1931-05-26 — Page 11

TUESDAY, MAY 26, 1931.

THE

HONG KONG

PENINSULA HOTEL;

BONG KONG HOTEL; REPULSE BAY HOTEL;

PEAK HOTEL

AND

SHANGHAI

ASTOR HOUSE HOTEL; PALACE HOTEL;

HOTELS,

LIMITED

In association with the Grand Hotel des Wagons Lits, Peking.

THE HARBOUR VIEW PRIVATE HOTEL.

9-12, Chatham Road, Kowloon.

Finest Situation on the Peninsula. Large Airy Rooms with Fall Benefit of the Cool Sex Breezen. Inequalled Cuisine.

Cable Add "Bazylow."

Phone

Tel. 36734.

Proprietress-Mrs. Gardiner.

MARBLE HALL

21. Nathan Rd., Kowlonn. Tel. 37089.

A Select Private Hotel furnished with an eye to the comfort of its Tenants. Single and double suites of rooms with private bath. Fonts attached.

K. FUJIYAMA

PHOTOGRAPHER

ANNOUNCES HIS REMOVAL

To

2, WYNDHAM STREET,

3rd floor.

DAILY CROSS-WORD PUZZLE.

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

16

21

1

2p

B

T

15

1Q

29.

24.

45

L

!

37

138 139

140 41

ゆん

I'm

1

143

142

129

53

まず

158

159

1

1

Ti

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HORIZONTAL.

1-Injury or losa 8-Volcanic matter 9-incite 11-Entense look 12-Couch

Y

14-Legislative group 18-Unusual

17-Checkered 19-Lacking warmth 21-Large dear

22-Tint

23-Negative

25-Regret

· 26-Parent 27-Ingrained

'28-Parlod of timo (pl.) 30-Diminutive suffix 31-Overawed

$2-Mad

34-Close by

-85-Costly

35-Disease of under

water workers

40-Bird

-43-Elicalation

45-Pointed missile

46-Exclamation

47-Exet

سکا

عليكم

¿HORIZONTAL (Cont.) 60-Prickly Bower-head 161-Not subject to

discount 62-Human being 63-Fatty tissuG

65-Cogitetea

57-Varlety

68-Conuine

co-Pull

$1-Paint

62-A unit of weight

81-Sang-bird 50-Cursos

VERTICAL 1-Bewilder 2-Universal mother 3-Tantalum (abbr.) 4-Mental Image B-For

example (Latin ath)

-The head (slang) 7-8capstone

0-Singing bird 10-Entranca

11-Festival

12-Mingla

4.

VERTICAL (Cont.)

15-Aids to memory 17-Unadulterated

18 Girl's nama 20-A cleansing

medicine

22-In what mannar 24-Label 27-Wearled

29-Took the part of 3;-Vehizta

32-Cosy room 37-Salze Buddonly 38-Musical instrument

39-Braco 46-Freshen 41-Long periods 42-Large container 44-Parlod of time 47-Tren covering

|49-Legal paper of

conveyance 62-Bewall

54-Darna! 50-Tart

167-Parceiv

160-Remiss

161-Prefix. Before

13-Railroad dining-car 53-Pronoun

48-Mure of length 15-Key to a mystery

ed that all facilities' have been pro- vided for Asiatic members. It la now decided that the society will be run by and for the benefit of the few enthusiasts who have support- ed the carly efforts. No persona who have been struck off the lists for arrears in subscription will be allow. ed to rejoin the society.

In brief, the Committee feel that the majority of the Asstic mem- bers want all the plums without climbing the tree to get them, and that, to put It plainly, le not good enough.

64-Weight (abbr.)"

YESTERDAY'S SOLUTION.

EAD PAIR

INNER

KEEN

OTS

HAI

IRD AM

IS AR RET.GRAND · ATE MEET OA ̈IRED RAINS TAMEDI

MEBS SAPS

THE CHINA MAIL.

RADIO TOPICS

COIL DESIGN.

The Effect Of Shape Discussed.

By N. M. Guddard, B.E.] Coll design is essentially a matter of compromise because of the large number of conflicting factors which had to be taken into consideration. Some of these are of a mechanieat mature, such as, for example, | physical dimensions, while others | are of an electrical nature, such as, for instance, the choice of a gauge of wire, an the relationship be- tween length and diameter.

In the first place apart altogether from size or shape, the choice of a Value of infuctarice which will be suitable for covering the required| waveband has to be made and in this the tuning condenser is the gov erning factor. although

stray capacities are the main considera- tion at the lower end of the wave band. The formulu from which the i resonant wave length for any parti- cular combination of inductance and capacity is shown at (2) below, the length being obtained by. multiplying 1885 by the square root of the product of the inductance (L) in microbienries and the capacity

wave

(C) in microfarads. For instance, to find the resonant wave length of n circuit consisting of a coil of an inductance of 200 microhenries with a condenser of 20005 mA in parallel. with it we multiply the two values, giving us 0.1. Of this we have to find the square root which is ap proximately 316, which multiplied of the constant (1885) gives us the wave length of about 585 metres.

re-

In a similar mauer, knowing the wave length and the inductance. a coil the necessary capacity to be placed in parallel to obtain

this wave length can be determined or

the capacity is known the quired inductance can be calculat- unt. Tuning condensers as a rule are of a maximum value of either; 0085 mid or .0005 mifd, so that it is generally a matter of determining in value of inductance which when ased with the condenser will cover the desired waveband.

