Spark gap brass balls and internal combustion engine: 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 — uses — Friction. Friction.
3. Step 3. Friction — is used in — Clutch. Friction discs transmit torque through friction.
4. Step 4. Clutch — is part of — Motorcycle. A clutch between the engine and the gearbox.
5. Step 5. Motorcycle — has part — Internal combustion engine. A motorcycle is driven by a combustion engine.

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