The National Geographic Magazine, Volume 91National Geographic Society, 1947 - Geography Indexes kept up to date with supplements. |
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Page xxxiii
... Telephone Birthplace of Telephone Magic . 20 ills . in color from natural - color photographs by Willard R. Culver . Mar 289-312 Tiles , Decorated roof : Mexico .... 142 , 143 ; ill . 172 ; 843 color plate VII , page 151 Thimble , Steel ...
... Telephone Birthplace of Telephone Magic . 20 ills . in color from natural - color photographs by Willard R. Culver . Mar 289-312 Tiles , Decorated roof : Mexico .... 142 , 143 ; ill . 172 ; 843 color plate VII , page 151 Thimble , Steel ...
Page 297
... telephone tended to reduce naturalness , and so we try to strike a happy medium . The human voice ranges over about five or six octaves , but not more than about four octaves need to be trans- mitted over the telephone for good hearing ...
... telephone tended to reduce naturalness , and so we try to strike a happy medium . The human voice ranges over about five or six octaves , but not more than about four octaves need to be trans- mitted over the telephone for good hearing ...
Page 301
... Telephone Laboratories studied by Bell men . They are experiment- ing with very short electric waves vibrating billions of times per second . Such waves won't stay on wires . They must either be shot off into space as radio waves or ...
... Telephone Laboratories studied by Bell men . They are experiment- ing with very short electric waves vibrating billions of times per second . Such waves won't stay on wires . They must either be shot off into space as radio waves or ...
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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