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Although the first American on his way to the moon may lack many of the comforts of home, the air he breathes will probably be an earthlike mixture of four parts nitrogen to one of oxygen, in sharp contrast to the pure oxygen atmosphere used in the six Project Mercury capsules.
This was revealed during sessions of the American Association for the Advancement of Science, Dec 26-30 in Cleveland, when Vincent C. Deliberato, a General Electric space engineer, revealed specifications for a series of capsules to be used for six unmanned orbits at three-month intervals beginning late in 1965.
One of the major specifications for the vehicles is a two-gas atmosphere consisting of 18 to 22% oxygen and the remainder nitrogen, at a pressure of 14.7 pounds per square foot ± 10%. Various forms of living matter, ranging from single-cell organisms to primates, will be put in orbit for periods
Biosatellite Space-Probes To Carry Monkeys, Microbes. JAMA. 1964;187(4):37–39. doi:10.1001/jama.1964.03060170085041
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