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WIRELESS WORLD and RADIO REVIEW Ç the OFFICIAL ORGAN of the RADIO SOCIETY of GREAT BRITAIN No

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WIRELESS WORLD and RADIO REVIEW Ç the OFFICIAL ORGAN of the RADIO SOCIETY of GREAT BRITAIN No THE WIRELESS WORLD AND RADIO REVIEW Ç THE OFFICIAL ORGAN OF THE RADIO SOCIETY OF GREAT BRITAIN No. 212. No. z3 Vol. XII.) SEPTEMBER 5th, 1923. WEEKLY EDITOR : HUGH S. POCOCK. RESEARCH EDITOR: ASSISTANT EDITOR: PHILIP R. COURSEY, B.Sc., F.Insi.P., A.M.I.E.E. F. H. HAYNES. g QUESTIONS AND ANSWERS DEPARTMENT : Under the Supervision of W. JAMES. CONTENTS PAGE Pk Editorial - - - - - - 752 Receiver Design. By F. H. Haynes - - - 753 Pk A Low -Voltage Cathode Ray Oscillograph. By N. V. Kipping - - 759 Drills and Drilling. By Richard Twelvetrees - 763 Pr Wireless Club Reports - - - - - 766 Wireless Theory- (XXIII) - - - - - 767 Hints for Better Reception. By W. James - - - 771 Correspondence - - - - - - - 774 Notes and News - - 776 Some Experiments Illustrating the Elect- rical Properties of Neon Lamps (Discussion). By Philip R. Coursey 778 Question and Answers - - - - 78o HE EDITOR will be glad to consider articles and illustrations dealing with subjects within the scope of the ,journal. Illustrations should preferably be confined to photographs and rough drawings. The greatest care will be taken to return all illustrations and manuscripts not required for publication if these are accompanied by stamps to pay return postage. All manuscripts and illustrations are sent at the Author.'s risk and the Editor cannot accept responsibility for their safe custody or return. Contributions i should be addressed to the Editor, " The Wireless World and Radio Review," 12 ànd 13, Henrietta Street, Strand, London, W.C.2. SUBSCRIPTION RATES : 20s. per annum, post free. Single Copies 4d. each or post free 5d. .,Registered at the G.P.O. for transmission by Magazine Post to Canada and Newfoundland. EDITORIAL AND PUBLISHING ADVERTISEMENT MANAGERS OFFICES : 12 and 13 Henrietta Street. Strand, Bertram Day and Co.. Ltd., London. W.C.2. 9 and 10 Charing Cross, S. W.1 2807-8. Telephone: Gerrard Telephone : Gerrard 8063 -4. gZe-$-XZgg*g$1.$:g$gZggZggZ:Ze B www.americanradiohistory.com 752 THE WIRELESS WORLD AND RADIO REVIEW SEPTEMBER 5, 19 The Broadcasting Committee's Report. F TER a delay which has seemed almost interminable, we have at last s . definite news of the progress of the Report of the Postmaster-Gener Broadcasting Committee. At least we know now that the Report has drawn up and submitted to the Postmaster -General. We are further promi that it will shortly be made public, and the full text published as a Government pape There is no doubt whatever that this document will make extremely interesting readi and will set out all the problems arising out of broadcasting, with the special advant . of the assurance that each problem will have been treated after having heard evide from all interested parties. Thus far we may confidently look forward to a very interest document, but yet we are inclined to believe that little will have been done to render task of the Postmaster -General any easier in the matter of deciding upon a policy in reg . to broadcasting and the problem of licences. At the best, the Committee's report can be more than a review of the existing difficulties which have arisen as a result of introduction of broadcasting, and recommendations made with a view to assisting t difficult task which will still devolve upon the Postmaster-General--that of making a decisions with regard to the future of this new wireless service. It would appear, then, that we must not be too sanguine of any immediate results fr. the Broadcasting Committee's Report. The very fact that this report has taken so long compile, and that it was hinted at one time that a minority report would also be present goes to show how difficult a matter it has been to bring forward any recommendations all which could bring together with any sort of harmony the many conflicting interests a parties concerned. When the time comes that the Postmaster -General is in a position to announce policy and give decisions regarding the future conduct - of broadcasting, and the issuing licences, it is to be sincerely hoped that all vestige of doubt and uncertainty will be remove and that the decisions (whatever they may be) will be definite and lasting, with no weak poin left which will require recommendation at a later date. The service of broadcasting, and the industry which depends upon it, not to mentii the amateur situation, have already suffered sufficiently on account of the hopele uncertainty which developed almost from the moment broadcasting was introduced. The Artificial Aerial. Not infrequently the persistent applicant for a transmitting licence has his efforts rewarde by the award to him of authority to use his transmitting apparatus with an artificial aeria We continually ieceive letters of indignation from experimenters