A first course in wireless : being a reprint in book form of a series of articles which appeared in World radio under the title "The Radio circle: for beginners only," / by Decibel. Decibel. Radio. TK6550 .D28 1942 621.384 DEF Includes index. London : Sir I. Pitman & Sons, c1945. c1945. 1942 Text vii, 221 p. : eng