Nature, Volume 108Sir Norman Lockyer Macmillan Journals Limited, 1921 |
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Página 124
... known , we can calculate its transverse speed in kilometres a second from its proper motion in seconds of arc per century , and we can determine its absolute brightness from its apparent bright- ness . For binary stars at known ...
... known , we can calculate its transverse speed in kilometres a second from its proper motion in seconds of arc per century , and we can determine its absolute brightness from its apparent bright- ness . For binary stars at known ...
Página 139
... known firm of Schimmel and Co. , of Miltitz , near Leipzig , who are among the leading manufacturers of these pro- ducts , and have contributed largely to our knowledge of their chemistry by the systematic investigations which they have ...
... known firm of Schimmel and Co. , of Miltitz , near Leipzig , who are among the leading manufacturers of these pro- ducts , and have contributed largely to our knowledge of their chemistry by the systematic investigations which they have ...
Página 152
... known with certainty to breed locally . Probably one of the most valuable results of the expedition will prove to be the additional light thrown on the breeding ranges of many northern forms . For example , in Koenig's great work only ...
... known with certainty to breed locally . Probably one of the most valuable results of the expedition will prove to be the additional light thrown on the breeding ranges of many northern forms . For example , in Koenig's great work only ...
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BarrettHamilton and M A C Hinton | 21 |
42s | 266 |
ROYAL AERONAUTICAL SOCIETY at Royal Society of Arts at 5 30 | 296 |
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