Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Tools and Equipment (hierarchy name)
5. equipment
6. [equipment by profession or discipline]
7. [equipment for science and technology]
8. scientific instruments
9. astronomical instruments
10. astronomical telescopes
11. refracting telescopes

Anotations

Scope note:

Refracting telescopes named after the telescope Galileo first constructed in 1609. Galilean telescopes are each designed with one convergent and one concave, or divergent, lens, with the divergent lens acting as the ocular lens, and the convergent lens as the objective lens that creates the image.