The National Geographic Magazine, Volume 113National Geographic Society, 1958 - Geography Indexes kept up to date with supplements. |
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Page 570
A diamond will cut any other substance ; it Earth's Masterpiece Is Ordinary Carbon remains unaffected by the strongest acids . What is this spectacular substance , which Yet heat a diamond hot enough in the prescan be worth $ 2,000,000 ...
A diamond will cut any other substance ; it Earth's Masterpiece Is Ordinary Carbon remains unaffected by the strongest acids . What is this spectacular substance , which Yet heat a diamond hot enough in the prescan be worth $ 2,000,000 ...
Page 572
The ore , inThe final giant pendant , potentially more cluding the hidden diamond , had fallen into valuable than the ... affinity for ished stone would surely join the world's great grease that mine diamonds possess , gleaming gems .
The ore , inThe final giant pendant , potentially more cluding the hidden diamond , had fallen into valuable than the ... affinity for ished stone would surely join the world's great grease that mine diamonds possess , gleaming gems .
Page 585
In ordinary bronze , the hardest steel edge can cut a groove five miles long before needing to be sharpened , and a tungsten - carbide tool remains sharp for 21 miles , but a diamond will make a cut 1,200 miles long .
In ordinary bronze , the hardest steel edge can cut a groove five miles long before needing to be sharpened , and a tungsten - carbide tool remains sharp for 21 miles , but a diamond will make a cut 1,200 miles long .
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