1932-01-21 — Page 2

Page

HONG KONG DAILY PRESS, THURSDAY, JANUARY 21, 1932.

RADIO

EVERYTHING GE.C.) ELECTRICAL

your guatanies

GECOPHONE ALL-ELECTRIC RADIO

SETS

and

RADIO GRAMOPHONES SPEAK FOR THEMSELVES.

DEMONSTRATIONS DAILY

from 11:00 am..

All apparatus to the value of £5 of over can be supplied on hire purchase terms.

Free service for 3 months

G.E.C. SHOWROOM Queen's Building, Chater Road, Hong Kong.

Osram

Valves

for

PURITY OF TONE

THE

SINCERE CO.

LIMITED

THE LARGEST RADIO DEALERS"

FEATURES

The Biggest Wireless Valve In The World.

A GREAT BRITISH ACHIEVEMENT.

FOUR METRES HIGH: WEIGHS OVER

'A TON.

Three Hundred Thousand Billion Electrons Por Second.

Physiendly this huge now valve stands 4 metres high, and is 36 mm. in diameter. Complete it weighs over a ton and is built on a welded steel bedplate 3 metres long by 11 inėtres wide. Its water-cooled steel anode weighs 153 kg, and is equip ped with hydraulic jacks to faci litate demounting and nasembly. Ite lament current is approxim ately 300 apores or several thon- Few branches of electrical scienen? Herein lies a romantic story of sand times that of a reviving valve, have made such rapid preguss nsxientific achievement and of a dis- and ite filament emission 100 that of wireless communication, and covery which has been developed by ampere representing the almost, in this rapid advance, involving the close co-operation between scientist, ¦ inconceivable electron Dow of | closely inter-related efforts of many1 engineer and artisanato its practical "#00,000,000,000,000,000 (three hun- } of the world's leading wientists, the utilisation in the world's largest dred thousand billion) 'electrons pér thempionic valve has played an ex-witole valve, an engineering mas second. It new operates the main | trepiece which achieves the ideal for transmitter at Rugby, thereby · re- seedingly important part.

which previous investigators have' placing a 'bank of 50 őrdinary high- strivena demountable and

con power valves,

This apparatis, originally invent ed in 1901 by Dr. J. A. Fleming, in the form of the two-electrode valve, tinuously evacuated valve,in a prac greatly improved by Er, Lee De tien}-commercial form.

Forest in 1007 by the introduction! of the grid or third electrode, and subsequently developed by inves tigators throughout the world, now forms, the heart of every modern system of wirelesa communication

Accidental Discovery.

The discovery leading to this

achievement emanated from the Re search Laboratories of the Metro

No glass is used in its conatrue- tion, but a robust combination of steel and pofectain, two of the magt "common materiala utilised in the manufacture of eletrical equip- ment. As a result of the continuous

evacuation, and in thurp contact with valves of the permanently Our great broadcasting systems; politan-Vickers Electrical Company sealed type, this now valve im- p<oves with age, any gas evolved trans-Atlantic- telephone, the of Great Britain wherein some during its operation and which in beam stations which form a great three years ago experiments in no the sealed valve would inevitably

the

a communication between

removed by the pampa.

HAVE YOU HEARD THESE?

Here are Hats of long-wave andakort-wave stations which should be ploked up by, anyone in Hong Kong who has a mode- rately good set suitable for re- Celving moh signala. Sucoses in picking up these stations also depends very largely upon fay ourable atmospheric conditions. Readers are invited to add to this list should they succeed is picking up any station pot in "cluded in either of these lists.

56.7 43

50.

LONG-WAVE STATIONS.

Wave length

Call

Kilo- (Metros) Station Sign oyale 200 Manila KZL.B. 1,153. 277 Shanghai - K.S.M.S. 1.083 345 Tokyo J.O.A.K, 970 353 Hiroshima · 2.0.F.K. 880 350 Hong Kong Z.B.W. 840 357 Bombay V.U.B.

