John Herschel Produced This Pencil Drawing Of The Nebulosity In The Eta Argus Region Of The Southern

John Herschel produced this pencil drawing of the nebulosity in the Eta Argus region of the southern sky on April 15, 1836 using his 6.4-m focal length reflector at Feldhausen, Cape Town, South Africa. Notice how a triangular skeleton of field stars are used to help position the nebulosity. (Monograph on Argus, John Herschel Papers, RAS: JH 3/1.8, p.10)

Review: Observing by Hand: Sketching the Nebulae in the Nineteenth Century, by Omar W Nasim