1928-07-03 — Page 10

10

Newly Arrived Ladies'

Bathing Suits Bathing Caps Bathing Shoes

In Big Selections and at

Very Low Prices

YEE SANG FAT CO.

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THE

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BUSINESS DIRECTORY.

Bookbinders.

THE "CHINA MAIL," Book-

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Dentist.

HARRY FONG, Dentist,

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Ladies' and Gentlemen's

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(opposite Queen's Theatre).

Central Tel. Central No. 1255. Hair Dressing Saloon.

Electrical Supplies.

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72, Queen's Road, Central. Tel. C. 8270.

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W. S. BAILEY & CO., LTD.,

Engineers and Shipbuilders,

Kowloon Bay. Now Work & Repairs.

Call Flag "L" Sole Agents for Kelvin Motors.

FOR SALE.

SCOTT-SEALED PACKETS Guaranteed to contain GENUINE STAMPS ONLY Sealed by Scott for Safety and

All Packets Sold by us carry their "Unqualified Guarantee." You can be sure that every Stamp in the Packet is listed in Scott's Standard Catalogue..

GRACA & CO. Dealers In Postage Stamps, : Garden Seeds, Pictorial Post Cards, Toys, etc.

No. 10, WYNDHAM STREET, F. O. Box No. 620. HONG KONG

HANSON SKEY,

Ladies' and Gentlemen's

First Class

THE CHINA MAIL,

RADIO TOPICS

RADIO NOTES.

CHINA BROADCASTING - ASSOCIATION,

A

chances there are of introducing is used with a good choke, less than distortion. The simplest solution | 1-100,000th of the radio-frequency of volume control, therefore, is a current will go through the choke variable high resistance phunted to the B supply circuit. across the antenna and ground The shielded grid type tube has binding posts of the receiver. This a mu or amplification constant of The following letter recently aparangement may be applied to any about 50 with respect to the plate. The variable resist This means that any radio-fre- peared in a Shanghai contempor existing set.

ance may be mounted on the usual quency disturbance in this cireult Sir. The letter re Broadcasting panel, or externally yet near the is amplißed 50 times in the plate volume control circuit. Needless to say no coup- signed by Mr. Parsons is rather receiver. ambiguous. How can he have re rheostadt (200 ohm-2 magohm)ling can be permitted through the ceived Big Ben striking the hours will be found well suited to this supply circuit to the shield. To of 11. p.m. and 12 pm at 5.10 a.m. purpose, with a wide range of re-overcome this the current through Shanghai time? There must have sistance in several turns of its the shield should be supplied been an interval of one hour. Both knob. This arrangement is applic- through a resistance which has a could not possibly come at the same able to the latest A-C tube sets, and low capacity between the terminals time.

offers remarkable control of volume and which, la non-inductive. It Chelmsford England is not 2. S. without introducing distortion. It must have a constant résistance to W. it is 5 S.W.

also has some influence on the aen-prevent "frying" noise which would result from changes in current in sitivity of the set.

this circuit.

ол

It may interest your many Radio enthusiasts to know that the Bri tish Broadcasting Corporation are transmitting short wave (42 meters) the programmes of Daven- try which is 5XX relaying them daily from 7. pm. until midnight and that it is comparatively easy to hear same by using à 4-valve set with loud speaker the circuit being the well known Schnell,

After several listening "Ins" on more than one circuit I have not been able to hear the 11 o'clock hour strike, but I can distinctly hear the midnight hour and "This is the Chelmsford Station, Great Britain, closing down for to-night Good-night everybody.

I am, etc.,

Reggie Broadley.

PROGRAMME HEARD FROM RADIO STUDIO..

A flying radiocasting studio! A bigger and better thrill for radio fans!

Many thousands of eager listen- era in America, kasped with astonishment one night when, after enjoying the syncopated strains a a late dance melody; their loud speakers announced that the, pro- gramme to which they had been Ilstening was being radiocast from an aeroplane elreling over the city of Los Angeles at a speed of 100 miles per hour.

For what is believed to have been the first time, an aeroplane and a radiocast were successfully united. Another advance step in the rapid progress of those two creations of modern ingenuity was inscribed upon the pages of natural scientific history.