TO-DAY'S PROGRAMME.

win

The following programme

broadcast to-day from the

Hong Kong Broadcastina Zimt me %.H.W. a wavelength of 958

metres,

6-8 p.m.-European Programme

of Victor Records,

6-6.27 p.m.--Orchestral. Phedre-Overture (Massonet),

San Francisco Symphony Orchestra (7154). Ping and Circumstances.-March

(Figan).

Royal Albert Hall Orehesten (9016). Finlandia (Sibelius),

Royal Albert Hall Orchesten (9015). 6.27-6.55 p.m.-Planoforte Solos. Nocturne a Rnguze (Schelling),

Ignar Jan Paderewski (0700). Nocturne in E Flat Major (Chopin), Mingel (Paderewski),

Sergei Rachmaninoff (6731). Caprice Espagnole (Moskowski), Bohemian Dance (Smetana),

Wilhelm Bachaus (7121). 6.55-7.13 p.m.-Operatic. Choral

Rigoletto (Verdi)

On Mischief Bent), Die Zauberfinte (Mozart)

(The Magic Flute),

Metropolitan Opera Chorus Violoncello Solo--

(4027),

Taonhauser--The Evening Star

(Wagner),

Die Meistersinger--Prize Song

(Wagner-Witaj).

Pablo Casals (6620).

Orchestral-

Tristan and Isokde-Preluda

(Wagner).

San Francisco Symphony Orchestra (6585). 7.13-8 p.m.—A Concert. violin Solo-

Minuet Haydn-Hartmann), Nocturne

Song

(Tschaikowsky-Hartmann),

Renee Chemiet" (6609).

Clair De Lane (Moonlight) (Szuic). Swing Low Sweet Chariot

(Arr. Burleigh),

Dame Nelli Melba, Sopranɔ (673)). String Bass Solo-

Chanson Triste (Koussevitzky).

Serge Rossevitzky (7159).

Love's Old Savet Song (Biighans-Molloy),

SINGAPORE WIRELESS SOCIETY,

Defaulters To Forfeit Membership.

Rather drastic action, has had to De adopted by the Committee of the Singapore Amateur Wireless So- ciety, on account of the lack of sup- part shown by the majority of the Asiatic members. Subscription fees have not been paid by a large number of those who signited their intention to join the Society and who, in view of their attendance at the initial meetings which wore held, were duly elected members of the Society when it was formed. It has now been decided to give all defaulters a month's notice calling upon them to pay up or forfeit their membership. The action was taken at a recent meeting of the committee and definite instructions were given to the honorary treasur- er to notify the defaulters and give them a month in which to pay their fces. After the period of one month, if the subscriptions are still unpaid, membership will cease.

Melody Mike Fan Mail

11

rom the far northern prairies, letters were received and from' from city, town, village, isolated 15,000 In a month the figure has farm house, right across the Domi- risen to close on 40,000. Photograph nion from Halifax to Victoria, shows a portion of the radio depart- letters are pouring into Canadian ment staf dealing with this huge Pacific Railway radio offices at

Montreal from admirer of the fan mail as it comes in each day. genial old soul who sends out his The Melody Mike feature is de message of goodwill and kindly clared by competent judges be humor every Monday night. In one one of the most popular radio day in March no less than 1361 such offerings on the contineat.

special lectures, but those for whom A Series of Lectures.

the lectures were intended failed to For the benefit of novices whose display any interest. It has now knowledge of wireless is not suf- boon decided to arrange some inter- ficient to enable them to understand esting technical lectures for those lectures for the average enthusinst, enthusiasts who have turned up and the Society arranged a series of Hupported the Society.

H

The Asiatic members of the So- ciety are apparently not showing the keenness and interest that was expected of them. The Committee note this lack of support with re- gret, especially when it is consider. (Continued at foot of Column 1.)

HONG KONG MARKET PRODUCE.

APPROXIMATE RETAIL

Exgs, Hen (cooldag)..

新炸翔

per doz. 23

40

31.

海甫期

16

24

PRICES.

May 13, June, June,

May 13, June, June,

Butcher Meat.

1981. 1018. 1914. Cla. Cts. Cls.

Poultry,

1931. 1018. 1014.

Cts. Cia. EN

Beef Sirloin

4 lb.

#3 24 12

Chickea

b.

