The National Geographic Magazine, Volume 115National Geographic Society, 1959 - Geography Indexes kept up to date with supplements. |
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Page 1
... feet . She I had slowed Nautilus to 10 knots . measures 50 feet from keel to the top of her " sail , " the streamlined tower housing peri- scopes and antennas . Therefore , at this shallow depth , we had only 80 feet of water for ...
... feet . She I had slowed Nautilus to 10 knots . measures 50 feet from keel to the top of her " sail , " the streamlined tower housing peri- scopes and antennas . Therefore , at this shallow depth , we had only 80 feet of water for ...
Page 118
... feet . Here , more than 50 feet into the tunnel , the floor ran nearly level . Our gauges were cali- brated for sea water , which is denser than fresh water by 21⁄2 percent , so that the actual depth was nearer 144 feet . We remained at ...
... feet . Here , more than 50 feet into the tunnel , the floor ran nearly level . Our gauges were cali- brated for sea water , which is denser than fresh water by 21⁄2 percent , so that the actual depth was nearer 144 feet . We remained at ...
Page 311
... feet of hard crystal ice on the surface , as much as 30 feet of loose pack underneath . Rocking Water Breaks Ice Jam Frank Matejka , project manager for the U. S. power engineers , had an idea . In prin- ciple , it was the same as ...
... feet of hard crystal ice on the surface , as much as 30 feet of loose pack underneath . Rocking Water Breaks Ice Jam Frank Matejka , project manager for the U. S. power engineers , had an idea . In prin- ciple , it was the same as ...
Contents
A TROPICAL BIT OF FRANCE 255 | vi |
FIRST CROSSINGS OF THE ENDS OF THE EARTH | 1 |
THE ARCTIC AS A SEA ROUTE OF THE FUTURE | 21 |
Copyright | |
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