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4th July Independence Day

4th July Independence Day. RDM magazine and multimedia

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The National Archives

In 1987 the National Archives and Records Administration

installed a $3 million camera and computerized system to

monitor the condition of the three documents. The Charters

Monitoring System was designed by the Jet Propulsion Laboratory

to assess the state of preservation of the Constitution,

the Declaration of Independence, and the Bill of Rights.

It can detect any changes in readability due to ink flaking,

off-setting of ink to glass, changes in document dimensions,

and ink fading. The system is capable of recording in very

fine detail 1-inch square areas of documents and later retaking

the pictures in exactly the same places and under the

same conditions of lighting and charge-coupled device

(CCD) sensitivity. (The CCD measures reflectivity.) Periodic

measurements are compared to the baseline image to determine

if changes or deterioration invisible to the human

eye have taken place.

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