in common

1. Step 1. Glowing gas discharge tube — is part of — Neon sign. A bent glass tube with neon.
2. Step 2. Neon sign — has part — Transformer. A high-voltage transformer.
3. Step 3. Transformer — is part of — Hi-fi amplifier. The power supply is a transformer.
4. Step 4. Hi-fi amplifier — has part — Heat sink. Radiators carry away heat.
5. Step 5. Heat sink — uses — Heat transfer. Heat dissipation.
6. Step 6. Heat transfer — is used in — Davy lamp. The gauze draws off heat and stops the flame.

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