The National Geographic Magazine, Volume 106National Geographic Society, 1954 - Geography Indexes kept up to date with supplements. |
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Page 180
... Light Most Norwegian lighthouses now use electricity instead of gas - lit Dalen burn- ers like this . Powerful prisms in the huge rotating Fresnel lens concentrate light from the mantle ( upper center ) and beam it seaward . As highly ...
... Light Most Norwegian lighthouses now use electricity instead of gas - lit Dalen burn- ers like this . Powerful prisms in the huge rotating Fresnel lens concentrate light from the mantle ( upper center ) and beam it seaward . As highly ...
Page 426
... light - sensitive silver salt that captures photographic images . The plates had to be exposed while still wet and ... light . Prede- cessors of Daguerre had obtained crude images on paper coated with silver nitrate . In these " pictures ...
... light - sensitive silver salt that captures photographic images . The plates had to be exposed while still wet and ... light . Prede- cessors of Daguerre had obtained crude images on paper coated with silver nitrate . In these " pictures ...
Page 427
... Light re- flected from the shirt reversed light and dark tones in the picture . This daguerreotype illustrates the effect . Black velvet ( lower left ) and white card- board lie at bottom . One woman looks natural because her image is ...
... Light re- flected from the shirt reversed light and dark tones in the picture . This daguerreotype illustrates the effect . Black velvet ( lower left ) and white card- board lie at bottom . One woman looks natural because her image is ...
Contents
President Eisenhower Presents 64 | 57 |
To the Depths of the Sea by Bathyscaphe 67 | 57 |
Two and a Half Miles Down 80 | 57 |
Copyright | |
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