Planetarium
device · 1923 · Electric age
A projector of the starry sky (Zeiss).
What it is made of
- Lens — has part. Projectors.
Principles and materials it uses
- Steel — is made of. The dome is a steel mesh with a concrete shell.
- Concrete — is made of. Zeiss’s first dome was thin concrete.
History: what it evolved from and what it influenced
- Orrery — evolved from. Models of the sky.