The -1 an D RADIO REVIEW (151P Year of Publication) \\`\\\ L No
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C7 The -1 AN D RADIO REVIEW (151P Year of Publication) \\`\\\ l No. 405. WEDNESDAY, JUNE IST, 1927. VOL. XX. No. 22. Editor : HUGH S. POCOCK. Assistant Editor : F. H. HAYNES. Editorial Offices : 139 -40, FLEET STREET, LONDON, E.C.4 - - Editorial Telephone : City 4011 (3 lines). Advertising and Publishing Offices : DORSET HOUSE, TUDOR STREET, LONDON, E.C.4. Telephone : City 2847 (13 lines). Telegrams : " Ethaworld, Fleet, London." COVENTRY : Hertford Street. BIRMINGHAM : Guildhall Buildings, Navigation Street. MANCHESTER : 199, Deansgate. Telegram., : "Cyclist Coventry." Telegrams : " Autoprese, Birmingham." T,I grams: "IIife, Manchester." Telephone: 6210 l oventry. Telephone: 2970 and 2971 Midland. Telephone: 8970 and 8971 City. Subscription Rates: Home, 17s. 4d.; Canada, 17s. 4d.; other countries abroad, 19s. od. per annum. As many of the circuits and apparatus described in these pages are covered by patents, readers are advised, before making use of them, to satisfy themselves that they would not be in fringing patents. EMPIRE BROADCASTING. It appeals to us as almost pathetic that on the occasion of our recent celebration of Empire Day a request should ENCE the publication of our last issue have been addressed to the Dutch station authorities at matters in connection with Empire broad- Eindhoven for the Empire Day programme to be broad- casting have proceeded apace. The B.B.C. cast to the British Empire through that station. The have made an announcement to the effect that request was turned down, and with good reason, we con- they are immediately sider, for what possible excuse undertaking t h e ..- .+.- have we for asking a foreign erection of a short - - broadcasting station to distribute a CONTENTS. wave station at Daventry, and PAGE programme of that character to they excuse themselves for not hav- EDITORIAL VIEWS ... ... ... 679 our own Empire, when it is merely ing gone ahead earlier on the score lack of enterprise on our part TELEVISION DEMONSTRATION IN that they did not feel justified in which has prevented us from spending public money on an enter- AMERICA. By A. Dinsdalc ... 680 being able to carry out such a prise which was only experimental PRACTICAL HINTS AND TIPS .. ... 687 transmission for ourselves? in character. If, that is the correct 0000 COIL- DRIVEN LOUD - SPEAKER IVITII explanation, it seems strange that TELEVISION. they arc now prepared to proceed PERMANENT MAGNETS with the station although, to the By H. Lloyd. N this issue we publish the first still .1 detailed account of what is, best of our knowledge, they C URRENI TOPICS ... 693 have obtained no special authority without question, the first success - to authorise the expenditure. THE EXPERIMENTER'S NOTEBOOK 695 ful public demonstration of tele- However, even though the step By " Empiricist." vision. The article provides a fascinating story, indicating the .taken is so delayed, we are yet READERS' NOVELTIES ... 697 glad to see that action is being extent to which science has brought 698 taken. ('apt. Eckersley has stated NEWS FROM THE CLUBS us in the direction of achieving that it will be some six months NEW APPARATUS ... 699 what, a year or two ago, would have been regarded as an impossi- before the station is completed, BROADCAST BREVITIES ... 701 a very long time -perhaps bility. It is clearly pointed out by and EDITOR years -before Enipire broadcast- LETTERS TO THE those responsible in America that ing can be inaugurated. It seems READERS' PROBLEMS 705 this demonstration must not be to us that there is no justification regarded as a service which for such a delay. It snould only promises early commercial prac- take a comparatively short time to erect a suitable station, ticability. The demonstration was carried out irrespec- and no one expects that the results can be perfect all at tive of cost and complexity of the apparatus ; for the once. As we have pointed out before in our early appeals purpose of carrying out the experiments nearly I,000 men for an Empire station, the Colonies and remoter sections were employed, and when the transmission was conducted of the Empire would be well satisfied for the time being by wireless three wavelengths had to be utilised ; hut tele- if a station in this country could give them results equal vision has been successfully demonstrated, and the task to those they obtain at present from the Dutch broad- of the future is to simplify the methods by which it is casting station. achieved. A7 www.americanradiohistory.com ase,.yC . .-C4 -141111111, .!"?P:!