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. [temporary alphabetical list: astronomical instruments]

Anotations

Scope note:

Telescopes that have both reflecting and refracting elements to produce magnified images. Schmidt telescopes were invented by Bernhard Schmidt of the Bergedorf Observatory in Hamburg, in 1930. Each Schmidt telescope has a spherical primary mirror which then passes light through a spherical corrective lens, thus eliminating spherical aberrations from the mirror.