From the earth, those who were attracted by the throbbing of the three powerful motors saw only the lighted windows and red, white and green navigating lights as the great fire transport circled over the city.

Excellent Reception.

At an altitude of approximately 2,500 feet a one-hour programme of unusual merit was radiocast which, according to reports, camne through with all the quality of a regular studio radiocast.

Why Not a Tone Control?

We hear much regarding a suit- This circuit should preferably be able volume control, but very little supplied through a 2,000-ohm resist- A by. about a tone control. Yet the lat-ance, of the leak type. ter is almost as important as the pass condenser of 5 or 1 mfd. There are times when we should then be connected from the former. want sharp, crisp reproduction, G terminal of the socket, which such as for speeches, band and jazz goes to the shield grid, to the nega- selections, and weak signals, while tive flament lead, at other times we

Coupling through the grid circuit Want mellow, soft, entrancing vocal and instruis much more difficult to eliminate. A tone control, A common C battery or source of mental rendition. therefore, is necessary to remove blas should not be used if this can the higher frequencies which are be avoided. If one is used, the grid responsible for the sharp, crisp and circuit should be fed through a 1 usually disagreeable quality of megohm leak and a 5 mf. condenser some loud-speakers. The simplest connected from this lead, at the tone control comprises a volume point it enters the shield, to the control rheostadt (200 ohm-2 negative filament terminal of the! megohm in scries with a 4 mfd. tube. condenser, the combination being shunted across the loud-speaker In- put. Turning the knob of the of copper with all possible seamna rhaostadt serves to increase or desoldered. The top should be crimp- crease sharpness.

ISOLATION IN SCREENED

GRID CIRCUITS.

Probably no tube has created as much interest as the new shielded grid. This tube, with its promise of greatly increased amplification at radio-frequencies, has caused an unusual

of discussion among set builders and experi- menters.

amount

J

The experience of a host of ex- perimenters indicates quite defir- itely that any real improvement In performance can only come as result of careful design and a strict attention to the characteristics of the tube. If it is merely subtituted in the present receiver poor results will inevitably result.

Those who have worked with the tube for some time, that is to say a year or more, while it was in the experimental stages assure us that nearly all of the problems can be summed up in one word "isolation." This Isolation cannot be made too complete due to the sensitivity of the tube and the high amplification per stage that may be obtained.

Shielding.

I The shields should preferably be

ed so that it overlaps the sides both inside and out by of an inch. The cans of the by-pass condensera should be grounded to the shields and they should be mounted so one terminal is adjacent to the battery lead, to which it is to be connected at the point it enters the can.

All

The control grid lead should be carefully shielded if it passes from one compartment to another. leads should be made as short and direct as possible..

-shunted

TUESDAY, JULY 3, 1928..

DAILY CROSS WORD PUZZLE

(This cross-word puzzle has been made by an expert but our readers are warned to look out for occasion phonetic spellings, such as harbor, plow, and altho.)

37

1441

42

..

.....

128-

19 130

192

35

136

་

39

46

明

50

51

| 52.

153

54

58

56

57

58

• 59

50

161

62

165

186

167

69.

70

71

72.

VRIZONTAL

3-An English *

lexicographer

B-A city of Palcetine

whore walls fall before Jashn

11-A seaport, 8. W.

Finland

12-A person whose

mental capacity has been arrested 13-Pronoun

14-TA bend

15-A projecting point 16-A little 13-Prefix. Before 19-A prickly flower.

head 20-Obscura

22-Received

25-Combining form.

All

27-The note of the

dove

28-A musical note 29-Article

31-To band downward 33-An English poat 35-An English cardinal;

chancellor under Henry VII 37-Conjunction 39-Mother

40-A current of air 43-An Infusion used medicinally 45-The 8 American

astrich 45-Nothing 49-An Island, Butoh

*** Idles

-THE INTERNATIONAL JYNDICATE.

