I spent the afternoon at the National Museum of Natural History in D.C. I was at the Mollusk library for several hours looking up stuff. As I was getting ready to leave, I noticed this ancient contraption on a shelf.
I took it down, slid a piece a paper under the brown disk and push the lever down. The raised image it created on the paper was for the library's Bartsch Collection.
Paul Bartsch (1871-1960) was a malacologist and a curator in the Division of Mollusks of the National Museum of Natural History from 1914 to 1946. (Back then, the museum was called the U.S. National Museum.) After Bartsch died, his collection of books was probably given to the museum's library.