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

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

1910-1920

Replica concave diffraction grating

1913, 14 November

flat plane Thorp gratings

1902

Right-angled prism with replica grating on hypotenuse

1895-1905

Replica plane diffraction grating

1900-1949 (estimated)

flat plane Thorp grating

1902

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

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

Concave Thorp grating (prepared by T. Thorp himself)

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)