OVERSEAS RADIO EXTENSION 



257 



U. S. A. Within this period, there was a magnetic storm. No data 

 were obtained on June 29. The original curves were obtained with 

 an automatic recorder, receiving from station GBU of the British 

 General Post Office during regular operation. In redrafting for pub- 



Fig. 9 — -Magnetic storm effect, oscillograms of received carrier. 



lication, the rapid variations which are characteristic of fading have 

 been eliminated and only the slow drifts are shown. It will be seen 

 that the effect of the storm became evident on June 26, the average 

 signal being 15 to 20 db lower than the preceding day. This condition 

 continued on the 27th and 28th, on the 30th the signal averaged a little 

 higher, and on July 1 a recovery had set in. The incompleteness of 



