Robison's Manual of radio telegraphy and telephony for the use of naval electricians (1918)
Robison, S. S. (Samuel Shelburne), b. 1867, United States Naval Institute, Todd, David Wooster, Hooper, Stanford Caldwell · Annapolis, Md. : The United States Naval Institute · leaf 55
a windy day. The small back waves on thewindward side are reflected to windward. The waves circling or bend-ing around the rock are diffracted. The still water in the lee of the rockis the shadow, in which no action exists. At a distance depending onthe size of the rock and the wave length the… … For the above reasons, high land between two wireless telegraphstations has the effect of decreasing the strength of signals at eachstation, and, if close to either station, may entirely prevent that stationfrom receiving. (It may be in the shadow or be subject to interferencefrom reflection.) The…
