Brass component from "Twin Equatorial" Telescope (telescope - Cassegrain; telescope - refracting; telescope - reflecting)
Twin reflecting and refracting telescopes on observatory mounting, 1885 (telescope - Cassegrain; telescope - refracting; telescope - reflecting)
Transparency, 10"x8", showing double open cluster in Perseus. N.G.C. 869 and 884 (black-and-white prints (photographs); astrophotographs; star clusters)
Photograph of the Dumb-bell Nebula (M27) (black-and-white prints (photographs); astrophotographs; planetary nebulae)
Photograph of the Pleides star cluster with nebulosity (M45) (black-and-white prints (photographs); astrophotographs; star clusters)
Photograph of the Andromeda Galaxy (M31) (black-and-white prints (photographs); astrophotographs; galaxies)
Photograph of stars in the constellation of Cygnus (black-and-white prints (photographs); astrophotographs; stars)
Photograph of Whirlpool Galaxy (M51), taken by Isaac Roberts, 1889 (black-and-white prints (photographs); astrophotographs; galaxies)