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Replica concave diffraction grating

1913, 14 November

Thorps replica grating (2 1/8 x 1 3/8-inches) on glass (2 1/2 x 2-inches) of Rowlands metal diffraction grating

flat plane Thorp gratings

1902

Large Diffraction Astronomical Spectroscope to Thorp's design with two prism

1910-1920

Replica plane diffraction grating

1900-1949 (estimated)

flat plane Thorp grating

1902

Right-angled prism with replica grating on hypotenuse

1895-1905

Direct vision grating pocket microscope with adjustable slit made by T. Thorp, Manchester, with case, 1890-1900.

Direct vision grating pocket microscope with adjustable slit

1890-1900

Replica plane diffraction grating, area 17 x 16 mm, mounted on glass plate: inscription in white ink on black tape round sides of plate reads 'With T. Thorp's compliments / Thorp's Echelon Grating / 1000 grooves to inch'.

Replica plane diffraction grating

1900-1919 (estimated)

Replica plane diffraction grating, area 75 x 52 mm, mounted on glass plate with label reading 'Thorp's Transparent Replica of Rowland / Metal Diffraction Grating / 14495 lines to the inch'.

Replica plane diffraction grating

1900-1949 (estimated)

Replica plane diffraction grating, area 49 x 36 mm, mounted on glass plate with label reading 'Thorp's Transparent Replica of Rowland's / Metal Diffraction Grating / 14505 lines to the inch', and with 'The original is the property of Dr Common / Thomas Thorp / Whitefield [ . . . . ] / Oct 1906' [one word is indecipherable: reading of the year is also uncertain] written in white ink on the black edging tape.

Replica plane diffraction grating

1906, October

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

Thorp Replica Diffraction Gratings

Replica plane diffraction grating, area 17 x 16 mm, mounted on glass plate: inscription in white ink on black tape round sides of plate reads 'With T. Thorp's compliments / Thorp's Echelon Grating / 1000 grooves to inch'.

Replica plane diffraction grating

1900-1919 (estimated)

Concave Thorp grating (prepared by T. Thorp himself), with box and accessories

Concave Thorp grating (prepared by T. Thorp himself)