1930-04-10 — Page 2

THE HONG KONG DAILY PRESS, THURSDAY, APRIL 10, 1930.

Pythagoras calls Three

"the perfect number'

C

EXPRESSIVE OF THE "BEGINNING,

MIDDLE AND END,"

The ancient world was ruled by thres Gods, Jupiter (beaven), Neptuno (sca) and Pinto (hades).

The Fates are three, and the Furies three, the Graces three, the Harpies three, the Sibylline Books three, and the Huses theee times three. Man is threefold (body, soul, spirit); the kingdoms of Nature three (animal, vegetable, minema!), the World threefold (earth, sea, ir)-AND the new era in trans-Pacific travel is introduced by

three new giant motorships - "CHICHIBU MARU”

3 "TATSUTA MURU"

"ASAMA MARU”

Designed, to identical experlative standards of size, speed, interior accommodation and luxury, Serting new standards in first, second and stee age class, over the popular route to Americ

*THE SILM EXPRESS

N.Y.K.

VIA HONOLULU

RADIO

WE HAVE JUST RECEIVED A NEW SHIP- MENT OF OUR FAMOUS RECEIVING SETS

TELEFUNKEN 30 W

TELE FUND

THE IDEAL SET FOR LOCAL RECEPTION 3 Valves Working Entirely from Lighting Mains, either 110 or 220 Volts. 200-2,000 Metres with Built-in Coils. Also Fitted with

Pick-up Connections for Gramophone"

Price: H.K. $130.00

·DISCOUNT FOR CASH 18%

SIEMENS CHINA CO.,

PEDDER BUILDING, 4TH FLOOR, HONG KONG.

Showroom:-.

KOWLOON

PEKING BUILDINGS,

27, NATHAN BOLD,

Also Obtainable:--- Messrs. WAH HEI ELECTRIC CO., -195, Die Vaux Road. HUNG MING ELECTRIC CO., 157, Des Your Boad. ANDERSON MUSIC CO., ST. GEORGE'S BUILDINO, ION HOUSE STREET.

BUY BRITISH & BE PROUD We have just unpacked a Shipment of

FEATURES

ADVICE ON CHOOSING A LOUD- SPEAKER.

HISTORY AND DEVELOPMENT OF THE SOUND PRODUCER.

[Br." COHERER."]

Systems of loud-speaker repro- proximity to a magnet of consider- duction come, mainly, under threeable strength, made of steel with headings, the electro-magnetic-in-4 large percentage of cobalt, High- duction or horn type, the read driven cone-speaker, and the mov. ing-coil instrument.

The first-named, after being for many years without a rival, ha been superseded during the last two or three years by the latter two, and is now almost obsolete.

The moving.coil instrament, although the most modern of the three, has not yet outplaced the reed-driven cone in popularity, and it is this latter type that is most commonly used at the present day. In performance, the moving-call instrument boasts of a response over a wider range of frequencies than any other system, but in ad dition to its high cost it necessitates an additional direct current supply. which rules out its practicability with the majority of amateurs.

The Horn Loud-Speaker, In the early days of broadcasting, when receiving-eets, passing beyond the crystal stage, demanded a cap- able system of reproduction, many makes of horn loudspeakers were soon on the market. In action, this system is nothing but an enlarge- ment of Bell's original telephone receiver.

A diaphragm of metal, usually an alloy of soft iron and steel, is clamped at its periphery so as to bring the under-surface into close

resistance coils are wound on the legs of the magnet, and the ter minals of these coils are connected to the receiving-set.

A horn in Atted to a small aper- ture in the easing of the unit im- mediately over the centre of the diaphragto.

An oscillatory current passing through the windings will add to or eppose the effect of the magnet, depending on the direction of the current,

This, of course, tends to attract or repel the diaphragm and so it is set into vibration, causing sound waves arising from the current passing through the receiver.

Variations in Design.

vour to get a uniform response over the whole surface of the diaphragm.

It was not, however, until the advent of the cone-speaker" that any considerable departure was made from the action of electro- magnetic-induction in loud-speaker reproduction.

The Rood-Driven Cone. With improvement in receiver de- sign and radio developing a greater, and therefore more critical, follow- ing, the shortcomings of the horn- speaker were soon glaringly dis closed, certain tones, in even the best of models meeting with a far from faithful response.

