BARRITT, Leon and SERVISS, Garrett
The Barritt-Serviss star and planet finder. Southern Hemisphere
New York : Leon Barritt, 1906. Lithographed celestial map printed on thick boards, pinned with central axis to revolve in a lettered board frame, string and brass pins, printed instructions for viewing the stars and planets in the Southern Hemisphere, a couple of very minor stains but overall very good condition, fully working. Leon Barritt was a publisher in New York who copyrighted this form of dial, and Garrett Serviss was a famous science and science fiction writer and lecturer.
Another example was created for the Northern Hemisphere, the Southern Hemisphere model is quite scarcer, presumably due to the smaller population fewer examples were manufactured.