Glass bell jar receiver and bell: what they have in common

1. Step 1. Glass bell jar receiver — is part of — Boyle’s air pump. A bell jar from which the air is pumped out.
2. Step 2. Boyle’s air pump — evolved from — Vacuum pump. An improved version of Guericke’s pump.
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 — Diving suit. Air was pumped from the surface.
5. Step 5. Diving suit — evolved from — Diving bell. Individual equipment.
6. Step 6. Diving bell — has part — Bell. A body open at the bottom.

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