Diffraction ruling on glass sheet, 8 x 8cm with circular grating. 6.5cm diameter. Marked 6000. Diffraction ruling on glass sheet
Diffraction grating 1800 gr/mm on 6 inch diameter blank, produced by interference Diffraction grating 1800 gr/mm on 6 inch diameter blank
Ebert grating spectrograph E543 by Hilger & Watts Ltd., London, 1967-1968 Ebert grating spectrograph E543 by Hilger & Watts Ltd. 1967-1968
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. selection of 8 sets of diffraction rulings on polished steel 1820-1829
Three 60mm diameter concave discs with 18 x 48mm ruled surfaces. Approximately 14,000 line per inch. Thorp Replica Diffraction Gratings
Perkin-Elmer Grating Infrared Spectrophotometer type 157G. Perkin-Elmer Grating Infrared Spectrophotometer
Diffraction grating on glass approx 1cm on thin glass disc 32mm diameter. In glass topped box. Diffraction Grating on Glass