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Hartridge prism

1984

Diffraction grating with focal power

1973-1983

Pair of glass crossed diffraction gratings in single mount

1900-1956

Replica of Rowland's Diffraction Grating

1905-1915

diffraction ruling on metal

Thorpe diffraction grating 14950 lines per inch

Circular diffraction gratings

Ultraviolet grating spectrophotometer

Circular diffraction grating

Diffraction Grating

1910-1915

Diffraction Grating on Glass

Two Diffraction Gratings

Mounted on round brass levelling stand.

Thorpe's Transparent Relica of Rowland's Diffraction grating

Perkin-Elmer 257 IR grating spectrometer.

Perkin-Elmer 257 IR grating spectrometer.

circa 1980

Diffraction grating 1800 gr/mm on 6 inch diameter blank, produced by interference

Diffraction grating 1800 gr/mm on 6 inch diameter blank

Diffraction ruling on glass sheet, 8 x 8cm with circular grating. 6.5cm diameter. Marked 6000.

Diffraction ruling on glass sheet

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

Ebert grating spectrograph E543 by Hilger & Watts Ltd., London, 1967-1968

Ebert grating spectrograph E543 by Hilger & Watts Ltd.

1967-1968

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

Circular diffraction grating

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

Diffraction grating

Diffraction grating

1963

Perkin-Elmer Grating Infrared Spectrophotometer type 157G.

Perkin-Elmer Grating Infrared Spectrophotometer

SP 200G grating infrared spectrophotometer made by Unicam

SP 200G grating infrared spectrophotometer