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Subject: Works on Paper in the Tropics

Works on Paper in the Tropics

From: Pat Gallagher <drrust>
Date: Monday, March 16, 1998
In regard to whether a change in atmospheric pressure could break a
glass case, a big differential in atmospheric pressure, say from
29.80 feet to 30.20 feet would produce a pressure of about 0.25 psi
on glass, or over 300 lbs on a 3-ft x 3-ft light.

In considering the force of atmospheric pressure it is helpful to
remember that the average atmospheric pressure at sea level is equal
to the pressure of a stack of steel four feet high.  That's why
vacuum bagging is such an effective way to apply pressure when
bonding or consolidating items.

P. Gallagher
Materials Preservation
Patrick Gallagher

                  Conservation DistList Instance 11:78
                 Distributed: Thursday, March 19, 1998
                       Message Id: cdl-11-78-001
Received on Monday, 16 March, 1998

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