Ruler
device · 2650 BC · Ancient world
A measuring strip with graduations.
What it is made of
- Measurement scale — has part. Marked graduations.
- Ruler body — has part. Wood, metal or plastic.
Principles and materials it uses
- Copper — is made of. The Nippur cubit (~2650 BC) is a rod of copper alloy.
- Wood — is made of. Egyptian cubit rods were wooden.
History: what it evolved from and what it influenced
- Tape measure — evolved into. A flexible ruler.
- Vernier caliper — evolved into. Precise measurement of dimensions.