Trade card: Andrew Ross, 2, Featherstone Buildings, High Holborn. 1853. A printed table of magnifying powers of object- and eye-glasses of a microscope. Values inserted in manuscript. (Calv. 323) (C.C. 142)
Note: The dimensions of the card are reported as being 120mm x 185mm, whereas the Trade Card catalogue shows the card having dimensions 98mm x 158mm.