who have secured suc facilities enquiring-as to the extent to which their licence limits them. Such querists ar of course, recommended to apply to the authority awarding the licence, though, in of opinion, the use of an artificial aerial implies that the experimenter must use a non- radiatir, system. With the use of an artificial aerial the experimenter can learn a good deal with regal to transmitting apparatus, as in very few instances is it necessary to radiate in order 10- carry out investigations in the circuit principles of transmitting apparatus, and even thosb experimenters who have full facilities with regard to transmission, could easily make us. of an artificial aerial for many of their experiments. All the same we cannot see why experimenters should make application to use a non -radiating system at all. A no n radiating system cannot be used for the purpose of communicating, and therefore does not fall within the administration of the Post Office. Surely one may possess any kit c of gear which might possibly be employed for transmission without authority ? The experimentet in high frequency work could, we should imagine install a loo kW. generator with suitable -oscillatory valves and circuits to handle this energy without seeking per- mission from anyone, provided it is connected up to a non -radiating artificial aerial circuit comprising resistance and capacity. www.americanradiohistory.com PTEMHEIR 5, 1923 THE WIRELESS WORLD AND RADIO REVIEW 753 RECEIVER DESIGN. CONSTRUCTIONAL DETAILS OF A FOUR -VALVE SET. The receiver described below has been specially designed to meet the constant demand for constructional details of a four -valve set embodying reliable circuit principles and arranged for home construction from component parts. By F. H. HAYNES. elating to Design. the receiver takes a somewhat permanent IT may be argued that a receiver is more shape one does not really " get the hang suited to experimental requirements of it." There are so many minute adjust- if it consists of the necessary component ments to be made in order to get the utmost parts displayed on the bench and wired out of a set, that the writer is of opinion p, or a number of component instruments that every station should be equipped with The finished receiver, which can be inspected at the office of this Journal (12 nod 13, Henrietta Street, W.C.2) connected together. It is admitted that a receiver of the boxed -up type which is this arrangement does permit of making stable and robust, and with which fine circuit changes, but unless fundamentally adjustments can be easily observed and new circuit principles are- to be tried out, noted. A few spare components can be set it does not allow for rapidly changing aside for original work. The locking up of from one receiving system to another. It valuable components in a permanent receiver is not possible to become adept in the is fully warranted because with the complete skilful manipulation of the set which is instrument the experimenter can make laid out on the bench unless it remains observations which would not be possible wired almost permanently to one circuit. with temporarily wired units. True, one Efficient reception depends essentially upon type of circuit will not be suited to every critical and careful tuning, and unless class of reception, and for this reason switches www.americanradiohistory.com 754 THE WIRELESS WORLD AND RADIO REVIEW SEPTEMBER 5, 1 133/4- MAX. OFF MAX. OFF MAX. Orr MAX. OFF 0- - 10 to 31/4 J_ 2517- P/8" - / \ / A. OFF ON ON AO 0, 0, AD -2_ -+- LIC 40 50 016- 4ö" Api 0 o e. ONI N.V0011 \\W \ Aws 4,1,1 o- 060 0 / ///./ 0 01 o o o www.americanradiohistory.com PTEMBER 5, 1923 THE WIRELESS WORLD AND RADIO REVIEW 755 iently arranged are liberally introduced and can even be wound to produce a step -up ive various circuit combinations. Again, potential though they cannot be employed in author has heard it said that the intro - an instrument designed for universal use, tion of switches into multi -valve circuits whilst the gain in amplification by their use s rise to losses, but whether or not this is, perhaps, debatable. A valve is used as he case depends upon the type of switch a detector in lieu of a crystal as reaction can )loyed and the method of wiring. be arranged between its plate circuit and the 'he instrument under description consists tuned anode. Although a crystal may one high frequency amplifier, detector be a very efficient rectifier, it often will not ve, and two note magnifiers. High handle currents of big amplitude such as luency amplification is an essential feature may be obtained from an oscillating high any receiver, though the manipulation frequency amplifier, and, moreover, in itself more than one high frequency amplifier cannot stimulate oscillation in oscillatory extremely difficult unless semi -aperiodic circuits to compensate for the high frequency cuits which do not require critical ad- resistance they may possess.
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