1931-04-09 — Page 2

HONG KONG DAILY PRESS THURSDAY, APRIL 9, 1931.

RADIO

ARCTURUS

The Famous Blue Tubes

For Better Radio Reception

Exclusive Features:---

LIFE-LIKE TONE.-When you purchased your radio set, you expected to get clear, life-like reception. That depends on the tubes you use! The exclusive, advanced design of Arcturus Tubes eliminates. mechanical background noises-every note, every word, comes in with a vivid Life-Like Tone. With a complete set of Arcturus Tubes in your radio, you know you'll get unusually clear, brilliant programmes. 7 SECOND ACTION.-Arcturus Blue Tubes in your radio set bring in programmes in just 7 seconds no annoying wait for programmes to begin. Just flip the switch, and by the time you turn the dial, the programme is there-quick, certain, as compared to the usual 30 seconds, or more, wait.

WORLD'S RECORDS FOR LONG LIFE. Throughout the world, Arcturus Blue Tubes are proving themselves to be the tubes that have Because established a world's record for long life. they withstand exceptional overloads that often burn out other tubes. Arcturus Blue Tubes assure the user of long, satisfactory service.

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DISTRIBUTORS.

FEATURES

REMARKABLE PROPERTIES OF COBALT-STEEL MAGNETS.

MAGNETISM A. MAIDEN AUNT" AMONG SCIENCES.

Sir Oliver Lodge when describ. |other impurities" and subjected; which has oven greater permeabi- ing the remarkable properties of to a particular form of heat treat-lity. In addition, it requires a less the now cobalt-steel magneta re- ment.

narked that "magactism is nierely

a word used by scientists to cloak their ignorance."

It is unfortunately only ton true that we know nothing whatever of! the absolute or fundamental nature either of magnetism or electricity Luckily, however, this does not prevent us from making good use of their known properties. Nor does it discourago us from seeking for further new properties in the hope that they too can be utilised to good purpose.

The Importance of Magnetism. -Magnetism, in particular, offers a vory promising field of research at the present time. For some reaBOD there is a general tendency to re- gard. it as a sort of "maiden sunt" Among the sciences-old-fashioned and ef little interest apart from its association with electricity.

Nickel-Iron Matériels,

Still more remarkable are the changes that can be produced by mixing iron with different propor- tions of nickel or cobalt. For example nickel-steel, which contains about 26 per cent. of nickel, bas practically no magnetic properties at all, although both. steel and nickel are normally magnetic metals,

elaborate form of heat treatment during manufacturo,

The permeability of ordinary Per- malloy is between six and seven times that of the best silicon steel, Roughly speaking a choke or trans formen fitted with a core of Perm- alloy is equivalent to one three times its weight and bulk having a silicon-steel core

14

considerable

This represents saving where questions of size and weight must be carefully studied, On the other hand, simply by As in the case of portable and changing the proportions of nickel transportable, sota. For instance, and iron, a number of different one well-known firm makes a trans- alloya €:03 be produced which former weighing only 7 oz, having ровня extraordinary... magnetic | a primary inductance as high as 80'

hearies, and step-up ratio of 2 permeability.

to 1."

Among these the most important, for the wireless constructor, is the particular series known as Permal Joy, Mumotal, etc., all of which produce an intense magnetic flux in response to a comparatively-feeble exciting-current.

A Few of the Advantages, "High-mu "cores are particular- ly suitable fer L.F. transformers, where the main object in view is to give an effective step-up in volt age.

Also

Nothing could be further from the truth.

The first of this series-Permal In fact, at least two

Since fewer primary turns are important developments in modern loya discovered some years ago required to create a given flux den. radio practice are due entirely to

by G. W. Einer of the Bell Telesity in the core, the self-capacity recent discoveries in the field of phone laboratorics. It consists of of the windings is correspondingly & mixture of four parts of nickel reduced, and thore in losa tendency magnetism. In the first place we have the introduction of nickel-iron with one of iron, the mixture being to bypass the higher notes. cored transformers for low-fre. subjected in the course of prepara-sines the ratio of secondary to quency amplifiers, and in, the pondtion to a particular and complicated primary windings can be increased, place the use of "permaacat " process of heating and cooling. for a given size of transformer, a magnets made of cobalt-steel for More recently a similar combina-higher step-up amplification is ob moving-coil loud-speakers.

tion of nickel and iron-known as | tainable. Permalloy C-has been discovered

The magnetic properties of iron are profoundly affected both by the presence of various "foreign" sub- stances in the metal; and by change

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(Continued on Page 3)

CHINA BUILDING (5TH FLOOR).

of temperature. Take, for instance, HAVE YOU HEARD THESE?

the difference between the magac.

tie behaviour of soft iron and an

nealed steel, which after all is only soft iron mixed with carbon and

TELEFUNKEN

THE WORLD'S BEST RADIO EQUIPMENT

This illustrates an All Mains set combined with loud speaker

GREAT SELECTIVITY

"RECEIVES

Manila, Canton, Japan and Local Station.