ITSANG FOOK PIANO COMPANY,

"A large disc of material from which a segment has been cut and the edges joined, thereby assuming a coinical shape, achieves the sur- facs area and regidity required. A reed or spindle attached to the upex of the cone, in much the same way as the stylus of an ordinary gramophone sound-box, is attached to its diaphragm and the magnetic,

unit converted to drive or vibrate npindle instead of a diaphragm. describes the basis of the cone- apeaker. The essential components of the unit are much the same na those used for the born type loud-speaker, varying of course, in shape.

·

The Read Action, If one can imagine a very small diaphragm taking the place of the one described for a horn loud- speaker unit, to the centre of which i fixed one end of the spindle, then the action of the reed-drive can be easily understood.

Naturally, there are many difficul ties that prevent such a simple unit being put into practice, such as suspension of the diaphragm and the maximum magnetic strain being brought to bear. where it has most, effect.

Experiments with diaphragms had made it apparent that not only Different manufacturers overcome had the area to be greatly increas these difficulties in a number of ed to give scope to all frequencies,

ways, but the action-that of a but that the diaphragm would have piece of metal (termed the arma- The diaphragm varies as to size to vibrate uniformly as a whole.

ture) being subjected to a varying Neither of these points were, of magnetic strain which is imparted from two to four inches in diameter, and from one-hundredth to one- course, practicable with the then

to a spindle in the form of vibra fiftieth of an inch in thickness,

present practice. The base of such

tions, is the same throughout. different sizea responding more A speaker would be ridiculously

Some makes of, cone unit have a small condenser or choke 'coil joined. favourably to different bands of large and cumbersome, and the fact that the diaphragm had to be

across the windings, to give a sound frequency. Although, in

smoothing effect to the current, and effect, the action of all hern-speak-clamped at the edge to prevent

adhesion to the magnet ruled out there are various method of ad- ers is on this principle, various

the possibility of the second point. justment by which the arinature is designs in horn construction have

In addition, a plane diaphragma brought into the strongest magnetic been exploited by different manu-

of suitable material, oven whenfeld without sticking to the magnet facturers, with a view to form-

secure at the edgo would, by virtue ing an air column and radiation surface suitable for the diaphragm. of the diameter required (eight to twelve inches). and its extreme used. The construction and layout of the components used in the thinness, be apt to sag, losing the unit have also been subject to con-rigidity required for perfect func-

tiouing, siderable experiment, in an enden.

HAVE YOU HEARD THESE?

Here are lista of long-wave. And short-wave stations which should be picked up by anyone in Hong Kong who has a moda. rately good act suitable for re ceiving such signals. Success in picking up these stations also depends very largely upon fav ourable atmospheric, conditiona. Readers are invited to add to this list should they succeed in picking up any station not cluded in either of these lista.

:4

LONG-WAVE STATIONS.

Wayc

length (Metres) Station

200 Manila 277 Shanghai · 290 Tientsin 310 Shanghai- 320 Peping

Call Kilo- Siga cycle K.Z.I.B. 1,133 K.S.ML.B. 1,083 C.R.C. 1,070 K.R.C; 967 0.0.P.K. DIS

345 Tokyo J.O.AK. 870 353 Hiroshima J.O.F.K 850 355 Hong Kong Z.B.W. 846 357 Bombay V.U.B. 840

J.O.I.K... 361 Sapporo

830... 300 Keijo

J.O.DK.

820 370 Nagoya

.J.O.C.K. B10

7.0.0

370.4 Calcutta

300 Sendai 355 Dairen

509.9

380 Kumamoto J.O.G.K. 790 J.O.H.K. 770 J.D.A.K. 760 V.U.R. 76-4 J.O.B.K. 750 .C.M.B. 734 K.Z.R.M. 726

308 Rangoon 400 Osaka 410 Canton 415. Manila

SHORT-WAVE STATIONS.

STATION

CALL SIGN

67.86 Dobiutz (Germany) 4.F.K. 60.13 Khabarovsk (Russia) R.A.7.

XILO

Стеска

*T* (Hoxe Hore},

OF WORKING

4,434 Mon., Wed. & Fri, 6 p.m. & 2 a.. 4,990 6—10 p.m.. 6,291 Not regular

6,000 Tues, Thurs., Sat, 8 p. Sanday midnight 6,806

7,142 Daily 8.80 p.m.4.11 p.m. 7310 Not regular 1730 Daily 1

9 p.m.4i ám. 8,108 Tuel. & Fri, 9 1230 Not 323Not regular regular 9,603 9,530 Daily 7.

58,7

Navon

A.G.J.

60,

Moscow

E.F.N.

