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Sound Made To Travel In Just One Direction By Researchers
Sound spreads both forwards and backward in a space, meaning someone standing ... for the same to be done with ...
Nature17d
The Propagation of Radio Waves over the Earth
THE modified form of the ionic deflexion theory of wave propagation, discussed by Messrs. Nichols and Schelling (NATURE, March 7, vol. 115, p. 334), appears to have been suggested in England and ...