Compass and electric generator: what they have in common

1. Step 1. Compass — works like — Hall sensor. Both sense the Earth’s magnetic field.
2. Step 2. Hall sensor — is part of — Anti-lock braking system (ABS). Sensors measure the wheel speed.
3. Step 3. Anti-lock braking system (ABS) — evolved from — Air brake. Anti-skid systems first appeared in aviation and on railways.
4. Step 4. Air brake — is part of — Diesel locomotive. Air brakes.
5. Step 5. Diesel locomotive — has part — Electric generator. The generator powers the traction motors.

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