Metronome and piston pump: what they have in common

1. Step 1. Metronome — has part — Escapement. A trigger.
2. Step 2. Escapement — is part of — Tower clock. An escapement sets the pace.
3. Step 3. Tower clock — has part — Bell. The chime of the clock.
4. Step 4. Bell — is part of — Diving bell. A body open at the bottom.
5. Step 5. Diving bell — evolved into — Diving suit. Individual equipment.
6. Step 6. Diving suit — has part — Piston pump. Air was pumped from the surface.

Open Evothings