Spring mattress and paper machine: what they have in common

1. Step 1. Spring mattress — is made of — Cotton. The cover is cotton fabric.
2. Step 2. Cotton — is used in — Spinning jenny. It spins cotton and wool.
3. Step 3. Spinning jenny — evolved from — Spinning wheel. Many spindles driven by one wheel.
4. Step 4. Spinning wheel — has part — Belt drive. The wheel is linked to the spindle by a cord.
5. Step 5. Belt drive — is part of — Paper machine. The wire moves on belts and rolls.

Open Evothings