Vacuum pump oil and aeroplane: what they have in common

1. Step 1. Vacuum pump oil — is part of — Vacuum pump. It seals the gaps.
2. Step 2. Vacuum pump — evolved into — Boyle’s air pump. An improved version of Guericke’s pump.
3. Step 3. Boyle’s air pump — has part — Piston. A plunger.
4. Step 4. Piston — is part of — Shock absorber. Inside, a piston moves in oil.
5. Step 5. Shock absorber — is part of — Landing gear. Shock struts.
6. Step 6. Landing gear — is part of — Aeroplane. Landing gear.

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