1927-05-17 — Page 10

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YEE SANG FAT CO

Hong Kong's Artistic Photographers

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YING MING STUDIO

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(Official Photographers of the "China Mail.")

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THE CHINA MAIL.

RADIO TOPICS

BROADCASTING.

THE WONDER OF THE VALVE.

simulation of music which is to enjoy good loud-speaker recep- being performed, fifty, a hundred, tion with simple two or three- a thousand miles away.

valve sets. That is the goal towards which those who have the best interests of broadcasting at heart are striving,

valves metres.

"Daventry Junior.”.

Further Progress. Wonderful as is the wireless valve in its present form, and TOUCHSTONE OF ROMANCE. officiant as it undoubtedly is, it is still being developed. Recently

A new situation has arisen with I have been experimenting with regard to the first of the regional two very wonderful examples stations, that known as "Daven- which have come to me from Ger- try Junior." It was to have used many. One consists of two high | 2 wave-length of about 400 frequency amplifying

'But the Cork station made up in one "bottle" the has settled on that spot in the other consists of a detector, low broadcasting spectrum, and now frequency amplifier and output that it is in full operation is being valve, similarly made up in one heard as far cast as Crewe and With these two multi- Leicester. There are a good many other stations working round about that wave-length, and it appears that the new bigh-. power station will have to choose some less congested spot if its tests are to be at all useful in the highly technical matters which have to be considered.

How many hundreds of thou sands, or millions, of wireless valves are turned out each year by the manufacturers I do not know and I have no means of finding out; but It will be a great pity if mere numbers seeing them on every hand-cause us to regard them as no more wonder- | bulb. ful than bottles or Christmas tree ornaments, writes a special cor- respondent of the "Observer," Looked at with an understanding eye, a wireless valve is seen to be filled with the most exciting and jolly kind of romance. Apart altogether from the delicacy of touch and the instrumental pre.

MONAT MELON WAIN NG

William D. Terrell, who has been chief radio supervisor for navigation, and who has been appointed director of the newly created independent radio divi- sion of the Department of Com- menze. Mr. Terrell's division will have charge of the execution of the decisions of the newly appointed radio commission,

cision which is required in their manufacture, the way in which it functions, as a whole, is a thing at which to wonder, Consider, first of all, the violent agitation of the atoms which go to make up the heated filament. We can think of these atoms as each a minute solar system, consisting of a number of "electrons"-almost infinitely small masses of nega- tive electricity-revolving in a well-defined orbit,

The "Grid."

THE NEXT STEP:

Broadcasting Throughout The Empire.

London, April 26. The "Daily News" experiments with short wave wireless trans- mission, at the Daventry Broad- casting Station haye shown that it may soon be possible to broad- cast practically throughout the Empire.

This possibility is now being seriously explored.

valves, two variable condensers and two high frequency trans- formers I have made up a set which gives quite wonderfully good reproduction from the local and one or two other stations. The results are not so good as I get from my standard four valve set; but they are much better than one hears from the average set. For local reception one valve only need be used.

Lean Pockets.

in

The majority of listeners this country are content to use only the transmissions from their local station, or, if they are not content, they have to use one station only because they are provided, with apparatus that is not suited for long-distance re- ception. The B.B.C. realises this, and has always done its best to cater for the man with the lean

HORN BLOWING UP-TO-DATE.

The inestimable value of Radio In the commercial world is excel- lently represented by an incident which occurred recently.

The Sparka-Withington Co., of America, Introduced a new motor hori known as "The Chimes,” and it proved so excellent that they were anxious for it to be heard in- mediately in England by Messrs. Graham Amplion, Ltd., who manu- country under Sparks-Withington | facture Sparton motor horns in that'

patents.

Mr. H. G. Sparks, of the Sparks- Withington Co., consequently rang up Messrs. Graham Amplion, Lut. by translantic radio telephone, and after an exchange of greetings pro-:

"The Chimes" ceeded to operate with the result that the true sound of the new motor horn was heard perfectly in London by Mr. W. H. Lynas,, Managing Director of Gra- ham Amplion, Ltd.

This is no doubt the first time in history that a motor horn sounded in the United States has been heard in Europe.

2,235,000 RADIO LICENCES.

The Postmaster-General, Siri Williant Mitchell-Thomson, stated.

Members of the newly appointed Federal Radio Commission. Left to right: H. H. Bellows, J. F. Dillon, E. 0. Sykes, and O. H Caldwell, Rear-Admiral William H. G. Ballard, Chairman of the Commission is in China, but will arrive home. soon to function with the Commission.

To in Parliament that at the end of February there were 2,235,000 wireless licences in force, an in- crease of 329,000 in a year.

There had also been 4,400 free licences granted to the blind.

Henting the flament disturbs these orbits and some of the elec- trons are thrown out, some of them right out of the mass of the filament. Normally they would fall back on to the filament to replace others that have been thrown out. But, by the battery connections in our circuit, we pocket and the low power. have made the plate of the valve the end that the best possible re- positive. The negative electrons ception may be obtained with the fly to positive plate. They are re-simplest apparatus, the regional placed by negative electrons from scheme is to be put into working; the high tension battery, and order as soon as possible. Mean- round goes the electric current, while there is the beginning of full circle. Having started thean agitation against this scheme, current we can control it by fostered by owners of high-power means of the "grid," which acts apparatus and, certain interests as a kind of gate, letting now which would not like to see the more, now fewer, electrons flow, eclipse of those receivers which obedient to the intensity of the are designed to bring in the very incoming signals, their starting distant station. Broadcasting is and stopping. Because a very the amusement of the million, and small amount of energy on the any attempt to confine the best grid will control a comparatively that it can give to a kind of heavy- large current flow between the pursued aristocracy, whose badge Twice recently has wireless filament and the plate, and can is a coronet of valves, must be telephone communication been use the valve to amplify. Be- nipped in the bud. Valve ap established between Holland and cause a certain kind of metal, paratus is getting cheaper, slow-the Dutch East Indies, says an when heated, will throw off some ly but surely, and with the coming Amsterdam

message.

This, of the electrons which make up of the regional scheme many folk achievement, it is claimed, con- its, minute atoms, we can fill a who are now confined to a crystal stitutes a world's record for long-

with an almost exact set and headphones will be able distance wireless telephony.

room

Mr. A¡ P. Anderson, the Amplion Agent In Denmark, has had the honour of cupplying a Standard Amplion Dragon, A.R.19 to H.R.H. is a particular distinction, follow- Princess Dagmar of Denmark. This ing as it does the recent supply of a similar model to H.M. The King of Danmark.

· TUESDAY, MAY 17, 1927.

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