History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1943 10

3 P.03 - Contents Banner The Australasian Radio World Devoted entirely to Technical Radio and incorporating All-Wave All-World DX News Vol. 8. - OCTOBER, 1943 - No. 5. P.03 - Publication Notes Proprietor - A. G. HULL Technical Editor - J. W. Straede, B.Sc. Short-wave Editor - L. J. Keast Manager - Dudley L. Walter Secretary - Miss E. M. Vincent City Office - 243 Elizabeth St., Sydney - For all correspondence: Phone MA2325 Office Hours - Week-days: 10 a.m. - 5 p.m., Saturdays: 10 a.m. - 12 noon Editorial Office - 117 Reservoir Street, Sydney Subscription Rates - 6 issues 5/3, 12 issues 10/6, 24 issues £1, Post free to any address Service Departments - Back Numbers, 1/- ea., post free; Reply-by-mail Queries, 1/- each Printed by Bridge Printery Pty. Ltd., 117 Reservoir Street, Sydney, N.S.W., for the proprietor of the "Australasian Radio World," 117 Reservoir St., Sydney (Footnote P.28) P.03 - Contents CONTENTS: CONSTRUCTIONAL - Design for a Simple A.C. Bridge . . . . 5 A Receiver Circuit for Utopia . . . . 9 Building a High-Grade Audio Transformer . . . . 15 TECHNICAL - History of the Cathode Ray Oscilloscope . . . . 7 Revivals in Radio Practice . . . . 13 Servicing Suggestions for A.C.-D.C. Sets . . . . 18 SHORTWAVE SECTION - Shortwave Review . . . . 20 Notes and Observations . . . . 21 Allied and Neutral Countries Shortwave Schedules . . . . 23 New Stations . . . . 25 THE SERVICE PAGES - Answers . . . . 26 P.03 - Editorial Notes Editorial Once again the question of Marconi's early work on the development of radio communication has been brought into the limelight. The Supreme Court of the United States has ruled that Marconi did not invent radio and has invalidated the American patents of his, dated 1904. The court's opinion was based largely on the fact John Stone showed a four-circuit that a patent granted in 1902 to wireless telegraph apparatus substantially like that later specified and patented by Marconi. Irrespective of court decisions, however, there is no doubt that Marconi was the practical man who knew how to make the most from the new science. Which brings us to the point we wish to stress; there is a wonderful field of opportunity waiting for the firm or individual who can organise a really effective way of entering the field of electronics. Being so closely allied to radio, it is only natural that we turn to the radio engineers as the most likely men for the job. It has been demonstrated beyond a shadow of doubt that there are remarkable prospects for the commercial application of the photo-electric cell, thyratron, ignitron, kenatron, magnetron and the hundred and one other recently introduced applications of the electron stream. These units can be of great service to industry, yet they lie comparatively dormant, waiting for the right kind of publicity campaign to bring their merit under the notice of those who should be interested in their possibilities as aids to production. There is no need to wait until after the war is over, as they might well be obtained on the lend-lease plan to help in our war effort. P.05 - Constructional - Design for a Simple A.C. Bridge P.07 - Technical - History of the Cathode Ray Oscilloscope P.09 - Constructional - A Receiver Circuit for Utopia P.13 - Technical - Revivals in Radio Practice P.15 - Constructional - Building a High-Grade Audio Transformer P.18 - Technical - Servicing Suggestions for A.C.-D.C. Sets P.20 - Shortwave Section - Shortwave Review P.21 - Shortwave Section - Notes and Observations P.23 - Shortwave Section - Allied and Neutral Countries Shortwave Schedules P.25 - Shortwave Section - New Stations P.26 - The Service Pages - Answers