DURING the past quarter of a century, a prodigious advance has taken place in the development and application of devices utilizing free electrons, either alone or in association with positive ions, including the wide variety of radio valves, gas-filled rectifiers and cathode ray tubes, as used nowadays in communication and electrical engineering. Technical progress in this subject has hitherto been recorded as an important and ever-growing side-line in journals otherwise devoted mainly to radio communication and television, or to electrical engineering in general. As from the June issue, the Hulton Press, Ltd., has incorporated its previous monthly publication entitled Electronics, Television and Short-Wave World in a new periodical named Electronic Engineering, which is to be of such a scope as to cover the whole field of research and application of electronic devices in general.