The National Geographic Magazine, Volume 106National Geographic Society, 1954 - Geography Indexes kept up to date with supplements. |
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Page 95
95 Inside the television camera , however , the picture is focused not on a film but on a metal plate covered with thousands of tiny dots of a metallic element , cesium . Each of these dots of cesium is photoelectric ; that is , it has ...
95 Inside the television camera , however , the picture is focused not on a film but on a metal plate covered with thousands of tiny dots of a metallic element , cesium . Each of these dots of cesium is photoelectric ; that is , it has ...
Page 104
Your television antenna picks up the broadcast waves and shoots the electrical impulses down into your receiver , where an electronic scanner like the one in the TV camera turns them back into a picture . We have seen how a television ...
Your television antenna picks up the broadcast waves and shoots the electrical impulses down into your receiver , where an electronic scanner like the one in the TV camera turns them back into a picture . We have seen how a television ...
Page 435
Light , acting upon the silver salts , formed latent pictures which Daguerre developed in mercury vapor . ... He had demonstrated that a natural - looking positive picture could be obtained on a sheet of mirrorbright silver .
Light , acting upon the silver salts , formed latent pictures which Daguerre developed in mercury vapor . ... He had demonstrated that a natural - looking positive picture could be obtained on a sheet of mirrorbright silver .
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Contents
Safari from Congo to Cairo By Elsie May Bell Grosvenor With 39 | v |
New National Geographic Map Depicts Northern Africa and the Mediter | vii |
Lured by the Grandeur of Distant Peaks Four | xii |
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