Phone line jack and newcomen engine: what they have in common

1. Step 1. Phone line jack — is part of — Modem. Connection to the telephone line.
2. Step 2. Modem — has part — Digital signal processor. Signal processing in high-speed modems.
3. Step 3. Digital signal processor — is a kind of — Microprocessor. A specialized processor.
4. Step 4. Microprocessor — is part of — Insulin pump. A dosing controller.
5. Step 5. Insulin pump — has part — Piston. The reservoir’s plunger.
6. Step 6. Piston — is part of — Newcomen engine. Atmospheric pressure moves the piston.

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