Radio Echoes and Conditions for their Occurrence


SINCE October 24, the emission of signals (see NATURE, NOV. 3 and Dec. 8, 1928) from the shortwave emitter PCJJ (Holland) has been continued twice a week, and sometimes more frequently. Through the Norwegian Telegraph Office a series of receiving stations has maintained a continual watch, and an oscillograph has been ready for use at all times, but no echoes have been heard, either in Norway or in Eindhoven.

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STØRMER, C. Radio Echoes and Conditions for their Occurrence. Nature 123, 16–17 (1929).

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