Annual Report of the Board of Regents of the Smithsonian InstitutionThe Institution, 1914 |
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Сторінка 179
... certain very characteristic ways . This difference has been investigated by the Mount Wilson Solar Observatory . A photographic map of the sun - spot spectrum as com- pared with the spectrum of the sun's surface has been published by ...
... certain very characteristic ways . This difference has been investigated by the Mount Wilson Solar Observatory . A photographic map of the sun - spot spectrum as com- pared with the spectrum of the sun's surface has been published by ...
Сторінка 399
... certain regions , but the facility of inter- communication tends , however , to render such conditions more and more difficult . The populations of certain of our coast islands ( Ouessant , Brehat ) have for that reason taken on a ...
... certain regions , but the facility of inter- communication tends , however , to render such conditions more and more difficult . The populations of certain of our coast islands ( Ouessant , Brehat ) have for that reason taken on a ...
Сторінка 736
... certain of these difficulties can be explained . First of all , with regard to the mixing of pigments as compared ... certain degree of transparency so that light partly penetrates them , certain rays being then reflected and certain ...
... certain of these difficulties can be explained . First of all , with regard to the mixing of pigments as compared ... certain degree of transparency so that light partly penetrates them , certain rays being then reflected and certain ...
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