VERTICAL (Cont.) |16-To project

HORIZONTAL (COOL) | 51-Quite

62-A tropical American 17-To cant

parrot |64-To sing with #2

tromor

|57-Irregular (abbr) [58-A gap in a ridge of

hills

60-A signer of the Declaration of Independence

33-An entrance closed

with a gate · 86-Anger

37-Great sorrow

88-Girl's name

6-A constellation

4

19-A blessing [21-To assombla

22-A PortuguÆRE

aolony, W. coast of Endta

[23–Te apoll•

29-A part of the face [24-No (Boat.)

27-A jester. (28-Because

[80-Name (French)

82-Having a circular

motion

94-A dowry

30-A Ramen household

70-Ta string on a stick; cod

|71-An English general who captured Queboo

172-A stay

VERTICAL,

1-To poke 2-A municat

Instrument

4

in what manner 4-A Perelan poet

-A square block of

woed

-&-A Bible character;

the type of patlance

7-A lady of King

Arthur's court

S-A paliceman

(alang)

9-Damage

10-Pxolfic const Blato

(abbr.)

(33-To write

41-Purpos

42-8anse of mali 43-A marble |44-5omething done

48-University town in Central & Prussia 47-A mézsúre of length |46-Largo, single-blade

pocket-knife

50-A vaulted

DABEREOWAY

63-A black bird 85 The Gresk f 66-To cavi

69-A gambling gants 60-Prefix. On this side |61–A Brazilian coin

[R-Lion (Latin)

|53-17° (Guat.)

64-Strife

15-One of the

Caroitne, Inlanda

(The solution of the above cross-word puzzle will appear in to-morrow's issue along with a new cross-word

puzzle.).

In addition to the precautions mentioned all possible precautions should be taken in an eliminator, if one is used, to eliminate the com- mon coupling impedance. This re- quires that higher capacity, high quality condensers be across the various B supply leads in! the eliminator. In such a case the condenser requirement for mini- mum hum or modulation no longer becomes the controlling factor. Of much greater importance is the A "FLYING SQUAD.” elimination of sources of coupling through the supply.

REGIONAL RADIO.

HOME POST OFFICE SANCTION.

The Postmaster-General bas sanc-

The isolation usually includes thorough shielding to eliminate the coupling which might occur through Between numbers on the pro-inductances and capacitances, and tioned the erection of the first of gramme the musicians looked down in addition to this; complete iscia- the new highpower twin-wave sta- from the windows of their luxurl- tion of the battery supply circuits. tions contemplated by the B.B.C. in ously appointed flying studio upon Some work along these lines has its regional scheme.

Flashing electric signs in many be taken. vivid colours gave the impression of a widespread fireworks display out of its element.

B.B.C. "HUSH-HUSH"

VAN.

OUTSIDE BROADCAST LINK.

YESTERDAY'S SOLUTION.

GRAB SHAW

MANLI — AWAYU DAYTON FRENCH DON ENCMIES LAD SNAP GADNS RECY LEGAL TRE RIPEN E £OAD € SECTE

JOHEN SASH

IDAM C TEXAS CUB TAPS CARE; OSE TANGAR

ENDIVE MILE

DARE HAIR BEST FEND

The British Broadcasting Cor- poration has just acquired a "hush- huah motor-van for use in connec-

Although the exact purpose of tion with outside broadcasts. a fairlyland metropolis. Long been done with receivers using the .The B.B.C. issued an official state this van is at the moment a secret, rivers of flowing light marked the old type tube. All of these things, ment to this effect adding that the it can be said that it is not to be

It is to coutafu GREATER BRIGHTON. crawling movement of thousands of greatly refined must be applied to new station is to be to the north a transmitter. motorcara plying the crowded the new type tube, and other pre-of London, and it is anticipated that amplifiers, and possibly some form

The Brighton magistrates have thoroughfares in all directions. cautions peculiar to this tube must it will be ready for service within of portable microphone, to link with

from twelve to fifteen months. the nearest telephone exchange.granted an extension of the The British Broadcasting Corpora-licensing hours from ten to eleven Work will begin shortly. Shield Grid Needs Impedance. No coupling must be permitted The object of the B.B.C.'s regional tion will therefore be equipped with every night in connection with through the plate circuit. To avoid scheme is to provide alternative or a sort of "flying squad" able to con- the Greater Brighton celebra- The chief constable opposed the On a far summit of the north this, à radio-frequency choke must contrasting programmes for crystal vey all the apparatus necessary for tions. hills a beacon light marked the be introduced into the circuit to listeners over as wide an area as an outside broadcast to any spot at

application, saying that he con- sidered it was unnecessary and midnight trail of the air mail, and give the high Impedance or choking possible. This aim, it is believed, short notice,

