Door hinge and rolling mill: what they have in common

1. Step 1. Door hinge — is made of — Bronze. Ancient hinges were bronze.
2. Step 2. Bronze — is material for — Rivet. Ancient rivets were copper and bronze.
3. Step 3. Rivet — is part of — Steel frame. Early frames were riveted.
4. Step 4. Steel frame — has part — I-beam. I-beams.
5. Step 5. I-beam — uses — Rolling mill. Rolling.

Open Evothings