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    "label": "Spectrohelioscope",
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    "metadata": [
        {
            "label": "Collection",
            "value": "Caltech Photographs"
        },
        {
            "label": "Series",
            "value": "Photographs of Individuals"
        },
        {
            "label": "Dates",
            "value": [
                "1929"
            ]
        },
        {
            "label": "Extents",
            "value": [
                "1 photographs"
            ]
        },
        {
            "label": "Abstract",
            "value": [
                "Perspective drawing of Anderson\u2019s rotating prisms, for use with fixed slits, for spectrohelioscope. Pencil and ink on paper, backed with graph paper, 8.5 x 11 inches, signed R. W. P., dated 1929. George E. Hale, \u201cThe Spectrohelioscope and its Work, Part I: History, Instruments, Adjustments, and Methods of Observation, The Astrophysical Journal 70 (December 1929): 265-311. Published as Plate XIV. Porter Papers."
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        }
    ],
    "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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