BBS und rolling mill: was sie gemeinsam haben
- Schritt 1. BBS — nutzt — Modem. Access by modem.
- Schritt 2. Modem — nutzt — Telephone. It works over a telephone line.
- Schritt 3. Telephone — entwickelte sich aus — Electrical telegraph. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).
- Schritt 4. Electrical telegraph — wird verwendet in — Time zones. Synchronizing time by telegraph.
- Schritt 5. Time zones — wurde inspiriert von — Railway track. Introduced because of railway timetables.
- Schritt 6. Railway track — nutzt — Rolling mill. Rails are rolled.