Book Review

Radio Record, Volume IV, Issue 39, 10 April 1931, Page 12

Book Review

Wireless Direction-Finding OF recent years the syllabus for the commercial radio operator’s examination has been appreciably extended. The theory and. practice of wireless direction-finding is now of utmost importance. One of the most comprehensive and lucid manuals we have seen’ on this subject is "Wireless Direction-Finding and Directional Reception," by R. Keen. B. Eng, (Hons.), Sheffield, A.M.LD.E. A second: and thoroughly up-to-date edition of this book has now appeared on the market, and for those who intend to make radio their career it is an excellent reference book. The science of wireless directionfinding is traced through from its inception to the present day, and full déscriptions of the commercial systems in use at present are included. -In addition to dealing with the theory of all systems, including frame aerial direc-tion-finders, the book describes in detail the preparation of directional maps and discusses causes and methods of correction of variations in bearings due to night errors. The book may be obtained from the Te Aro Book Depot, Courtenay Place, Wellington, at a price of 26/6,