Replica of Rowland's Diffraction Grating
1905-1915
Perkin-Elmer Grating Infrared Spectrophotometer
Ultraviolet grating spectrophotometer
Circular diffraction grating
Diffraction Grating on Glass
Thorpe diffraction grating 14950 lines per inch
Circular diffraction gratings
Two Diffraction Gratings
Hartridge prism
1984
Diffraction grating with focal power
1973-1983
diffraction ruling on metal
Diffraction Grating
1910-1915
Perkin-Elmer 257 IR grating spectrometer
circa 1980
SP 200G grating infrared spectrophotometer
Pair of glass crossed diffraction gratings in single mount
1900-1956
Diffraction grating
1963
Perkin-Elmer 257 IR grating spectrometer.
circa 1980
Thorp Replica Diffraction Gratings
Thorpe's Transparent Relica of Rowland's Diffraction grating
Diffraction grating
Accessories for Ebert Grating Spectrograph
1967-1968
Thorpe's transparent replica of Rowland metal diffraction grating
Diffraction ruling on glass sheet
Diffraction grating 1800 gr/mm on 6 inch diameter blank
selection of 8 sets of diffraction rulings on polished steel
1820-1829
Control system for Ebert grating spectrograph
1967-1968
Arc control unit for Ebert grating spectrograph
1967-1968
Metal containers and mirror for Ebert Grating Spectrograph
1967-1968
Ebert grating spectrograph E543 by Hilger & Watts Ltd.
1967-1968