4th July Independence Day
4th July Independence Day. RDM magazine and multimedia
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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