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Show Electrified Dust From Sun PROFESSOR S. A FLEMING gc the f,f;h Henry Trucman Wood lecture before the Royal Society of Arts in London the other night JH on The Coming of Age of Long-distance Wire-less Wire-less and Some 0f Its Scientific Problems.' It proved, said Dr Flem ng, during the nasi 20 years that the received signals at distances of H 6,000 to 12 000 miles were many thousand-;, oi even millions of times stronger than could be S( counted lor by pure diffraction or bending of H the waves around the earth. It was generally H agreed that long-distance wireless telegraphy . only took place in consequence of the existence ffl of an electrical conducting layer in the earths ll atmosphere. This was present at a height, probably, of 100 to 200 kilometres, and was 1 thought to be due to electrified dust which came il from tho sun The outstanding problem of lons-distance w ireless telegraphy and telephony was the neutralization of the effect of vagrant waves on the receiving apparatus. |