- For Demonstration and further particulars apply to :---

SIEMENS CHINA CO.

Office-Pedder Building, 4th Floor,

Showroom-27, Nathan Road,

Kowloon,

TELE FUN

KEN

Canton moo...SHAMEEN?

Bwalow

...GEDE. BOESE

Here are Hats of long-waTE and short-wave stations which should be picked up by anyone in Hong Kong who has a mode. rately good set suitable for ra colving such signals. Success in picking up these stations also depends very largely upon fav. ourable atmospheric conditions. Headers are invited to add to this list should they succeed in pleking up any station not t cluded in either of these lists.

LONG-WAVE STATIONS.

4

Ware Jength

Call

Kilo- (Metres) Station Sign cycle

200 Manila

K.Z.I.B. 1.IBA 277 Shanghai K.S.M.8. 1,088 280 Tienlin C.R.C. 1,070 310 Shanghai K.R.C. 907 320 Peping C.O.P.K. 945 345 Tokyo J.O.A.K. 870 353 Hiroshima J.O.F.K. 850 355 Hong Kong Z.B.W. 843 357 Bombay. V.U.B

301 Sapporo

366 Keijo

370 Nagoya

379.4 Calcutta

840

3.0.I.K. 820 J.O.D.K. 820 J.O.C.K. 810

V.U.O 809.D

380 Kumamoto J.O.G.K.. 790 J.O.H.K. 770 J.D.A.K. V.U.R.

300. Sendai 365 Dairea 398 Rangoon 400 Canka 410 Conton 413 Manila

SHORT-WAVE STATIONS.

STATION

CALL BION

67.65 Doblutz (Germany) A.F.K.

€0.19 | Khabarovsk (Husila) | R.4.07.

.88.7 Nanou

50. Moscow

43.6 Rome

A.G.J,

KEN.

1.M.A. ·

42.

Forth

6.A.G.

41.3

Singapore

| Y.§.1.A.E.

$8.8

Kootwijk (Holland)

P.C.L.

37,

Bangkok (Siam)

HS4PJ.

32. Sydney

2.B.L.

-$1,66-|-Melbourne

21£0

81.48 Schenectady

81.20 Eindhoven (Holland)

P.C.J.

31.29 Sydney

2.F.C.

31..

Naseabi (Konya) J.LO.

28.5 Bydooy

2.M.B.

27.8 Bandoeng

P.L'E

Kito

Стева

.

760 754

J.O.B.K 780

C.M.B.

788

798

K Z.B.M.

TIME (HONG Koza)

OF WORKING

4,434 | Mon., Wod. & Fri, 0 pm. & 2 a.m

4,900 16-10 p.m.

| 5,291 | Not regular

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

6.81 Bunday midnight

7.142 Dally 6.80 p.m. & 11 p.m.

7,810 Not regular

7,780 Daily 11 pm.

8,108 Tuos, & Fri., 9 pm-3 a.m.

0230 Not regular 2.

0,503 Not regular

W.2.X.A.F. 9,630] Daily 7 3

25.53 Chelmsford (England)] 6.B.W.

23.36 Schenectady

2,620 Fri 8 am, Sat. 8 am, & 20 am.

0,500 Not regular

0,677 Midnight daily

10526 Not regular

1120 Midnight--8 am, dally

| 11,781 | 7.30 pm, & 3am, daily, except

12,340 Nightly

Saturday and Sunday

XLXE.

W.2.1.0. P.L.G.

12,850 4 Am. Wed., Fri, Sat.

IKA Kootwijk (Holland)** P.C.L

245 Manila

1888 Bandong

10.9 Bangkok

17.4 Bandoopg

F.L.F.

183 Kootwijk (Holland)

HAL.P.J POK

15,74 Bandoeng

P.LE

13.98 Fittsburg

W.S.XK,

TYPE T33 WL.

15,6 Nancy (Franco)

16,102 Daily 6.30 p.m. to midnight 10,304 Billy 7 p.m.

17,280 Dally 8 pan. to midnight

17,751 Sundays 7p.m midnight 18,404. Each allemoon

19,220|| Daily 6,807 p.1.

19,351 Daily 8am.

21,540 Not regular

[Allowance mest be made for “aummer-time ". in most Euro- pean countries, which is one hour ahead of frio:time.]

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