The National Geographic Magazine, Volume 81National Geographic Society, 1942 - Geography Indexes kept up to date with supplements. |
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Page 459
... Metals Will Float Asked to name all the known metals in the world , few of us could give more than twenty . Yet the total list is more than three times that long - some seventy kinds of metal . Of these about thirty are useful today ...
... Metals Will Float Asked to name all the known metals in the world , few of us could give more than twenty . Yet the total list is more than three times that long - some seventy kinds of metal . Of these about thirty are useful today ...
Page 463
... metal rolls right off . In this airplane factory the liquid alloy is poured into a stoppered length of tubing , which is then cooled with water . The metal solidifies and keeps the tube from collapsing during bend- ing . It also shows ...
... metal rolls right off . In this airplane factory the liquid alloy is poured into a stoppered length of tubing , which is then cooled with water . The metal solidifies and keeps the tube from collapsing during bend- ing . It also shows ...
Page 484
... metal is a natural alloy of nickel and copper , which occur together in Canada's Sud- bury mines . Stubborn nickel , hard to extract from its ore , made early German miners fume . They ex- pected copper , and the pallid metal they got ...
... metal is a natural alloy of nickel and copper , which occur together in Canada's Sud- bury mines . Stubborn nickel , hard to extract from its ore , made early German miners fume . They ex- pected copper , and the pallid metal they got ...
Contents
Facts about the Philippines By FREDERICK SIMPICH | 185 |
Two Young Children and Their Parents Live Off | 589 |
French West Africa in Wartime By PAUL M ATKINS 371 | 623 |
Copyright | |
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