File
device · 1200 BC · Ancient world
A steel bar with cut teeth for filing.
What it is made of
- File teeth — has part. Rows of fine teeth.
- Tang — has part. The end for the handle.
- Handle — has part. A handle.
Principles and materials it uses
- Steel — is made of. Hardened steel with cut teeth.
- Friction — uses. Material is removed by the friction of the teeth.
- Bronze — is made of. Ancient files were bronze, then iron.
Things built in a similar way
- Sandpaper — works like. Removing material with small cutting edges.