The Trouvelot Astronomical Drawings are fifteen wonderful illustrations by the French astronomer and artist Étienne Léopold Trouvelot (December 26, 1827 – April 22, 1895). They can be found in a public domain collection at the New York Library Digital Collections. Unfortunately Trouvelot, who was an amateur entomologist, will be forever remembered for introducing the Gypsy Moth into the United States.
The drawings can be found here. The images are in the public domain and can be used without restriction.
Image: Mare Humorum – Science, Industry and Business Library: General Collection , The New York Public Library. “Mare Humorum. From a study made in 1875.” New York Public Library Digital Collections. http://digitalcollections.nypl.org/items/510d47dd-e6ca-a3d9-e040-e00a18064a99
– Your Joyful Benefactor