IN radio reception, a knowledge of the angle of incidence at the ground of short waves returned from the ionosphere is important. The accurate design of antenna arrays for radio communication by ...

Minnesota photographer Craig Blacklock makes waves with abstract ... 100 days circumnavigating the 31,700-square-mile lake in a kayak to photograph it from every rocky-beach and bare-cliff angle.

AN important problem in short wave propagation from both the purely scientific and the commercial aspect concerns the angle of elevation of the path of the ray both at the transmitting and ...