Quern
device · 9000 BC · Stone Age
Two stones for grinding grain.
What it is made of
- Millstone — has part. Grain is ground between millstones.
Principles and materials it uses
- Friction — uses. Grain is crushed and ground by the friction of the stones.
Where it is used
- Bread — is used in. Flour was ground on millstones.
History: what it evolved from and what it influenced
- Gristmill — evolved into. The mill mechanized hand-turned millstones.
- Threshing machine — evolved into. Mechanizing the processing of grain.
What it is a kind of
- Stone tool — is a kind of. A quern is two stones: the upper one is turned on the lower to grind grain.