Aqualung and plough: what they have in common

1. Step 1. Aqualung — evolved from — Diving suit. Autonomy.
2. Step 2. Diving suit — has part — Piston pump. Air was pumped from the surface.
3. Step 3. Piston pump — evolved into — Watt steam engine. The first steam engines (Newcomen’s) pumped water out of mines by driving pumps.
4. Step 4. Watt steam engine — evolved into — Tractor. The first tractors were steam-powered.
5. Step 5. Tractor — uses — Steel plough. Ploughing with a tractor.
6. Step 6. Steel plough — evolved from — Plough. A steel share.

Open Evothings