The New Encyclopaedia Britannica, Volume 23Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 112
... radio pioneer who broadcast the first program of music and voice ever trans- mitted . After study at Trinity College ... radio was the heterodyne principle , in which the incoming radio fre- quency is converted to an intermediate fre ...
... radio pioneer who broadcast the first program of music and voice ever trans- mitted . After study at Trinity College ... radio was the heterodyne principle , in which the incoming radio fre- quency is converted to an intermediate fre ...
Page 381
... radio observations ; optical observations are prevented by inter- vening clouds of dark matter . The centre of the Galaxy lies probably 20,000 to 30,000 light - years ( about 1.9 to 2.9 x 1017 ki- lometres ) from Earth , in the ...
... radio observations ; optical observations are prevented by inter- vening clouds of dark matter . The centre of the Galaxy lies probably 20,000 to 30,000 light - years ( about 1.9 to 2.9 x 1017 ki- lometres ) from Earth , in the ...
Page 384
... radio emissions and hydrogen content 15 : 474c galaxy , Seyfert , one of a class comprising about 2 percent of spiral galaxies , character- ized by intensely bright central nuclei and strong radiation at radio and infrared wave- lengths ...
... radio emissions and hydrogen content 15 : 474c galaxy , Seyfert , one of a class comprising about 2 percent of spiral galaxies , character- ized by intensely bright central nuclei and strong radiation at radio and infrared wave- lengths ...
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