Trap (siphon) and CNC machine: what they have in common

1. Step 1. Trap (siphon) — is part of — Flush toilet. A trap.
2. Step 2. Flush toilet — has part — Valve. The cistern’s float valve.
3. Step 3. Valve — is part of — Bellows. A valve in the bellows lets air in when they open and keeps it from escaping back.
4. Step 4. Bellows — is part of — Player piano. Pedal bellows create suction.
5. Step 5. Player piano — uses — Program control of a machine. The tune is recorded on a perforated roll.
6. Step 6. Program control of a machine — is used in — CNC machine. The tool’s movement is set by a program — at first on punched tape.

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