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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

Glass plate

Glass plate

1878

Replica plane diffraction grating

Replica plane diffraction grating

1900-1949 (estimated)

Transmission diffraction grating

Transmission diffraction grating

1950-1958

photographic diffraction grating (3001 lines to the inch)

photographic diffraction grating (3001 lines to the inch)

1888

Direct vision grating pocket microscope, 1890-1900

Direct vision grating pocket microscope, 1890-1900

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

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

photographic replica diffraction grating (3000 lines to the inch)

photographic replica diffraction grating (3000 lines to the inch)

1888

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, 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, 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

Set of 5 transmission gratings in single mount

Set of 5 transmission gratings in single mount

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)

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)

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

Exhibit showing application of plane transmission diffraction grating of high dispersion for examining spectra

Exhibit showing method of examining spectra

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)