Moon craters, 1872.
© Science Museum / Science & Society Picture Library
Lithographic colour print isued by Harvard College Observatory in 1876, showing four sketches of craters on the Moon (Agatharchides, Hypatia, Guttemberg & Julius Ceasar). Produced in 1872 by Etienne Leopold Trouvelot (1827-1895), a French artist, these views were produced using the observatory's 15-inch refracting telescope made by Merz of Munich, Germany. At this time, drawings made at the telescope using only the eyes showed more detail than could be produced using the insensitive photographic plates then available.