The New Encyclopaedia Britannica, Volume 23Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 139
... possible to send a great number of simultaneous tele- phone conversations over a single channel of long - distance lines , microwave radio systems , or submarine cables , since it separates each voice channel from all others and thus ...
... possible to send a great number of simultaneous tele- phone conversations over a single channel of long - distance lines , microwave radio systems , or submarine cables , since it separates each voice channel from all others and thus ...
Page 194
... possible to float copper , lead , and zinc minerals selectively from each other by preventing the flotation of all minerals except those containing lead , then floating only the copper minerals , and finally only the zinc minerals ...
... possible to float copper , lead , and zinc minerals selectively from each other by preventing the flotation of all minerals except those containing lead , then floating only the copper minerals , and finally only the zinc minerals ...
Page 195
... possible ( 1864 ; " What Is Possible " ) , and Science de l'homme ( 1865 ; " Science of Man " ) . In 1867 he was denied a professorship at the Collège de France because of his attachment to radical scientific and political doctrines ...
... possible ( 1864 ; " What Is Possible " ) , and Science de l'homme ( 1865 ; " Science of Man " ) . In 1867 he was denied a professorship at the Collège de France because of his attachment to radical scientific and political doctrines ...
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