Most likely she read the several extensive and instructive articles on the processes of photography that she herself used, in her copy of the English "Art-Journal" from vol.12, of 1850; in fact, it is presumed that the first photograph How made was of a Richard Austin Artlett engraving from the same volume, a portrait on page 297 of Emma Jane, Dowager Countess of Darnley after the unfinished painting by Sir Thomas Lawrence, now in the British Museum.