Balance scale
device · 3000 BC · Ancient world
Scales based on an equal-armed lever.
What it is made of
- Balance beam — has part. An equal-armed lever.
- Balance pans — has part. For the load and weights.
- Knife-edge pivot — has part. A low-friction pivot for the beam.
- Set of brass weights — has part. Reference masses.
Principles and materials it uses
- Lever — uses. A balance is an equal-armed lever.
- Wood — is made of. The beam of a balance is wooden or bronze.
- Stone — is made of. Weights were hewn from stone.
History: what it evolved from and what it influenced
- Electronic scales — evolved into. Electronic scales.
What it is a kind of
- Kitchen scale — includes. Scales.