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| Keywords: ChartersOfFreedom 034.jpg Preparatory to flushing pure helium through the enclosure copper tubing leading from the source of pure helium was connected to the inlet tube of the test enclosure to flush all aur from the assembly E C Creitz pictured of NBS sealed the inlet tube from the helium humidifier to the short tube leading into this enclosure In front of the enclosure pictured the bubble counter and emergency seal on the outlet tube connected to the lower right corner of the enclosure National Institute of Standards and Technology National Institute of Standards and Technology The images in the ChartersOf Freedom Photographic Collection are in the public domain and are not subject to copyright in the United States However please pay special attention to the individual works to make sure there are no copyright restrictions indicated Individual works may require securing other permissions from the original copyright holder Use of the images from NIST Digital Collections is not restricted but a statement of attribution is required Please use the following attribution statement National Institute of Standards and Technology Digital Collections Gaithersburg MD 20899 PD-USGov National Bureau of Standards National Institute of Standards and Technology United States Declaration of Independence | ||||
