The National Geographic Magazine, Volume 72National Geographic Society., 1938 - Geography Indexes kept up to date with supplements. |
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Page 370
... light along a line from upper left to lower right ; and below , a minimum in the hori- zontal direction . This results from absorption , by the polaroid screens , of the light that is polarized , or vibrating in these directions . From ...
... light along a line from upper left to lower right ; and below , a minimum in the hori- zontal direction . This results from absorption , by the polaroid screens , of the light that is polarized , or vibrating in these directions . From ...
Page 372
... light is par- tially polarized . Ordinary light waves vibrate in all directions as does a taut piece of string when it is plucked , but " polarized " light waves vibrate in only one direction , as would the string if it were lying in a ...
... light is par- tially polarized . Ordinary light waves vibrate in all directions as does a taut piece of string when it is plucked , but " polarized " light waves vibrate in only one direction , as would the string if it were lying in a ...
Page 375
... light from the chromosphere , or atmosphere of the sun , just after the advancing moon has covered the main body . The arcs of light tell astrono- mers how high above the sun the vapors of various chemical elements are rising , some of ...
... light from the chromosphere , or atmosphere of the sun , just after the advancing moon has covered the main body . The arcs of light tell astrono- mers how high above the sun the vapors of various chemical elements are rising , some of ...
Contents
Algonquian Indians | 57 |
Soaring Heights of New Hampshire Attract | 73 |
Admiral Byrds Second | 105 |
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