43.5

Бото

1.M.A

懿

Perth

41.8

Singapore

B.A.G. V.S.1.L.B.

29.9

Kootwijk (Holland) P.C.L

$7.

32.b Bydney

Bangkok (Biam)

11.55 Melbourne

81.48 Schenectady

HSLPJ 2.B.I." 3.L.Q. W.2.X.A.F.

31.30 Eindhoven (Holland) PEJ,

31.28 Sydney

2.F.C.

9,600 | Not regular

81.

Nairobi (Kenya)

T.L.O.

9,877 Midnight daily

29.6 Bydney

2.M.E.

10,526 Not regular

27,8 Bandoeng

PLE

11,020 Midnight--3 mm, dally"

26.53 Chelmsford (England) 6.8.W

24.0

Manila 23.35 Schenectady

K.LXE.

12,240 Nightly

W2x0,

18.89 Bandoung

PLO,

18.4

Kootwijk (Holland).

P.C.L.

17.4

Bandoong

PLE

10.9

Bangkok

16.58 Haizen (Holland)

FH.L.

-18.3

KENY

Kootwijk (Holland)

P.C.K.

18.74 Bandoeng

PLE

15.5 Nancy (France).

13.93 Pittsburg

W.8.X.K

STELEN FUM

ALUMINIUM BASE-BOARD & PANELS. Buitable for, Short Ware Receivers and other sets that require Screening &

OTHER BADIO & WIRELESS PARTS

(Guaranteed British Made).

11,761 7.80 pân. & 8 a.m. daly, except

Saturday and Sunday

13,850 m: Wed, Fri., Est..

18,102 Daily 8.20 p.m. to midnight 28,804 Daily 7 p.m.

17.280 Daily 8 pm to midnight

HL.6.1.P.J. 17,781 Sunday 7 pm, & midnight...

LOCAL BROADCASTING.

REVISED PROGRAMME OF

HOURS OF RADIO. Following are, the revised local broadcasting programme hours from April 18 to September 13:- Mondays, Wednesdays and Friday?. 11.00-11.30 a..-Commercial news.

T

17,769 Drily 10 p.m.

18,404] Each afternoon.

19,820 Daily 5.30-7 p..

19,851) Daily 8 km..

21,540 Not regular

music

-0.00-7.00 p.m.-Chinese recorded

7.00-10.30 p..-English progra

me.

Tuesdays and Thursdays. As above excepting evening pro- gramme, which would be 6.00-8:00 p.m.-English, 8.00-Midnight,--Chinese.

Saturdays,

ORIENTAL COMMERCIAL & Co.. LTD. 11:30-12.30 pin-Chiness recorded 11.00-11.30 am-Commercial news,

BANK OF CANTON BUILDING,

Tax C. 4405.

music.

12.30 2.00 p.m.-English recorded

zausic

11.30-19.30 p.m.-Chiness recorded

music (Continued at foot of neet column).

TO-DAY'S WIRELESS

PROGRAMME.

BROADCAST BY ZB.W. ON

FA

335 METRES.

11 to 11.30 am.-Commercial News, 12.30 to 1.30 p.m.-Demonstrating

programme.

1.30 p.m.-Weather report.

5 to 7 p.m.-European programme. of Victor records, supplied by Messrs. Tsang Fook Piano Co.: "Marche. Slave" (Tschaikowsky, Op. 31), Philadelphia Sym- the phony Orchestra under direction of Leopold Stokowski: "Little Grey Home In The Weat " (D. Eardley-Wilmot - Herman Lohr) and From The Land of the Sky Blue Water" (Nelle Richmond

Eberhart Charles Wakefield Cadman), Mary,

Lewis At Evening (Rudolf Friml

Walter Transcribed by A. Krame) and Letter of Love - (Cui-Elama), Mischa Elman, Piano accompaniment, Josef Bonime.

when a heavy current is applied.

A further discussion of this type of loud-apeaker and the trend of modern design in loud-speaker re- production will be dealt with in. these columns next week:

tra.

"Wait Til You See Me Cherie"

(Leo Robin-Richard A Whit ing) and Louise" (Leo Robin. Richard A. Whiting). Maurice Chevalier, Baritone, with orches

"National Emblem March" (E. E.

Bagley)

Out and Lights March" (E. E. McCoy), Arthur. Pryor's Band... "Souvenir, Barcarolle, Humoręs. que" (arr. by De Pace) and

Neapolitan Caprice (Capric

cia Napolitano) (De Pace);

Dou

Des Vœux Road Central

(Entrance Ice House Street) Telephone C 4548.

