Ski tip e tunnelling shield: o que têm em comum

1. Passo 1. Ski tip — faz parte de — Skis. A bent end.
2. Passo 2. Skis — funciona como — Snowshoes. Two ways of not sinking into snow.
3. Passo 3. Snowshoes — é feito de — Leather. The webbing was woven from rawhide strips.
4. Passo 4. Leather — é material para — Esteira transportadora. The first belts were leather.
5. Passo 5. Esteira transportadora — faz parte de — Tunnel boring machine. Spoil is removed by a conveyor.
6. Passo 6. Tunnel boring machine — evoluiu de — Tunnelling shield. A development of the tunnelling shield.

Abrir Evothings