Electromagnetic lenses and syringe: what they have in common

1. Step 1. Electromagnetic lenses — is part of — Electron microscope. They focus the beam.
2. Step 2. Electron microscope — has part — Vacuum pump. A vacuum in the column.
3. Step 3. Vacuum pump — evolved from — Piston pump. Guericke adapted the piston pump to pump out air.
4. Step 4. Piston pump — works like — Syringe. A syringe is a hand-operated piston pump.

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