1925-03-04 — Page 11

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THE HONGKONG TELEGRAPH.

RADIO NOTES AND NEWS.

WEDNESDAY, MARCH 4, 1925.

Progresss, in the Wireless Field.

mlasion of photographs by wiro- loss. This is far removed from selevision, which would involve jconsiderably groator spoeding-up of the operations, but suggestions have sloady been put forward for accomplishing this, though many, of them have not yet boon tried. out experimentally. The advent of this art, nevertheless, should

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tortion--rosONSHOO.

From the early mathematical suitable chomial treatment so as predictions of Clerk Maxwell as to increase the officioner of the to the electromagnetic or wireless valve with reepoot its filament waves to the present stato of the current consumption. the wirelena art is, indeed, a gront

The two most onnonlin! parts of not long be delayed.

The art of direction-finding by step forward, and one that could scarcely have boon anticipated at any roade ist system-the trans- the time the existence of those mitting microphone and the loud wireless is still in its infancy. oleo Improved apparatus is constantly! oxport boing brought out and now ap-1 considerabla other waves wore first prodleted, speaking receiver-hive

received Writon A Radio Engineer" in tho Manchester Guardian Com attention, with most bonoflelal plications are being found in results. The microphone evolved which it can be used to advan For navigational work its mercial. The first practical re-

up to the present is not yot ideal, tago. Hertz was not followed such

removed from thin desirable ly. Lighthouses and ships aro might, spacdy development as porhope, have been expected had condition, boing almost free from being equipped with direction- Tho loud- for use in foggy weather, while that brilliant scientist not dind at that most common cause of dia. finding apparatus, particularly Buch a comparatively early age. ponkor, which for so long has a combination of line and radio- His work, however, was ably taken up by others, among the boen one of the weakest links in apparatus is rapidly coming into the broadcast chain, has under- use as an aid in the navigation most prominent of whom ware

As a result gono radical altoration in the of narrow, shallow, or otherwise Lodge and Marconi.

latest modola. While still retain-difoult waters undor unfavour-i of the vision, confidenco, patience, and parseverance shown by the ing the electromagnetic system abio olimatic conditions and an as a base of operation, the dis-auxillary to other navigational latter, the world is now able to tortion-causing resonance effects methods.

advantage of the onjoy the

boon to the horn havo duo

Perhaps the most important off his labour, Not fruit of

eliminated by abolishing any future developments of radio, the Initial only WAB auccess due to his offorts, but he form of horn or trumpet, which however, is not in the Gold of has been continuously at work of nocosily depends on raso-communication but in the ap and in the forefront with develop ance effects for its effleiont plication of valves and auxiliary

objoot has apparatus functioning. This mont, which is ovon now proceed-now been achieved by increasing Several such applications have! ing at such a pace as to appear the size of the diaphragm boon proposed and oarried out a almost incredible.

no that it is of similar a small scale for the utilisation of The early transmitting systems, order of magnitudo. 03 the valvos as rectifiers, awitches, and doponding on the arc and spark

acustic other pawor apparatus, attention for their operation, were revolu-wave-length of the tionised by Fleming's original frequencies involved in the opera- now being directed with some discovery of the two-electrode tion of the instrument a low mass succasa to the production of valvo consistent with the increased units with a high-power capacity.

routifying valve, the value of which was enormously increased by Leo de Forest's invention, in which he inserted a third aloo trode, thus giving to the world the throo electrodo or triodo valvo, as we now know it. in the early stages the valve was to the same not exhausted high degree of vacuum which is now the common practice, and trilate should be paid to Lang muir, not only for his work which: led to the devolopment of the hard valve as now used but also valuable work on pumps for high vacuum work, this boing largely instrumental rondoring pos sible the commercial production of such highly evacuated valves. VALVE IMPERFECTIONS.

。

PORTABLE SUPER-SET.

to fawor purposes

Sots of all kinds have boon tried out for portability, but this is the first time that the superheterodyne has boon made compact enough to be carried in a suitcase, Mr. Bront Daniel, who was formerly in the radio laboratory of the U.S. Bureau of Standards, did it. Ho is shown horo with his portable seven-tubo supersot, which can be carried in suitcase form with dry battor.os, loud speaker and loop. He has board Pacific coast stations from Washington with this outfit.

The requirements of broadcas- ting for faithful reproduction of speech and music soon mada ovidunt the imperfection of the valve as previously constructed. The two main defects were, first, its comparatively heavy filament current consumption and, sec- ondly, its microphonic tendencies due to the non-rigid constriction of the filament and grid or, in some cases, the plate Realisation of these fanits by manufacturors soon, however, produced the nac- Valves osary improvements. are now available in a variety of makes practically free from any such microphonic tondencies, the construction having been mater-diaphragm rosulting from the ially altered to achieve this ond. employment of pleated papor in Oreat advances also have been its construction. made in the direction of inoras.

sing the filament emission by

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5

ENGLISH RECORDS

{{

"LITTLE SONGS FOR LITTLE VOICES"

Ft. 1-(a) ROBIN; ROBIN; (b) CHILD'S GOOD NIGHT

Pt. 2) tHREE LITTLE PIGS, (b) NAUGHTY TOM

Pt 3-(a) WILL YOU WALK A LITTLE FASTER!

