The National Geographic Magazine, Volume 115National Geographic Society, 1959 - Geography Indexes kept up to date with supplements. |
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Page 113
... light on the back wall , which curved abruptly down to the toe of the cenote . At the foot of the rocky columns we came to another landing , and then the bottom dipped again , flattened , and slid into a low - arched black tunnel ...
... light on the back wall , which curved abruptly down to the toe of the cenote . At the foot of the rocky columns we came to another landing , and then the bottom dipped again , flattened , and slid into a low - arched black tunnel ...
Page 672
... light , traveling 186,000 miles a second , requires about two million years to reach earth . Its diam- eter measures 100,000 light years . An observer far out in space would see Andromeda and our own Milky Way as sisters - two similar ...
... light , traveling 186,000 miles a second , requires about two million years to reach earth . Its diam- eter measures 100,000 light years . An observer far out in space would see Andromeda and our own Milky Way as sisters - two similar ...
Page 679
... light required nearly 679 five hours of exposure . In such faint light , photographic film works less efficiently than in bright light , and in color film the red- and green - sensitive layers of the emulsion lose much more sensitivity ...
... light required nearly 679 five hours of exposure . In such faint light , photographic film works less efficiently than in bright light , and in color film the red- and green - sensitive layers of the emulsion lose much more sensitivity ...
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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