Amplitude and frequency modulation and paper machine: what they have in common

1. Step 1. Amplitude and frequency modulation — is used in — Modem. It encodes bits by modulation.
2. Step 2. Modem — uses — Telephone. It works over a telephone line.
3. Step 3. Telephone — has part — Loudspeaker. The earpiece reproduces the other person’s voice.
4. Step 4. Loudspeaker — is made of — Paper. The cone is paper.
5. Step 5. Paper — uses — Paper machine. Industrial production.

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