Stirrup tread et rolling mill : ce qu'ils ont en commun

1. Étape 1. Stirrup tread — fait partie de — Stirrup. A foot rest.
2. Étape 2. Stirrup — a évolué de — Saddle. The stirrup added a foot support to the saddle.
3. Étape 3. Saddle — fait partie de — Bicyclette. The bicycle saddle took its name from the horse saddle.
4. Étape 4. Bicyclette — a inspiré — Wright Flyer. The experience of the Wrights’ bicycle shop — chains, light structures, the idea of controlled instability.
5. Étape 5. Wright Flyer — utilise — Railway track. The Flyer had no wheels: it took off along a wooden rail.
6. Étape 6. Railway track — utilise — Rolling mill. Rails are rolled.

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