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{
    "localId": "486498019",
    "label": "Report, OSI - 1/49, Central Intelligence Agency, An Estimate of Swedish Capabilities in Science",
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{
    "id": "486498019",
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    "contentType": "document",
    "title": "Report, OSI - 1/49, Central Intelligence Agency, An Estimate of Swedish Capabilities in Science",
    "citationUrl": "https://catalog.archives.gov/id/486498019",
    "collections": [
        "President's Secretary's Files (Truman Administration)",
        "Intelligence Files"
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    "levelOfDescription": "item",
    "productionDates": [
        {
            "day": 9,
            "logicalDate": "1949-08-09",
            "month": 8,
            "year": 1949
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    "seq": 62,
    "pageIndex": 0,
    "type": "photo",
    "url": "https://s3.us-east-1.amazonaws.com/NARAprodstorage/lz/presidential-libraries/truman/hst-psf/602196/875491/875491-01-062.tif",
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    "ocrText": "SECRET\nThe Division of Steam Engineering has three tunnels, \"A,\" \"B,\" and \"C,\"\noperating from a common compressor chamber of 234 cu ft and 170 lbs/sq in. Air used\nin the tunnels is passed through an oil fog filter, and through silica gel for moisture\nremoval. Tunnel \"A\" was built primarily for investigations of dynamic problems\n(Flygmotor AB), tunnel \"B\" for aerodynamic problems (Swedish Air Force), and\ntunnel \"C\" for ballistic investigations (Bofors). A heating plant for the compressed\nair has been projected, which, according to calculations, will yield a theoretical mach\nof 4 with air at 180° C.\nTunnel \"A\" (for gas dynamics)\nPower\nIngersoll-Rand compressor, 170 lbs/sq\nin. in a 26 cu yd tank\nSpeed\nmach 1\nFlow circuit\ninduction, non-return\nThroat\nclosed, 2 in. X 6 in.\nOperation\nintermittent\nTemperature control\nnone\nPressure control\nnone\nHumidity control\nsilica gel with reverse flow\nWorking pressure\nmaximum 140 lbs/sq in.\nBalance system\none component, electric\nTunnel \"B\" (for aerodynamic tests)\nPower\nsame as \"A\"\nSpeed\nmach 1.4 to 2.2\nFlow circuit\ninduction, non-return\nThroat\nclosed, 6 in. X 5 in.\nOperation\nintermittent\nTemperature control\nnone\nPressure control\nnone\nHumidity control\nsilica gel with reverse flow\nWorking pressure\nmaximum 140 lbs/sq in.\nBalance system\none component, electric\nTunnel \"C\" (for ballistic tests)\nPower\nsame as \"A\"\nSpeed\nmach 1 to 3\nFlow circuit\ninduction, non-return\nThroat\nclosed, 6 in. X 6 in.\nOperation\nintermittent\nTemperature control\nnone\nPressure control\nnone\nHumidity control\nsilica gel with reverse flow\nWorking pressure\nmaximum 140 lbs/sq in.\nBalance system\none component, electric\n(2) Aeronautical Research Institute (FFA)\nThe Aeronautical Research Institute has three wind tunnels in operation,\nproviding air speeds from 224 mil/hr to mach 2.5.\nThe low-speed tunnel has no outstanding features. It utilizes a mechani-\ncal, six-component balance with automatic printing devices manufactured by the\nToledo Company of the United States.\nSECRET\n56"
}