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Photograph (Gelatine Print) of H. G. J. Moseley in the Balliol-Trinity Laboratories, Oxford, 1910

preview image for Photograph (Gelatine Print) of H. G. J. Moseley in the Balliol-Trinity Laboratories, Oxford, 1910
Inventory Number: 18874
Object Type:
Place Created: Oxford England United Kingdom Europe
Accession Number: 1964-95
Brief Description: This black and white gelatine print of Henry Moseley was taken in the Balliol-Trinity laboratory at Trinity College, Oxford around the time of Moseley’s graduation from Trinity College, Oxford in 1910 and a few months before he moved to Manchester to work with Ernest Rutherford for his postgraduate research. The photograph is one in a series taken of individuals in various scientific laboratories in Oxford around 1910.

Moseley used X-rays to analyse the properties of elements in a new and brilliant way: he generated characteristic X-rays of sample elements and analysed them in the spectrometer. Moseley placed the specimens he wanted to investigate in an X-ray tube and created a vacuum by evacuating air from the X-ray tube and spectrometer. He made use of the effect that when an element is bombarded with energetic electrons X-rays with characteristic wavelengths are produced. These different wavelengths led to the X-rays being reflected at different angles from the crystal in the centre of the spectrometer. So when X-ray beams of different wavelengths hit a photographic plate they will create distinct lines. The angular position and separation of these lines are unique for each element. These values helped Harry to determine the wavelengths of the lines and hence the number of protons in the element’s nucleus.

See attached narrative 'Henry 'Harry' Moseley and his experiments' for further details.
Primary Inscriptions:
Provenance: Transfer from the Department of Inorganic Chemistry (per Dr. E. J. Bowen) in 1964.
Collection Group:
Material(s): Paper

Narratives

Image with multimedia irn 49576Image with multimedia irn 53681

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