Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication (hierarchy name)
4. Visual Works (hierarchy name)
5. visual works (works)
6. [visual works by material or technique]
7. photographs
8. [photographs by form]
9. positives (photographs)
10. photographic prints
11. [photographic prints by process]
12. albumen prints

Anotations

Scope note:

Positive albumen prints upon glass widely used to create lantern slides and sometimes larger glass transparencies hung in windows for decoration; produced by a patented process called Hyalotype, developed and promoted by the Lingenheim brothers of Philadelphia from 1850. Distinguished from "crystalotypes" on paper produced by a similar process patented by J. A. Whipple of Boston.