Prang's Prismatic Spectrum with the Frauenhofer Lines
Boston, Massachusetts: Prang Educational Company [ 1882-1897 ]. Inside the frame edge is 9 3/4 x 39 3/4 inches. Frame dimensions are somewhat larger. Chart labeled "Prang's Prismatic Spectrum | with the Frauenhofer Lines | The Space Values of the Colors in this Spectrum are based upon measurements given by..... More