Vacuum sealer and electrical telegraph: what they have in common

1. Step 1. Vacuum sealer — has part — Vacuum pump. A pump.
2. Step 2. Vacuum pump — is part of — Mass spectrometer. A vacuum system.
3. Step 3. Mass spectrometer — uses — Electromagnet. Deflecting ions with a field.
4. Step 4. Electromagnet — is part of — Electrical telegraph. Morse’s receiver.

Open Evothings