Nature, Volume 35Nature Publishing Group, 1886 |
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Página 61
... mile of hazy air its intensity is diminished to la , at two miles its intensity is diminished to la2 , and at a distance of d miles to lad But divergent light , such as is even the most condensed beam from a lighthouse , diminishes also ...
... mile of hazy air its intensity is diminished to la , at two miles its intensity is diminished to la2 , and at a distance of d miles to lad But divergent light , such as is even the most condensed beam from a lighthouse , diminishes also ...
Página 151
... miles vertically over a point of the earth's surface near Farndale , in Yorkshire . Travelling to south west , it evolved an enduring light - streak when 49 miles high , near Thirsk , and disappeared near Otley , at an elevation of 28 miles ...
... miles vertically over a point of the earth's surface near Farndale , in Yorkshire . Travelling to south west , it evolved an enduring light - streak when 49 miles high , near Thirsk , and disappeared near Otley , at an elevation of 28 miles ...
Página 178
... miles , and thus is the shortest of all the routes . Mr. Thomson has traversed this route to within 300 miles of Wadelai , and these 300 miles are as yet unexplored . The most formidable difficulty here would be the belli- cose Masai ...
... miles , and thus is the shortest of all the routes . Mr. Thomson has traversed this route to within 300 miles of Wadelai , and these 300 miles are as yet unexplored . The most formidable difficulty here would be the belli- cose Masai ...
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