Anderson at Harvard in 1937, the toothed wheel was replaced by a modulated Kerr cell, and the frequency varied in the one case from 3 to 7 megacycles per second, and in the other case from 7 to 56 ...

at 9 o'clock The broadcast will be one 6.04 megacycles and 11.73 megacycles. Subsequent programs in the Harvard series this month will be: February 11, two plays by the Radio Workshop; February 18 ...