Compasses
device · 500 BC · Ancient world
A tool for drawing circles.
What it is made of
- Compass legs — has part. A needle and a lead holder.
- Pivot joint — has part. The pivot of the opening.
Principles and materials it uses
Where it is used
- Mercator projection — is used in. The map grid was built with compasses and a ruler.
- Euclidean geometry — is used in. Constructions with compass and straightedge.