Experiments in Recording Radio Signal Intensity

The paper describes briefly the method of recording the strength of long-wave radio signals used at the Bureau of Standards and gives some of the results obtained. The curves shown indicate the great variability of the wave propagation both in regard to strength and the angle of incidence of the downcomning wave. This variability appears to be greater for transmission distances below 1000 km than for greater distances. An apparent connection is shown in certain cases between the night signal variations and magnetic storms. The observations seem to indicate that the downcoming waves are reflected (or refracted) from rapidly changing masses of ionized gas.