Interior of the Equatorial Room of Professor Henry Draper’s Observatory at Hastings on Hudson, near New York […] showing the 28 inch Silvered Glass Reflector, the 12 inch Achromatic, and the 5 inch Finder (titre original)

Specola Vaticana : l’équatorial photographique Henry-Gautier (titre original)

Photographie du spectre d’Arcturus ; et Photographie du spectre de Vega, par MM. Henry. Prisme de crown de 22° (titre original)

First Photograph of the Nebula in Orion, taken by Professor Henry Draper, M.D. ; September 30th, 1880, exposure 51 minutes (titre original)

Photograph of the Nebula in Orion, taken by Professor Henry Draper, M.D., March 11th, 1881. Exposure 104 minutes. (titre original)

Photograph of the Nebula in Orion, taken by Professor Henry Draper, M.D., March 14th, 1882. Exposure 137 minutes (titre original)

Photographie du spectre de Wega, prisme de crown de 30° ; et Photographie du spectre d’Arcturus, prisme de flint de 45°, par MM. Henry (titre original)