Ih'.IXS.m.tMIC A'. //>/<) TEl.l-.niOM. IK.IXSMISSIOS M6 



SiiiNAi. FiKi.i) Sthi;ni;tu 



riu- riirvts tif Fij;. o arc given as examplos of the field strength 

 measurements nivcring a single day's run. The curves iiavc been 

 eonslructed by ronnecling with straight lines the datum points of 

 measurenients taken at hourly intervals. Ii will be evident lli.it 



SC'TCMCR 192} 



G.4.T 

 C.S.t 



Fig. 6 — Monthly average of diurnal variation In signal field transmission from 



.American stations on various frequencies received at New Southgate, England, 



September, 1923 



they portray the major fluctuations occurring throughout the tlay, but 

 that they are not sufficiently continuous to disclose, in detail, the 

 intermediate rtuctuations to which the transmission is subject. 



Diurnal Variation. The left-hand curve is for transmission from 

 Kngland to America on .52 kilocycles, and the right-hand one for 

 transmission from .America to Fngland on .")7 kilocycles. These curves 

 illustrate the fact, which further data substantiate, that both trans- 

 missions are subject to substantially the same diurnal variation. The 



