Abstract :
Bearing observations have been made with an Adcock direction-finder on distant transmitters in the 3¿4 Mc/s range, and the auto-correlation function of their time variation has been calculated. Curves of the form ¿¿¿/¿0 have been fitted to the functions obtained, the resulting values of ¿0 having a mean of 0.81 sec. The results differ from these in the 6¿20 Mc/s band in that the standard deviation in a group of observations is not correlated significantly with the value of ¿0.
