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Страница 279
Three miles above the ground black - out may occur , and additional breathing oxygen becomes necessary , for the air has already lost half its concentration . It has fallen to one - fifth at 71⁄2 miles . Journeys to the moon were ...
Three miles above the ground black - out may occur , and additional breathing oxygen becomes necessary , for the air has already lost half its concentration . It has fallen to one - fifth at 71⁄2 miles . Journeys to the moon were ...
Страница 281
At a height of 20,000 feet the two systems approach equality when the speed is 500 miles per hour . At 40,000 feet the aeroplane is out of its element . Thereafter the jet - propelled ether - plane shares the heavens with the celestial ...
At a height of 20,000 feet the two systems approach equality when the speed is 500 miles per hour . At 40,000 feet the aeroplane is out of its element . Thereafter the jet - propelled ether - plane shares the heavens with the celestial ...
Страница 283
By means of the jets the eastward speed of about 1000 miles per hour retained from the earth might first be annulled . It would then be driven outwards within the margin of the shadow . Five days at an average speed of 2000 miles an ...
By means of the jets the eastward speed of about 1000 miles per hour retained from the earth might first be annulled . It would then be driven outwards within the margin of the shadow . Five days at an average speed of 2000 miles an ...
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