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. optical instruments
9. microscopes

Narrower term/s

• scanning electron microscopes

Anotations

Scope note:

Microscopes in which a beam of electrons is focused by means of magnetic and electrostatic lenses onto a specimen and scattered by it to produce an image. The resolving power and the magnification of an electron microscope are much greater than can be obtained with an optical icroscope. microscope. The specimen must be examined in a vacuum, which necessitates special techniques for preparing it, and the electrons are usually focused onto a fluorescent screen (for direct viewing) or onto a photographic plate.