AMONG the facts to be explained in a satisfactory theory of the propagation of radio waves over the earth's surface are the curvature of the rays in transmission between stations far apart ...

Their study revealed that coherence entropy remains stable during the propagation of light through a unitary system, even when faced with complex and deformed optical environments. This ...

The new system attempts to solve the problem of regulating light transmission to allow clear ... The practical applicability of previous unidirectional wave transmission solutions has been limited ...

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 ...