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Glass photographic plate showing an x-ray image of a human hand

1896-1899
452 stereoscopic pairs of cloud chamber photographs and five single photographs of electric discharges (all glass negatives)

Cloud chamber photographs, 1922

1922
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)
Scientific stereoscope for use on desk or bench top by Carl Zeiss Jena, Nr. 5284, and 14 (plus one duplicate) out of a set of 20 stereographs, post-1908

Scientific stereoscope for use on desk or bench top by Carl Zeiss Jena

1908-1914 (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)