Ion detector and sewage treatment plant: what they have in common

1. Step 1. Ion detector — is part of — Mass spectrometer. It counts the ions.
2. Step 2. Mass spectrometer — has part — Vacuum pump. A vacuum system.
3. Step 3. Vacuum pump — evolved from — Piston pump. Guericke adapted the piston pump to pump out air.
4. Step 4. Piston pump — is part of — Concrete pump. A piston pump.
5. Step 5. Concrete pump — uses — Concrete. It pumps concrete.
6. Step 6. Concrete — is material for — Sewage treatment plant. The tanks are concrete.

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