Nature, Volume 108Sir Norman Lockyer Macmillan Journals Limited, 1921 |
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Página 10
... less than about 1/2000 in . They might be made by ruling on thin opaque films , and , so far as opacity is concerned , films of silver or other metals chemically deposited on glass would meet the case ; but the in- trinsic strength of ...
... less than about 1/2000 in . They might be made by ruling on thin opaque films , and , so far as opacity is concerned , films of silver or other metals chemically deposited on glass would meet the case ; but the in- trinsic strength of ...
Página 133
... less than 20 ° , or in the case of any person em- ployed at a distance of 6 ft . or less from the source not less than 30 ° . ( 2 ) . . . " Adequate means shall be taken , either by suitable placing or screening of the light sources ...
... less than 20 ° , or in the case of any person em- ployed at a distance of 6 ft . or less from the source not less than 30 ° . ( 2 ) . . . " Adequate means shall be taken , either by suitable placing or screening of the light sources ...
Página 434
... less than s . , or less than per cent . By slide - rule computing the differential formula with the hour of Table VI . , 2h . 54m . , the hour - angle at end is 43 ° 45 ' , first approximate semi - duration 51.3 ' , final mid - sunset ...
... less than s . , or less than per cent . By slide - rule computing the differential formula with the hour of Table VI . , 2h . 54m . , the hour - angle at end is 43 ° 45 ' , first approximate semi - duration 51.3 ' , final mid - sunset ...
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