The National Geographic Magazine, Volume 91National Geographic Society, 1947 - Geography Indexes kept up to date with supplements. |
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Page 422
... steel springs in its fuselage , engines , and armament , the nose guns being almost literally chains of steel springs ... steel . The word is merely a general term ; the name is not used to denote a definite product . It is a class name ...
... steel springs in its fuselage , engines , and armament , the nose guns being almost literally chains of steel springs ... steel . The word is merely a general term ; the name is not used to denote a definite product . It is a class name ...
Page 435
... steel available in the commercial quantities needed in modern life . The Bessemer process , together with the even more productive open - hearth process , which came after the Civil War , ended the Iron Age and ushered in the Steel Age ...
... steel available in the commercial quantities needed in modern life . The Bessemer process , together with the even more productive open - hearth process , which came after the Civil War , ended the Iron Age and ushered in the Steel Age ...
Page 451
... steel weighs practically the same , except for insignificant differences due to different alloys used . What is meant by lightweight steel is usually some form of alloy steel which , because of its ... steels Steel : Master of Them All 451.
... steel weighs practically the same , except for insignificant differences due to different alloys used . What is meant by lightweight steel is usually some form of alloy steel which , because of its ... steels Steel : Master of Them All 451.
Contents
Hunting Folk Songs in the Hebrides By Margaret Shaw Campbell | 249 |
Become a Bakhtiari By Paul Edward Case | 325 |
In Manchuria Now By W Robert Moore | 389 |
Copyright | |
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