Cabin pressure at altitude

Date:         31 Jan 97 14:29:25 
From:         Dale B Rothert <rothertd@1st.net>
Organization: eNET Inc. - Internet Service Provider
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Hello,

I am interested in what the average cabin pressure is in a B-747 or
similar aircraft at crusing altitued. Presumed crusing is in the mid to
upper 30's. It would be helpful in inches of mercury but a ratio of
interior to exterior would serve the purpose.

Thanks.

Dale