J.O.LK. 301. Sapporo 360. Ksijo

370 Nagoya 370.4 Calcutta

840

.880 J.O.D.X, 990 JO.CE. 810. »V.U.C

BOR.9

700

380 Kumamoto J.O.G.K. are Sendei J.O.H.K. 770. 245 Dairen' LQA.K. 700

400 Osaka

410 Canton

t

480 Manila,

SHORT-WAVE STATIONS.

STATION

CALL SION

CTCLE

"

J.O.B.K 750

C.M.B. K.Z.R.M...02%

Ti (Hoxe KoxD)

OF WORKING

739

4,434 | Mon., Wed. & Frk, 6 p.m. & 2 am 3,090 0-10 p.m..

in

6,000 Tue, Thurs., Sat., 8 p.m.

6,8016; Sunday midnight'

7,142 Daily 6.30 p.m. & 11 p.m.

7310 Not regular

7.780 Daily 1 pa

U7.65 Dobitz (Germany) 60.12 Khabarovsk (Russia)

A.FK.

RA.07.

Naman

A.G.J.

5,291 Not regular

Mosco

B.EN.

Roine

1.M.A.

Perth

3.4.G.

41.3

Singapore

V.S.1.A.B.

28.8

Kootwijk (Holland)

F.C.L.

BT.

Bangkok (Siam)

HSLPJ

12.

Sydnoy

2.B.L.

31.55

Melbourne

a.L.O.

31.48 Schenectady

Thus an

31.20 Eindhoven (Holland) C 47.29 Sydney

F.C.

21.

(Kenya)

28.

7.1.C. 2.M.E

P. Lê B.

the distant parts of the farth, all way connected" with wireless com-impair the vägnum, belügzrapidly there have as their basis the dimunication or thermionic valves, exceedingly high vacuum is main- covery, and evolution of the ther and indeed not expected to be of any tained even at the highest power mionic rake.

industrial consequence, led to the inputs. The pumps, with the excep- production of oil distillates having tion of a simple type of primary extractor, have no moving parts, and mechanical trouble is therefore a very ruote positility.

Tet in spite of these rapid ad vances the wireless engineer has beta gravily restricted in his efforts, ruhemically and efficiently, to in-

remarkable properties.

They could be boiled at a fly ereas the power at his disporal by low pressure without decomposition the fact that the valve in its com-and yet at room temperature their mercial form has up to the present

Compibtely Demountabio.

Finally the valve is completely neessarily been constructed in the rate of evaporation was so gal demountable. In the event of fila form of a highly evacuated glass that they could be placed inside ament or other repairs being neces- balb into which are sealed perman-wireless valve without impairing ently the electrexles necemary for its the vacuum. Bucha material has almost as much appeal to the vacuum physicist of to-day as had the philosophers stone to the early

alchemist.

eneration.

J

The difficulties of construction i and operation, of this type of valvej increased enormofisly as greater and greater outputs were requir- ed. Cooling, deterioration of the

It was quickly realised that here!

cary, it may be rapidly taken to pieces the repairs executed with

whole re-assembled and placed back ordinary engineering tools, and the

into operation in the course of a few hours-truly a remarkable achieve-

ment.

These new developmenta havoi made possible the manufacture of

vacuum and the great expense of, was the ideal liquid to replace the valves expable of dealing with out- i replacement when the valve failed-mercury of the vapour pump, as due puts considerably higher than 800 all had presented diffealt and into its, low volatility cooling could (kw, and demountable continuously sonde cases insurmountable prob. now be efected with water and the cumbersome and expensive liquid air process eliminated.

leros.

f.

For many years the ident of a valve whore vacuum would not fe!

me poorer with age, in which the great difficulty of sealing off the eireirodos under vacuum in the pro- verse of munufacture would be avoid fed and in which the filament could)

IN HONGKONG & SOUTH CHINA||e replaced or other repair's excest

ARE

THE ONLY AUTHORISED

AND ACCREDITED

Sole Agents and Distributors

SINCE 1927

FOR

PILOT RADIO & TUBE CORPORATION

THE

LAWRENCE, MASS., U.S.A.

