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    "label": "Cloud chamber photo of tracks of a positron",
    "thumbnail": {
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    },
    "metadata": [
        {
            "label": "Collection",
            "value": "Caltech Photographs"
        },
        {
            "label": "Series",
            "value": "Photographs of Individuals"
        },
        {
            "label": "Dates",
            "value": [
                "1932 August 2"
            ]
        },
        {
            "label": "Extents",
            "value": [
                "1 photographs (negative)"
            ]
        },
        {
            "label": "Abstract",
            "value": [
                "On August 2, 1932, while photographing cosmic-ray tracks in a cloud chamber, Carl Anderson captured on film the track left behind of the first clearly identified positive electron. This photograph shows the particle moving upward, as determined by the increase in curvature of the top half of the track after it passed through the lead plate, and curving to the left, meaning its charge is positive. Anderson won the Nobel Prize in physics in 1936 for this discovery."
            ]
        },
        {
            "label": "General",
            "value": [
                "Carl Anderson Papers 5.10."
            ]
        }
    ],
    "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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