Truss bridge et hammer : ce qu'ils ont en commun

1. Étape 1. Truss bridge — utilise — Railway track. Railway bridges.
2. Étape 2. Railway track — utilise — Rolling mill. Rails are rolled.
3. Étape 3. Rolling mill — utilise — Water wheel. The first mills were turned by water.
4. Étape 4. Water wheel — fait partie de — Trip hammer. The shaft was turned by a water wheel.
5. Étape 5. Trip hammer — a évolué de — Hammer. A trip hammer is a hammer lifted and dropped by a water wheel.

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