Wrench
device · 1840 · Industrial Revolution
A tool for turning nuts.
What it is made of
- Ratchet — has part. A ratchet wrench.
Principles and materials it uses
- Lever — uses. The length of the wrench increases the torque.
- Bolt and nut — uses. A wrench turns nuts.
- Wrought iron — is made of. Wrenches are wrought iron.