Stirrup tread e rolling mill: o que têm em comum
- Passo 1. Stirrup tread — faz parte de — Stirrup. A foot rest.
- Passo 2. Stirrup — evoluiu de — Saddle. The stirrup added a foot support to the saddle.
- Passo 3. Saddle — faz parte de — Bicicleta. The bicycle saddle took its name from the horse saddle.
- Passo 4. Bicicleta — inspirou — Wright Flyer. The experience of the Wrights’ bicycle shop — chains, light structures, the idea of controlled instability.
- Passo 5. Wright Flyer — utiliza — Railway track. The Flyer had no wheels: it took off along a wooden rail.
- Passo 6. Railway track — utiliza — Rolling mill. Rails are rolled.