The National Geographic Magazine, Volume 100National Geographic Society, 1951 - Geography Indexes kept up to date with supplements. |
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Page 641
... light , this strained network of atoms vibrates and gives off visible light , causing the specimens to glow like hot coals . Many minerals which are ordinarily dull and drab looking are transformed by fluores- cence into dazzling ...
... light , this strained network of atoms vibrates and gives off visible light , causing the specimens to glow like hot coals . Many minerals which are ordinarily dull and drab looking are transformed by fluores- cence into dazzling ...
Page 759
... light emitted by atoms of a new kind of man - made mercury . Its chem- ical name is mercury 198. All light moves in waves , like waves in water , and wavelength is the distance between the crests of two waves . The wavelength of the green ...
... light emitted by atoms of a new kind of man - made mercury . Its chem- ical name is mercury 198. All light moves in waves , like waves in water , and wavelength is the distance between the crests of two waves . The wavelength of the green ...
Page 765
... Lights When the sphere is closed , light from the sample lamp inside is diffused equally over the interior . Light coming from one small hole gives an accurate measure of the lamp's total output and helps set electric light standards ...
... Lights When the sphere is closed , light from the sample lamp inside is diffused equally over the interior . Light coming from one small hole gives an accurate measure of the lamp's total output and helps set electric light standards ...
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