Subwoofer and railway track: what they have in common

1. Step 1. Subwoofer — has part — Permanent magnet. A magnet system moves the cone.
2. Step 2. Permanent magnet — is part of — Pickup. A magnet magnetizes the string.
3. Step 3. Pickup — has part — Copper wire. A winding.
4. Step 4. Copper wire — is part of — Electrical telegraph. Communication lines.
5. Step 5. Electrical telegraph — is used in — Time zones. Synchronizing time by telegraph.
6. Step 6. Time zones — was inspired by — Railway track. Introduced because of railway timetables.

Open Evothings