Title continues: “with intensities in arc, spark or discharge tube of more than 100,000 spectrum lines most strongly emitted by the atomic elements under normal conditions of excitation between 10,000 A. and 2000 A., arranged in order of decreasing wavelength”. From The Technology Press, MIT. Dark brown cloth-covered boards, gilt titles to spine, 429 pages. Condition: Boards rubbed and slightly mottled, previous owner’s name to front free end paper, some pencil notes to rear paste down. Pages clean and bright, binding sound; from a personal collection.