The National Geographic Magazine, Volume 91National Geographic Society, 1947 - Geography Indexes kept up to date with supplements. |
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Page 422
But research on steel alloys collateral service facilities , such as water , and nonsteel alloys made it possible to go ap- steam , gas , and electricity in a going plant . proximately 500 degrees higher than had been Some secondhand ...
But research on steel alloys collateral service facilities , such as water , and nonsteel alloys made it possible to go ap- steam , gas , and electricity in a going plant . proximately 500 degrees higher than had been Some secondhand ...
Page 435
the same method of making steel at prac- would otherwise be used to make pig iron . tically the same time , when he tried to In this way steel can serve man indefinitely produce malleable iron by blowing air through and can be used over ...
the same method of making steel at prac- would otherwise be used to make pig iron . tically the same time , when he tried to In this way steel can serve man indefinitely produce malleable iron by blowing air through and can be used over ...
Page 451
in New York I held in my hand four small surfaces of railroad trains and for kitchen pieces of steel , all cut from the same sheet equipment . but each hardened by a different treatment . Weight reduction has been a popular The first ...
in New York I held in my hand four small surfaces of railroad trains and for kitchen pieces of steel , all cut from the same sheet equipment . but each hardened by a different treatment . Weight reduction has been a popular The first ...
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Contents
Hunting Folk Songs in the Hebrides By Margaret Shaw Campbell | 249 |
Become a Bakhtiari By Paul Edward Case a | 325 |
In Manchuria Now By W Robert Moore | 389 |
Copyright | |
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