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| Keywords: ChartersOfFreedom 032.jpg With the document in position the cover glass was placed over it to keep it from wrinkling Before placing the bronze bracket two leak detector cells were sealed in slots cut in the bracket These cells detected any change in the composition of the gas within the enclosure Wires leading to the cells passed through a Kovar tube in which they were fixed by a glass bead Louis Gilles of the Libbey-Owens-Ford Glass Company seals the Kovar tube in a hole in the lead strip which is attached to the glass panels 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 Libbey-Owens-Ford Company United States Declaration of Independence | ||||