LARGEST RADIO PLANT IN THE WORLD

This was a vitally important stẹp removing as it didahe continuously evacuated valve from the realm of laboratory apparatus and placing it at the servier of the engineer."

evacuated ratres of many times this power-in itself several times that of what was previously the world's largest-nre in no sense a visionary prospect.

It is fitting that a time when tho homage of the scientific world is being paid to the memory of In 1950 a valve derigned for Michael Faraday, who 100 years ago input of approximately 20 kwa waz laid the foundation of electrical ed, and the valve rapidly and easily constructed, incorporating the vagineering by his momentous dis again placed in operation, has been development, and proved yn satis covery, and exposition of the pria- factory in operation, not enly in cipal of electromagnetic induction, the object of musti investigation.

By the achievement of this ideal the laboratory, but also in netual British inventive genius should add it was seen that the valve would be continuous sorties at the Rugby yet another outstanding discovery come not a thing of ephemeral glory Wireless Station, that the British

to its record of achievement,

a

with a restricted life inevitably Post Office which had from the early It would be prxmature to dilato

a lively and progres- followed by expensive replacement, stages adiowo

bilities. While the new develop- but a permanent and lasting ploco sive interest in these tests, try length on its future possi- ed the Metropolitan-Vickers Elec-ment will be of vast importance of engineering equipment.

Continually evacuated valves have trical Company with the design and primarily in the field of wireless

manufacture of a 500 kw. valve," previously been operated success-

einmunication, the possibility of Thus, after many months" of handling auch large power` and, of fully under laboratory conditions, the vacuum being maintained by effort involving careful design, con utilising, in the fed of power on- means of the mercury vapour pump, tant experiment, detailed testing gineering, the diversity of applica This process, however, was rendered and the overcoming of numerous tion which characterises the ther- commercially impracticable by the mechanical dificulties some of the mionic valve, opens up prospects fact that the mercury vapour, due parts, for instance, called for an of momentous future changes in to its high vapour pressure, pre necuracy in commercial production electrical engineering practice. vented the caviary.

degree of of the order of cos m.man e-Just the giant turbo alternatora vacuum from being maintained un-tirely new development conceived of to-day compare with Faraday'e less recourse was "had to the expen less than three years before has been early dynamos, so perhaps will this Bivo and unwieldly procers of cool brought to a successful commercial) new wireless valve compare with its ing with liquid air.

more. philosophical predecessor3:

conclusion:

...

27.8

8,108 Tues, & Fri, 9 pm,-1 a,m 0,380 Not regular

1,603 Not regular

(W.LXA.F|| 1,580.

Nairobi Sydney Bandoeng 25.63 Chelmsford (England) 5.8.1 24.5 Manila

28.88 Solanectady 18.88 Bandoeng

K.1.X.3.

W.,X.0.

P.L.G.

13.4 174

F.O.L. Kootwijk (Holland)

Bandoung

· P.L.F.

18.0 Bangkok

10,8 Kootwijk (Holland)

15,74 Bandoăng

15.6 Nancy (France). 13.03 Pittsburg

1:

1,680 Daily 78,2

0,020 Fri. 3.20., Bat. & ain. & 10 am. 0800 Not regular #1177

Midnight daily

16,328 Not regular

11,020 | Midalga-3 am, dally 11,751 780 pn. & 8 ani. daily, groupt

Satu day and Sunday

| 12,240 | Nightly

12,850) <.10. Wod., Fri, Sat.

10,302† Delly (1.80 p,m, to midnight

16,304 Daily 7 p..

17.20 Daily a p.zi, to midnight

EL81.PJ. 17,751 Sunday 7 p. & midnight P.C.X.

||

18,404 Exob afternoon.

P.L.A. 19,250 Daily 1.30—7 p...

W.3.X.K.

10,351 Daily 8 a.m.-- 21,543 Not regular

[Allowance must be made for “sumer-time" in most Euro- pean countries, which is one hour ahead of true time.]

the be

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