Science and Life: Aberdeen AddressesJ. Murray, 1920 - 229 páginas |
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Página 99
... spectroscopic test for helium is very sensitive , a bubble of the gas , both of a cubic millimetre in volume , that is , both part of a large pin's head , being sufficient to give the characteristic spectrum . This was in 1903 , at the ...
... spectroscopic test for helium is very sensitive , a bubble of the gas , both of a cubic millimetre in volume , that is , both part of a large pin's head , being sufficient to give the characteristic spectrum . This was in 1903 , at the ...
Página 117
... spectroscopic methods . The disintegration of the single atom is ascertainable , for example , in the spinthariscope of Sir William Crookes , where each R of the scintillations separately visible is due to the impact.
... spectroscopic methods . The disintegration of the single atom is ascertainable , for example , in the spinthariscope of Sir William Crookes , where each R of the scintillations separately visible is due to the impact.
Página 120
... spectroscopic proof of the production of helium from radium by Sir William Ramsay and myself , and later from actinium , polonium , and even from uranium and thorium , all at the rates to be expected from radioactive data . The ...
... spectroscopic proof of the production of helium from radium by Sir William Ramsay and myself , and later from actinium , polonium , and even from uranium and thorium , all at the rates to be expected from radioactive data . The ...
Página 128
... spectroscopic character . The new members resembled known elements in chemical character so closely that they could not be separated from them by chemical analysis , although sharply differentiated from them by the radioactive ...
... spectroscopic character . The new members resembled known elements in chemical character so closely that they could not be separated from them by chemical analysis , although sharply differentiated from them by the radioactive ...
Página 135
... spectroscopic examination . Of these three , polonium , although the element of which at present the chemistry is best known , is likely to remain the most difficult to bring into line with the others , for , although a vast amount of ...
... spectroscopic examination . Of these three , polonium , although the element of which at present the chemistry is best known , is likely to remain the most difficult to bring into line with the others , for , although a vast amount of ...
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a-particle actinium active ancient animal atomic number atomic weight B-ray bismuth branch British Science Guild Carnegie Trust cent century chemical character chemical elements chemist chemistry classical coal commercial education complete conception creative definite direct discovery disintegration electricity electrons emanation energy evolved existence expelled experimental external Faculty FREDERICK SODDY fundamental H. H. Asquith helium hitherto human ideals important inanimate universe investigation ionium isotopes J. J. Thomson knowledge known labour lead living material means mechanism ment million mind minerals modern nation nature original past Periodic Law periodic table philosophy physical pitchblende polonium practical present problem processes Professor progress pure quantity radio-elements radioactive change radium recognised regard religion scientific study Scotland Soddy spectroscopic spectrum spirit study and research subjects successive teaching technical or commercial thallium thought tion to-day transmutation truth ultimate University of Aberdeen uranium and thorium wealth whole