Finlay’s Comet. Photograph I, 1882 Oct. 19d 15h 45m. Exposure 30m, equivalent focus of lens about 11 inches

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David Gill , “Finlay’s Comet. Photograph I, 1882 Oct. 19d 15h 45m. Exposure 30m, equivalent focus of lens about 11 inches,” Bibliothèque numérique - Observatoire de Paris, consulté le 18 janvier 2020, https://bibnum.obspm.fr/ark:/11287/33R7x.