The National Geographic Magazine, Volume 91National Geographic Society, 1947 - Geography Indexes kept up to date with supplements. |
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Page 275
... telephone system but many other useful things not connected directly with the telephone . Among them are many phases of radio broadcasting , talking movies , and public- address systems . Out of telephone research , too , came the ...
... telephone system but many other useful things not connected directly with the telephone . Among them are many phases of radio broadcasting , talking movies , and public- address systems . Out of telephone research , too , came the ...
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 ...
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