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{
    "localId": "486498091",
    "label": "Report, OSI - 3/49, Central Intelligence Agency, Vacuum Tube Development at Oberspreewerke and Its Significance to Soviet Electronic Developments",
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    "citationUrl": "https://catalog.archives.gov/id/486498091"
}

{
    "id": "486498091",
    "sourceUrl": "https://catalog.archives.gov/id/486498091",
    "contentType": "document",
    "title": "Report, OSI - 3/49, Central Intelligence Agency, Vacuum Tube Development at Oberspreewerke and Its Significance to Soviet Electronic Developments",
    "citationUrl": "https://catalog.archives.gov/id/486498091",
    "collections": [
        "President's Secretary's Files (Truman Administration)",
        "Intelligence Files"
    ],
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{
    "url": "https://catalog.archives.gov/id/486498091",
    "naId": 486498091,
    "levelOfDescription": "item",
    "productionDates": [
        {
            "day": 28,
            "logicalDate": "1949-10-28",
            "month": 10,
            "year": 1949
        }
    ],
    "recordType": "description",
    "ocrSource": "nara-archive"
}

{
    "seq": 17,
    "pageIndex": 0,
    "type": "photo",
    "url": "https://s3.us-east-1.amazonaws.com/NARAprodstorage/lz/presidential-libraries/truman/hst-psf/602196/875491/875491-02-017.tif",
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    "ocrText": "SECRET\nluminous material (possibly zinc sulphide) is now being used which has Soviet approval.\nThe Soviet supervisors are reported to have said that the color of the cathode-ray tubes\nis unimportant. (Note: Unimportant, apparently, for their own purposes.)\nSome months previous to November 1948 the German technicians at the OSW\nasked the Soviets to provide fluorescent materials for the coating of the screens of\ncathode-ray tubes. In November 1948 there arrived (supposedly from Moscow) supplies\nof a yellow powder emanating a yellow-red light (thought to be zinc-cadmium sulphide)\nand a white powder emanating a blue light (thought to be zinc sulphide). (Note: These\nmay be for long-persistence screens which are very necessary in certain tracking\nequipments.)\nRecipes for the production of fluorescent compositions are given in the table\nwhich follows. Formulas, certain production details, color, and usage are shown.\nGlow\nPersistence\nDesignation\nRaw Material\nActivator\nColor\nTemperature in Hours\nN1 blue/1\nZnS\nSilver 1x10-5\nlight-blue\n800°\n1.5\nNickel 1x10-7\nCopper 1x10-5\nN1 blue/2\nZnS\ndo\ndark blue\nmore violet\n1100°\n0.5\nN1 blue/3\nZnS\ndo\ndeep-blue\n900°\n3\nN1 green/1N\nZnS\nCopper 1x10-7\ngreen\n400°\n1\n800°\n0.5\n1000°\n2\nN2 yellow/2\nZnS CdS\nSilver\nyellow\n750°\n1\nNickel\nN2 orange/1N ZnS CdS\nCopper\ngreenish\n1100°\n0.75\no\nN3/yellow/1\nZnS ZnSe\nSilver 5x10-5\nyellow\n800\n1.5\nNickel 5x10-8\nN3 green/1\nZnS ZnSe\nNickel\ngreen\n7000\n1\nCopper\nN3 blue-white\nZnS ZnSe\nSilver\nlight-blue\n7000\n1\nNickel\nN4 green\nZnO ZnS\n-\ngreen\n8009\n1\nN5 green\nZnSiO 3\n0.8-1%\ngreen\n12500\n5\nManganese\nN6 yellow\nZnO SiO 2\n1.2-3%\nyellow\n1180°\n4\nManganese\nN6 orange\nZnO SiO\n1.2-3%\norange\n11600\n4\n2\n(BeO)\nManganese\nNg blue-white MgO WO 3\n-\nblue-white\n1050°\n1.5\nN2 green\nZnS CdS\nSilver 5x10-5\ngreen\n8500\n1\n- 13 - -\nSECRET"
}