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photographic replica diffraction grating (6000 lines to one Paris inch)

photographic replica diffraction grating (6000 lines to one Paris inch)

1888
Right-angled prism with replica grating on hypotenuse

Right-angled prism with replica grating on hypotenuse

1895-1905
Replica plane diffraction grating

Replica plane diffraction grating

1900-1949 (estimated)
Glass plate

Glass plate

1878
photographic diffraction grating (3001 lines to the inch)

photographic diffraction grating (3001 lines to the inch)

1888
Transmission diffraction grating

Transmission diffraction grating

1950-1958
photographic replica diffraction grating (3000 lines to the inch)

photographic replica diffraction grating (3000 lines to the inch)

1888
Direct vision grating pocket microscope, 1890-1900

Direct vision grating pocket microscope, 1890-1900

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

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

Thorp's transparent replica of Rowland's metal diffraction grating 14520 lines/inch

Thorp's transparent replica of Rowland's metal diffraction grating 14520 lines/inch

1880-1899
Replica plane diffraction grating, usable area 64 x 64 mm, mounted on a glass lantern slide, with glass cover plated and taped edges, with label reading 'Ives' Photographic Replica of Diffraction Grating / C153, $1.50. Nearly 3,000 lines to the inch. / Sold by the Scientific Shop, Chicago.' Label annotated in red ink '2,888'.

Replica plane diffraction grating

1900-1949 (estimated)
Replica plane diffraction grating, usable area 64 x 64 mm, mounted on a glass lantern slide, with glass cover plated and taped edges, with label reading 'Ives' Photographic Replica of Diffraction Grating / C153, $1.50. Nearly 3,000 lines to the inch. / Sold by the Scientific Shop, Chicago.' Label annotated in red ink '2,888'.

Replica plane diffraction grating

1900-1949 (estimated)
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 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
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)
Set of 5 transmission gratings in single mount

Set of 5 transmission gratings in single mount

Original direct-reading wave-length spectrometer, invented by JW Gordon and E.U. Nelson (eye lens missing) with Thorpe diffraction grating. Note:- the Thorpe grating is on loan, but will be presented later.

Original direct-reading wave-length spectrometer

Photographic replica plane diffraction grating, area 27 x 27 mm, on glass plate, wrapped in a piece of paper marked in manuscript 'Photograph copy of / Spectrum Grating / 6000 lines per inch / Dr. . . . 's / Keep dry & do not rub / the film side'. [The three letters of the name are indecipherable.]

Photographic replica plane diffraction grating

1900-1949 (estimated)
Photographic replica plane diffraction grating, area 19 x 12 mm, on glass plate, wrapped in an envelope marked in manuscript 'Gratin (Replica) / made by photographing in much / reduced size a grating of lines / ruled in India ink on paper / by Mr. Barrow / I.C.Sc.T'. Very coarse line spacing.

Photographic replica plane diffraction grating

1907-1949 (estimated)
Exhibit showing application of plane transmission diffraction grating of high dispersion for examining spectra

Exhibit showing method of examining spectra