Ion source and rock drill: what they have in common

1. Step 1. Ion source — is part of — Mass spectrometer. It ionizes the substance.
2. Step 2. Mass spectrometer — has part — Vacuum pump. A vacuum system.
3. Step 3. Vacuum pump — evolved into — Boyle’s air pump. An improved version of Guericke’s pump.
4. Step 4. Boyle’s air pump — has part — Piston. A plunger.
5. Step 5. Piston — is part of — Rock drill. A percussion piston.

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