This consists of a two-sided cardboard planisphere of the northern and southern skies, seven clear plastic altitude-azimuth templates for use at different latitudes up to 70° north and south, and a cardboard envelope. Gilbert Rude donated it to the Smithsonian in 1958. The instrument bears the inscription "STAR IDENTIFIER, Adapted from the ‘Rude Star Finder and Identifier’ originated by Captain G. T. Rude, U.S. Coast & Geodetic Survey . . . Hydrographic Department, Admiralty, London. Sept. 1941 (H.S. 4026 /40)."
Ref: G. T. Rude, "Star Finder and Identifier," U.S. patent #1,401,446.
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