6 Diagrams of Rulings on Card
6 diagrams of rulings on card.
selection of 8 sets of diffraction rulings on polished steel, 7 of 8 in individual cylindrical wooden cases, one loose, with 6 diagrams of rulings on card, in velvet-lined leather covered case, by Robert Bancks (unsigned), London, England, c. 1826.
6 diagrams of rulings on card.
Selection of 8 sets of diffraction rulings on polished steel, 7 of 8 in individual cylindrical wooden cases, one loose, in velvet-lined leather covered case, by Robert Bancks (unsigned), London, England, c. 1826.