The National Geographic Magazine, Volume 86, Issue 2National Geographic Society, 1944 - Geography |
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Page 512
... tion , January 16 , 1939 , discovered the oldest work of man in the Americas for which we have a date . This slab of stone is engraved in Mayan characters with a date which means November 4 , 291 в . с . ( Spinden Correlation ) . It ...
... tion , January 16 , 1939 , discovered the oldest work of man in the Americas for which we have a date . This slab of stone is engraved in Mayan characters with a date which means November 4 , 291 в . с . ( Spinden Correlation ) . It ...
Page 631
... tion with a sensitive Cooke magnetometer ( page 634 ) . His assistants use an earth inductor ( center ) and another magnetometer ( right ) . Recordings like these , made all over the world , enable mariners to allow for the variation of ...
... tion with a sensitive Cooke magnetometer ( page 634 ) . His assistants use an earth inductor ( center ) and another magnetometer ( right ) . Recordings like these , made all over the world , enable mariners to allow for the variation of ...
Page 636
... tion meter . When engineers built the Golden Gate Bridge at San Francisco , its natural vibrations were measured at various stages of construction , to study the reaction of the bridge to any pos- sible earthquake . Making a Jigsaw ...
... tion meter . When engineers built the Golden Gate Bridge at San Francisco , its natural vibrations were measured at various stages of construction , to study the reaction of the bridge to any pos- sible earthquake . Making a Jigsaw ...
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