Photograph of a pastel drawing of the Ring Nebula (M57) in Lyra from observations by Prof. E.S. Holden, dated Oct 25th 1875, using telescopes of the United States Naval Observatory at Foggy Bottom, Washington, DC. Photograph of a pastel drawing of the Ring Nebula in Lyra 1876
Photograph of a pastel drawing of the planet Saturn from observations by M. Etienne Leopold Touvelot (artist), September 1875, using telescopes of the United States Naval Observatory at Foggy Bottom, Washington, DC. Photograph of a pastel drawing of the planet Saturn from observations by M. Etienne Leopold Touvelot (artist) 1876
One of two photographs showing a transit circle by Pistor and Martin at the U.S. Naval Observatory, Washington. One of two photographs showing a transit circle by Pistor and Martin at the U.S. Naval Observatory 1876
Two photographs presented by Rear Admiral C.H. Davis in 1876, showing three transit instruments at the United States Naval Observatory. Two photographs presented by Rear Admiral C.H. Davis in 1876 1876