Spark gap brass balls and incandescent light bulb: what they have in common

1. Step 1. Spark gap brass balls — is part of — Electrostatic machine. Spheres for the spark.
2. Step 2. Electrostatic machine — evolved into — Van de Graaff generator. A belt generator.
3. Step 3. Van de Graaff generator — evolved into — Particle accelerator. Early accelerators.
4. Step 4. Particle accelerator — uses — Vacuum. A vacuum chamber.
5. Step 5. Vacuum — is used in — Incandescent light bulb. The bulb was evacuated so the filament would not burn out.

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