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| Keywords: ChartersOfFreedom 023.jpg While helium was flushed through the document enclosure periodic checks with the leak detector revealed the degree to which oxygen had been displaced with pure helium After all of the air was replaced by helium the inlet and outlet tubes were sealed and removed from the enclosure E C Creitz pictured was connecting the ammeter to the conductivity cells during the flushing operation 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 | ||||
