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Magna Carta Getting a New Gas to Lie In

The Magna Carta helped form the foundation for modern English and U.S. law. Now one of two copies known to exist outside England is headed for a special new case to preserve it.

The very first Magna Carta dates to 1215, when English barons forced King John to write down the traditional rights and liberties of the country's free persons. A copy of the Magna Carta signed by King Edward I in 1297 currently resides within a helium-filled casement at the National Archives Building in Washington. But the medieval document is scheduled for a temporary removal in 2011 so it can be re-measured for a new case filled with argon.

Researchers worried that helium atoms, which are relatively small, could escape from the case holding the Magna Carta, leaving the 713-year-old animal skin parchment susceptible to degradation. Those fears proved unfounded, but the National Archives has chosen to preserve the parchment in another inert gas, argon, whose larger atoms have proven easier to contain....
Read entire article at Live Science