`a'`á1l`.!.,1g4 , Wksboo MpIlcl JUNE zsf, 1927. A Successful Public Demonstration of Television between Washington and New York. By A. DINSDALE. OR some time past great interest has centred round Bell Telephone Laboratories the in New York, and were en- problem of television- seeing at a distance by abled to telegraphy, speak to, and simultaneously see, friends over either wire or wireless. haver since the the ordinary long -distance ciscovcry of telephone line to Washington, selenium by May in 1873 television has been zoo miles away. the dream of scientists all the world over, and of recent In his introductory years more remarks Walter S. Gifford, Presi- and more research workers have entered this dent of the American fascinating field, Telephone and Telegraph Co.,' until there is now an international race stated that " the elaborateness for final success along of the equipment required practical lines. by the very nature of The latest experimenters the undertaking precludes any pre- to enter the field are a group sent possibility of television being of engineers associated with available in homes aml the great American Telephone offices generally. What its and Telegraph practical use may he 1 shall Co., one of America's largest industrial leave to your imagination." companies, which depends for its scientific progress upon Mr. Gifford then introduced Dr. Herbert E. Ives, vast organised laboratories staffed by some of the cleverest under whose direction the research work on television has telephone and radio engineers in the world. been carried out. Dr. Ives then gave the party a brief A group of engineers attached to these laboratories lecture, in the course of which he outlined the details of (The Bell Telephone Laboratories, Inc.) have been the invention, working and gave a demonstration of its operation away quietly on the problem for some years, between onv until, end of the laboratory and the other. In this on April 7th last, they were able to give a public demonstration he demonstration was assisted by Dr. Frank Gray, who of television over kith wire and wireless is responsible for circuits. several of the developments which made possible the complete system. This demonstration was given before a party of guests Following this demonstration Mr. Gifford which included business executives, then talked newspaper editors, over the telephone with General John J. Carty, engineers, and scientists. The party assembled vice - at the president of the company, who was in Washington. and A www.americanradiohistory.com WpeIl®00 os1 JUNE 1st, 1927. Wolaci Television Demonstration in America. - between the acts the announcer of the 'Whippany afterwards with Secretary Hoover, of the Department of studio made a television appearance during an- Commerce. nouncements. As Mr. Gifford talked to the General the latter's face An important feature of these demonstrations was that became visible on a small screen, measuring about two there was no difference in the quality of the reproduced inches by three inches, which was mounted in front of image, whether it was transmitted from one end of the Mr. Gifford's telephone. laboratory to the other, by wire from Washington, or by " How do you do, General? You are looking well," wireless from Whippany. said Mr. Gifford. The engineers responsible for this latest scientific de- The face of General Carty smiled and his voice velopment are well aware, and have made no secret of enquired after the health of the speaker on the New York the fact, that one of the serious problems in perfecting end. the invention for general commercial use is that of cost. " You screen well, General," said Mr. Gifford. " You For the purpose of the demonstration on April 7th, look more handsome over the wire." " Does it flatter me much ? " General Carty asked. " I think it is an improvement," was the reply. Loud -speaker and Large Screen. Mr. Hoover was then called to the telephone, and his speech was made audible to the assembled guests by means of a loud- speaker, whilst the (listant speaker was rendered visible on a large screen for auditorium use, measuring about two feet by three feet. This large illuminated transparent screen seemed some - what corrugated. This was clue to the fact that the squares which make up the picture are arranged in 5o rows, one on top of the other. As the eye became accus- tomed to looking at the screen in the darkened room the face was easily recognisable, although the features, which had been sharp and distinct on the miniature screen for individual use, had become considerably blurred by the enlargement. It was plain that, enlarged to the size of an ordinary motion picture film, the detail would have been completely lost. The invention is admitted to be far from the motion picture -house stage. The images reproduced upon the small screen have been described as being comparable to excellent daguer- reotypes which have come to life and started to talk. In these small pictures the detail of the face appears in Mr. W. S. Gifford, President of the American Telephone and clear -cut black lines against a shining gold background, Telegraph Co., talking from New York to Secretary Hoover in from the neon tube which Washington.