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    "@id": "https://digital.archives.caltech.edu/collections/Photographs/CDA5.10-13/manifest.json",
    "label": "Cloud chamber photo of pi-mesons produced out of nuclear disintegration",
    "thumbnail": {
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    },
    "metadata": [
        {
            "label": "Collection",
            "value": "Caltech Photographs"
        },
        {
            "label": "Series",
            "value": "Photographs of Individuals"
        },
        {
            "label": "Dates",
            "value": [
                "1935"
            ]
        },
        {
            "label": "Extents",
            "value": [
                "1 photographs (negative)"
            ]
        },
        {
            "label": "Abstract",
            "value": [
                "Anderson notes that he wrote a letter to Robert Millikan saying that they were mesons, but Millikan refused to believe it. Pi- and mu-mesons were not clearly distinguished until the 1950s. Carl Anderson Papers."
            ]
        }
    ],
    "attribution": "<p>These digitized collections are accessible for purposes of education and research. Due to the nature of archival collections, archivists at the Caltech Archives and Special Collections are not always able to identify copyright and rights of privacy, publicity, or trademark. We are eager to <a href=\"mailto:archives@caltech.edu\">hear from any rights holders</a>, so that we may obtain accurate information. Upon request, we\u2019ll remove material from public view while we address a rights issue.</p>",
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                    "width": "1928",
                    "height": "1333",
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