Since the B-29 had been "compromised" (i.e., one or more of them had fallen into enemy hands), the Army could reveal further details of the Superfortress' intricate construction. One of these details was the "pressurized" cabin.
When a military plane is six miles up, the crewmen are usually hampered by cumbersome clothing, by oxygen masks which fasten to stationary valves. Not so in the B29. It has a cabin which provides air near sea-level pressure at the highest ceiling.
The principle is not new. Years ago the Army experimented with air pumped into...
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