The National Geographic Magazine, Volume 91National Geographic Society, 1947 - Geography Indexes kept up to date with supplements. |
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Page xxxiii
... Telephone . First , Duplicate of . Testing , in soundproof room : Bell Telephone Laboratories . 616 pages 346-348 ; x , page 350 782 ; color plate 1 , page 787 Thimble , Steel , Padlermiut ( Eskimo ) woman uses . . ill . Third Army ...
... Telephone . First , Duplicate of . Testing , in soundproof room : Bell Telephone Laboratories . 616 pages 346-348 ; x , page 350 782 ; color plate 1 , page 787 Thimble , Steel , Padlermiut ( Eskimo ) woman uses . . ill . Third Army ...
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
Sponge Fishermen of Tarpon Springs Florida By Jennie E Harris | 119 |
Hunting Folk Songs in the Hebrides By Margaret Shaw Campbell | 249 |
Become a Bakhtiari By Paul Edward Case | 325 |
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