Nature, Količina 108Sir Norman Lockyer Macmillan Journals Limited, 1921 |
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Stran 217
... lead now present in uranium minerals enables the time when disintegration commenced to be specified , for the lead in the rocks in question proves to be not ordinary lead but wholly that isotope of atomic weight 206 which is necessarily ...
... lead now present in uranium minerals enables the time when disintegration commenced to be specified , for the lead in the rocks in question proves to be not ordinary lead but wholly that isotope of atomic weight 206 which is necessarily ...
Stran 280
... lead - that is , an element chemically indistinguishable from lead , except by a slight difference of atomic weight and ( practically at least ) inseparable from ordinary lead by chemical means if once mixed with it . The isotope of lead ...
... lead - that is , an element chemically indistinguishable from lead , except by a slight difference of atomic weight and ( practically at least ) inseparable from ordinary lead by chemical means if once mixed with it . The isotope of lead ...
Stran 307
... lead on the longer wave - length side . Data on lead have been previously given by Hull and Rice ( Phys . Rev. , vol . 8 , P. 326 , 1916 ) , who have also determined one point on the shorter wave - length side . The values of Richt ...
... lead on the longer wave - length side . Data on lead have been previously given by Hull and Rice ( Phys . Rev. , vol . 8 , P. 326 , 1916 ) , who have also determined one point on the shorter wave - length side . The values of Richt ...
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BarrettHamilton and M A C Hinton | 21 |
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ROYAL AERONAUTICAL SOCIETY at Royal Society of Arts at 5 30 | 296 |
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