The National Geographic Magazine, Volume 115National Geographic Society, 1959 - Geography Indexes kept up to date with supplements. |
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Page 551
... Helicopter " Aren't helicopters. mapping in seven western States and Hawaii . Lloyd told me of animals chasing copters and vice versa . A copter tried to scare a grizzly bear away from some surveying in- struments ; the bear ran , then ...
... Helicopter " Aren't helicopters. mapping in seven western States and Hawaii . Lloyd told me of animals chasing copters and vice versa . A copter tried to scare a grizzly bear away from some surveying in- struments ; the bear ran , then ...
Page 554
... helicopter . Not until 1878 was a model helicopter actually built . Powered by a small steam engine , it hovered 40 feet above ground for 20 seconds . Enrico Forlanini was the ingenious Italian designer . In the same inventive era ...
... helicopter . Not until 1878 was a model helicopter actually built . Powered by a small steam engine , it hovered 40 feet above ground for 20 seconds . Enrico Forlanini was the ingenious Italian designer . In the same inventive era ...
Page 556
... Helicopters Are Here to Stay I asked if helicopters wouldn't soon be out- moded by flying platforms and tilt - wing planes . Gustafson shook his head . " Many kinds of planes are being built to take off straight up like a helicopter and ...
... Helicopters Are Here to Stay I asked if helicopters wouldn't soon be out- moded by flying platforms and tilt - wing planes . Gustafson shook his head . " Many kinds of planes are being built to take off straight up like a helicopter and ...
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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