Such a van might be convenient-

undesirable. in the distance as far as the eye effect necessary, and a high-grade can be best attained by the erection

After a retirement the magia- could reach clusters of twinkling by-pass condenser to provide the of five twin-wave high-power trans- ly used for broadcasting the song'

A dif- of the nightingale, or descriptions trates announced that they real lights indicated the position of alternative low-impedance path to mitters at suitable centres. neighbouring cities and towns the radio-frequency currents. To ferent programme would be given and news stories where advanced ised the occasion was a very im- on each wavelength. The number preparations would be impractic-portant one for the borough, and where in many homes radio sets Insure effective choking the choke were informing their listeners of should have a very low distributed of exclusive wavelengths allocated able. In the case of sporting broad-in these circumstances the appli- to Britsin under the Geneva plar casts the British Broadcasting Cor-cation for extension would be this latest step in the advancement capacity, and a choke having a

capacity of three microfarads may restricts the number of projected poration engineers should be saved granted. THE HONG KONG OPTICAL CO. of radio and aviation progress,

considerable trouble. As the van stations. 'Phone 2232.

Nice, Yesterday. The death is Many high capacity paper con- One of these five stations will will need a land-line its use will be densers which are satisfactory at serve South-Eastern England, and somewhat restricted, but the pos- announced of the American play low or power frequencies are en- this is the one the B.B.C. is now sibility is suggested of one equip wright, Avery. Hopwood. Mr. The most satisfactory volume tirely unsatisfactory at radio-fre about to construct to the north of ped with a short wave transmitter, Hopwood, who was 44 years of age, control is one which controls the quencies. Imperfections which are London. It la probable that the site the land equivalent of the British was best known as the author of radio process as soon as possible not evident when using direct or will be somewhere near Potter's Broadcasting Corporation's boat-"The Bat," the "Gold Diggers," and In other words, the nearer the an- low-frequency alternative current bar, but its exact location, together race launch. A mobile British "Fair and Warmer." He was seized tenna end one begins to exercise become very important at radio with other detalls, such as the wave Broadcasting Corporation station with cramp while swimming at

lengths to be used and the power, would make new programme fen- Juan Lespins and was drowned. control, the better, while the nearer frequencies.

tures practicable.

Hair Dressers.

45, Des Voeux Rd. C., H.K

Optician.

53, Queen's Road Central.

Printers.

“THE CHINA MAIL," General

Printers.

Publishers and Bookbinders. Ja, Wyndham Street. Tel. C. 22.

MOTHER- DEAR. DADDY'S ON THE PHONE HE WANTS B

| TO TALK TO YOU

be used.

A SIMPLE VOLUME CONTROL FOR ANY SET.

-

the loud-speaker end, the more If a 1 mfd. by-pass condenser, ai not yet settled definitely..

CH. TELL HIM I'M TOO BUSY HE KNOWS BETTER THAN TO CALL ME AT THIS HOUR WHEN I'M GETTING

READY FOR MY SOCIAL DUTIES

IF. HE CALLS (AGAIN WHA” WILLI SAY?

-BRINGING - UP FATHER.

TELL HIM I WENT TO CALLI ON MRS DE RAIL: COUNT- EMOUT IS GOING TO PASS HER HOUSE IN HIS AUTO AND 1. MUST GET A

GLIMPSE OF HIM:

0 1922 by fat), Fanture Service.

• Gras Batuak right anmurred

5 23

COUNT WOULD YOU LIKE TO HAVE SOME CHOP SUEY: FIRST OR SHALL WE

CALLON-DINTY

MOORE?

Router.

AS YOU SAY- PM IN YOUR) HANDS SORRY YOUR WIFE

WASN'T IN. WHEN YOU

PHONED