(5) THE POODLE

Pt. 4-(a) PUFF. (b) THE SNOWMAN

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TALKING

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{THE SLEEPING PRINCESS

{

LITTLE RED RIDING HOOD PARTS 1 AND 2

AT

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what has occurrod in communi- cation apparatus, but in the future) this position would appear to be portance is beginning to bo more' generally realised, and the ex- tended use that is being made! of high-tonalon transmission Various colourn should matorially assist this 'pro-and sizes.

Of other developments outside those primarily connected with radio-telophony the most strik-likely to be reversed, as its im- SOUTH

CHINA KNITTING FACTORY

Hosiery Manufacturers

ing is probably that due to Senator Marconi and his as sistants on the one hand and the American Wostinghouso Com. pany on the other. This is the romarkable discovery of thegress. The commercial usan to Excellent range of short wave (100 matres or loss) wireless. Provious work had been directed to the use of avor-increasing wave-lengths and high-power stations, but recent work has shown the increased range that can be obtained with short waves even with broadcast transmission. In addition to this, it has boon found that these short waves do not suffor from fading" to the samo extent the longer waves, while the possibility of roflooting thom into beams comnes into the range of probability, and in some cases during the last twelve months this condition has actual- ly boon realised, one direct result of this being the erection of low power boam stations for inter- Empiro communication.

which tho high-frequency in duction furnace is being applied Quality. become more evident day by day, Lowest Prices. while the region of chemistry and Inspection and Enquiries the effects to bo chtained from

Solicited. the use of radio-frequency eloo- trical power in the chemical in- dustry have as yet only boon touched upon.

PHOTOGRAPHIS BY WIRELESS. Although much work has boon carried out during the last twelvo or oightson months on the range of short-wave wireless wavou the subject has by no means bean fully explored. As the phano manon cannot be, explained thooretically it is impossible to stato what the result will be of the work now boing carried out in the direction, though there are indicatione that further develop- mouts may be expected in the improvemont of the offlelency of both transmitting and receiving aots, which should react favour ably on wirelose mussago ratos throughout the world.

work,

Recent experimental some which has been simost on a commercial goals, points tho way to the speady perfection of a practical system of radio- tele-photography, or the trans-

BROADCASTER.

Mr. William Tylor. Fago, roading clerk of the HousD of Representatives, is shown reading President Coolidge's message so that radio fans might hear it.

FUTURE OF WIRELESS.

Signor Marconi's Views.

Now Promises

Bhang Tung Stroot, Mongkok, Hongkong. Tol. K, 593.

Tal. Address :- "BOUCHIENIT" Codos, Bentley's and Privato.

servicos, enabling messages to be exchanged between romote coun- tries, much moro rapidly and at far loss cost than at present, thus "British broadcasting ontors stimulating both business and upon its third your with groat friendly relations in a marked promise. The number of roosiv-degroo."

PHILIPPINES RADIO.

Recent Lawsuit.

ing licencor now oxcoeds a million no less than one half of which have been added during the last twelve months. The record is a gratifying.one for the broadcast- The first Important battle in ing industry, and shows that the long-drawn out war between broadcasting has now become on the Far Eastern Radio, Inc. and integral part of the life of the the Radio Corporation of the people, says Signee Marconi in a Philippines to secure control of message to British radio eD-radio sorvloe in the islands wan thusiasts.

won by Far Eastora last week, "I am glad to take this opport- when Julge M. V. del Rosario, unity of congratulating not only assistant pabilo utility com those who have been responsible missionor, granted that corpora for the organisation and production & certificate of public con-- tion of programmes, and those ventonce and necessity for radio who have brought transmitting broadcasting, radio-telegraph and and receiving apparatus to its radio-telephone, faoluding com present state of offioionoy, but muafcation to and from foreign also the wireless public, without countries sat denied the applica whose ready co-operation and tion of the Radio Corporation of advice the broadcasting officials of the Patlippines for a temporary could not have achieved so ra sertifiosto: į,markable a result.

In denying the petition of Wireless has also made im-(the latter company, Judge dat [portant progress in the direction Rosario hold that operation of ite of long-diatapuu telegraphic com-ralle service is not an "urgap, munications. The success which character. The decision, howATSE" bas attended rocont experiments it was stated, will not prejudices epoourages the hope that at no hearing on a later date of the distant time we shall have a world company's application wide system of direct wirelessį permanent certificato.

for