The National Geographic Magazine, Volume 97National Geographic Society, 1950 - Geography Indexes kept up to date with supplements. |
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Page 232
... Ground However , on the surface we found a num- ber of pieces of broken pottery , showing that these elevations had been utilized by the ancient Indians , probably as places of refuge during the rainy season when most of the flat ground ...
... Ground However , on the surface we found a num- ber of pieces of broken pottery , showing that these elevations had been utilized by the ancient Indians , probably as places of refuge during the rainy season when most of the flat ground ...
Page 813
... ground and cloud try desperately to come together , but the air between them prevents this at first , because air is not a good con- ductor of electricity . As the charge in the earth moves along , it swarms up trees , build- ings ...
... ground and cloud try desperately to come together , but the air between them prevents this at first , because air is not a good con- ductor of electricity . As the charge in the earth moves along , it swarms up trees , build- ings ...
Page 827
... ground . The normal amount of voltage , or electrical pressure , on the line cannot open the " safety valve " to get to the ground . But if lightning strikes the line , the voltage is vastly increased . This opens the valve , and the ...
... ground . The normal amount of voltage , or electrical pressure , on the line cannot open the " safety valve " to get to the ground . But if lightning strikes the line , the voltage is vastly increased . This opens the valve , and the ...
Contents
Arizona Sheep Trek By Francis R Line With 16 illustrations in color from natural | iv |
From Indian Canoes to Submarines at Key West Florida By Frederick Simpich With | xii |
Kunming Pilgrimage 20 illustrations from photographs by John Gutmann and Joseph | xix |
Copyright | |
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