Simplicity itself

One-motion timing. Sumpfited circuit. Units all interchange» able.

There' noting Hke

micro-synchr

Radio

PILOT

A. C.

Bernardo De Pace Mandolin "SUPER-WASP' Solo with piano.

(William "Annie Laurie "

glass-Lady John Scott) and Long, Long Ago" (Thomas Haynes Bayly), Hulda Lashan- ska.

"Country Dance No. (Edward German) and "Pastoral Dance No. 2 ard The Merry- makers' Dance No. 3', (Edward German), St. Louis Symphony Orchestra under the direction of Rudolph Ganz.

Minstrel Show Of 1929," Victor Minstrels, Males., voices with orchestra.

"Stand By Me" and "Leave It

"Largo" (Handel) and Pomp There, Pace Jubilee Singers

And... Circumstance — March with Hattie Parker, Mixed

(Sir Edward Elgar), Chicago chorus with piano.

and Symphony Orchestra (Verdi), Trovatore Selection

Grand Organ under the direc- Creator's Band, Glüseppe Crea-

tion of Frederick Stock, tore, Conductor. "The Kingy Kids Parade" (Gus: « Monastery.

Kahn-Walter Donaldson) and "Happy-Go-Lucky Days" (A. Wilson-James A. Brennan), The Duncan Sisters....

13

"Gypsy Love Song" (Victor Her

bert) and "Kiss Me Again (Victor Herbert), Renee Che- met; Violin Bolo.

"Memphis Yodel" (J. Rodgers) 1.15

and Lullaby Yodel" (McWil- liams-Rodgers), Jimmie Rod- gers, Singing and Yodeling with guitar.

Estrellita (Little Star)" (M. M.

Ponce) and "A Little Love. A Little Kisa" (Ross-Silera), Vie tor Salon Orchestra, Nathaniel Shilkret, Director.

By The Waters Of Minnetonka " Winnebago (Lieurance), 1.

Love Song 2 Love With Tears (Cheyenne)" and "3. Pueblo Lullaby; 4. Omaha Ceremonial," Thurlow Lieurance Clement Barone, Indian Flute with Modern Flute,

SSEN.

12.30 2:00 p.m.-English recorded

by music, t 7.00-11.30 p.m.-English.concert

and dance pro- | gruanme

Sundays.

11.00-12.15.p.m.Church relay.

Bells" Lefchure Wely) and The Mill In The Forest" (Richard Eilenberg), Victor Concert Band, Direction of Rosario Bourdon."

to. 7.15 p.m. approx.-Talk by

SHORT WAVE RECEIVER

THE ONLY SHORT. WAVE RECEIVER NOW ON THE MARKET THAT WORKS ON ALTERNATING CURRENT.

Tunes 14 to 500 meters. An excellent broadcast receiver as well as the finest of all short-wave instruments.

Particulars from

Dr. Cannon, M.D.: A Survey SINCERE'S

of the Cancer Problem."

p.m. - Experimental pro- gramme. At 7,30 p.m. approxi mately the following Victor re cords will be playede, Ar Wand of Youth" Suite No. 1 Part 3; 8. Fairy Pipers-Alle- gretto" and "Wand of Youth." Suite No 1. Part 46. Slumber Stear-Moderate" (Elgar, Op. la), London Symphony Orches tra, conducted by. Sir Edward Elgar.

Sole Agents

GROWTH OF RECEIVING LICENCES.

The following Agures illustrate the growth of local receiving Wand of Youth" Suite No. 1 licences. It is noteworthy that the

Part 5. 7. Fairies and Giants Presto". (Elgar, Op. la) and

:

1,000 mark" has for long been Minuet From Bean Brum-anticipated: as an: important mile..... mel (Elgar), London Sym-stone on the road of general accept phony Orchestra, conducted by. Sir Edward Elgar:

ance of broadcasting in the Colony:

Recorring Prelude In E Flat Minor" (Bach) and I Call Upon Thee, Jesus" (Bach), Philadel- phia Symphony Orchestra 12- der the direction of Leopold Stokowski,

12.13 1,00 p.za. Chinese program-8p.m.-Chinese programme.

pm-Evening weather report.

9.00-10.30 p.m.-Luglish program.

10.30 m. Close down.

January 1, 1929 (Broad- casting commenced from G.P.O: Build..

ing)

April, 1929 A

October 1929.(Opening

of Studio) January, 1000

April 9, 1030

Licences

204

515