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| Keywords: ChartersOfFreedom 037.jpg During the humidifying process pure helium was allowed to flow through the enclosure for two weeks to assure that all of the air was completely driven from the enclosure and replaced by humidified helium The Declaration of Independence and the Constitution of the United States were constantly guarded during this long process by guards on the staff of the Library of Congress 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 | ||||
