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Pair of glass crossed diffraction gratings in single mount

1900-1956

Hartridge prism

1984

Diffraction grating with focal power

1973-1983

Replica of Rowland's Diffraction Grating

1905-1915

Ultraviolet grating spectrophotometer

Thorpe diffraction grating 14950 lines per inch

Circular diffraction gratings

Circular diffraction grating

Mounted on round brass levelling stand.

Thorpe's Transparent Relica of Rowland's Diffraction grating

1.6cm diameter concentric circular ruling on 1.9cm steel disc.

diffraction ruling on metal

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
Perkin-Elmer 257 IR grating spectrometer.

Perkin-Elmer 257 IR grating spectrometer.

circa 1980
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
Diffraction grating

Diffraction grating

1963
68mm diameter on 80mm square glass. In Sanger-Shepherd filter box.

Circular diffraction grating

SP 200G grating infrared spectrophotometer made by Unicam

SP 200G grating infrared spectrophotometer

Three 60mm diameter concave discs with 18 x 48mm ruled surfaces. Approximately 14,000 line per inch.

Thorp Replica Diffraction Gratings

Diffraction grating, 2400 gr/mm on six inch blank, produced by interference

Diffraction grating

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

Two diffraction gratings.

Two Diffraction Gratings