Kennelly-Heaviside Layer Height Observations for 4045 kc and 8650 kc

Virtual heights of the Kennelly-Heaviside layer as measured by the radio echo method are reported for 4045 kc and 8650 kc. The report covers daytime observations made each week between January 16 and June 19, 1930. Two evening tests are also described. Curves are given comparing heights with sun spot numbers and magnetic character. Records taken on April 28, 1930, the day of the solar eclipse, are shown.