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Other factors in the deterioration were the sunlight and seasonal heat and cold to which the document was exposed between 1841 and 1894. For the first 35 years it hung, unprotected, before a window on the wall of the Patent Office. In 1876, it was lent to Philadelphia for its centennial celebration. Returned later, it was exhibited in a cabinet in the State Department’s library.
Meantime, concern was growing about the condition of the Declaration. In 1894, the State Department announced it had been removed from public view and had been stored in a steel case.
As years passed, the authorities decided the document could be safely displayed, after all, with proper precautions. It was therefore transferred, in 1924, to the Library of Congress, and shown under doublepane, filterequipped plate glass. Eventual, ly, still more protection was provided by improved filters and by sealing the parchment in an enclosure filled with properly humidified helium.
With one notable exception, the Declaration remained in the Library of Congress until it was
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