GO 30

31

14

Prime Cut

30 28 11

Capont, Small

» Corned

58 M

80

—

23 12

+1

Capons, Large

r

60

30

Boart

13 24 22

" Breast

30 20 18

Dock Dovec

45

21

11

Inch 45

21

Soup

20

27

18

" Steak

13

29

ERK, Hon (fresh)

20 20

"

40

30

35

Fowls, Canton

36

28

20

per set 17

Fowls, Hainas Goela

24

24

24

each 15

GO

-

60

,, $1.20

24

-$1,20

14

*

Hemp, Sali

·18

Foot

"

cach là 10 12

Snipe Pheasant

"

Kidneys

15

12

Tail

27

22

Quail Partridges

P

Livor

ib. 24

14

Tripa

A

7

Shing

Calves' Head & Foot set $1.50 $1.00 $1.00 Mutton Chop

Fruits.

lb. 44

44

40

John McCormack, Tenor (6776).

Piano Solu

Impromptu in A Flat (Schubert),

Sergei Rachmaninoff (6621). Guitar Solo-

Theme Varie (Sor), Song-

Andres Segovia (6766). Louise Bergeuse (Charpentier), Jungleur de Notre Dame (Massenet) (The Juggler of Notre Dame).

Marcel Journet, Bass (6785). 8 p.m.-Local Time & Weather Report.

8.05-11.30 Theatre Relay.

p.m. - Ko

13.30 p.m.-Close Down,

For the best results from radio frequency circuits corlain condi- tions must be fulfilled.

For in- stance, the efficiency of neoil at low wave lengths is determined by the r.t. resistance of the coil which is in turn determined, to a large ex- Lent, by the dielectric losses in the wire and the former upon which the eo is wound. Un the other hand at the higher wave lengths the com- bination is more effective when the inductance bears

a comparatively large ratio to the capacity. There fore, if the best is to be obtained from a circuit at the wave-lengths above 400 metres, coils of large in- diactance should be used, which means that the capacity in parallel disadvantage, but is in fact, to bo with It must be reduced.

proferrel, because stability is much more easily abtainable. condition at the lower limit of the point is of particular interest to This band must be considered.

the manufacturer. denser, although set

For example, al zero, still

suppose that for various reasons of relatively in-

But the

A con.

is to be reasonably good.

Estimating Inductance.

With modern valves this is not a

Steak Sirloin ...

Sausages ...

Bullock's Brains ....

Tongue, fresh Tongue, corned j

Head

Heart

OF

Leg...

Shoulder

2)

Sridha

Pig's Chitlinga

Braing

"

Fest

"

to

Fry

"

Head

Heart

m

Kidneys

Liver

Pork Chop

Log

Loin

Fat or ard

has an appreciable amount of such as the use capacity, the

amount depending efficient coils, shielding, r.f. trans- Sheep's Head & Foot .. upon the quality of the components, formars of low step-up ratio, etc., while valves, valve sockets, wiring, etc. all provide their quota of capacity, which means that in the

the amplification

per stage, even with efficient valves, is kept down to 30, the overall amplification from

at

J

Heart Kidneys

Liver

| aggregate there is a fair amount al three such stages is approximately Sucking Pigs, to order:

ways there.

27,000 times. For an equal amount of amplification in two stages ench would have to amplify about 365]

tF

Veal

20

Sust, Beef ...

Mutton

Sausages

No. 1.

Fish

Canton Fresh Water F

80 Carp

The precise value de peuds upon the care with which the parts have been laid out and the quality of the components; but

times. There is a vast difference it is unlikely in the average case that there will be

between the control of the two types Iesa than

of circuit. .00001 mifd,

Where the amplifica- while It Is more probable

tion is high the tuning circuita must that there will the about .00005 mfd.

be of low resistance, which means Barbel If this value is assumed to be present, and that sharp tuning and possible loss Braam

of high notes, careful construction, the coil of 200 microhenries, men difficulty in ganging the circuits, tioned above, is used, the minimum and decoupling are necessary, wave length will be 190 metres. A that a little stray reaction may not Catfish coil of this value is, therefore, sult-set up oscillation. The set with the able for covering a waveband of 200m to 550m with a .0005 mfd con- low gain per stage is more easily Grabs

stabilised and ganged, while it gives Cuttin Fisk almost equal selectivity and sensiti. Dab In the same way, the effect of

vity, although with not auch great Dace other coil-condenser combinations

economy. can be calculated. A wil of 250

Dog Fish For such a set as this coils of Zola. Conger microñenries, for instance, with a abort 200 microhenries may be 00035 mid condenser, will cover a used, and wound with the turns band from about 197m to 570m, and, touching. For example, on a 11⁄2- Frog...... 90 turns of No. 28 Garoupa `ë-

Gudgeon

denser.

Codfab

Fresh Water Yellow

provided that stray capacities can be inch former kept down to reasonable figures. itd.s.c. will produce a coil of the re- is a better combination than the quired size, but if the former la 1% first mentioned; but as there is al- tch the turns will be reduced to 78. Herrings

ways a doubt about the position at

Kalbut

Lobaters

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Pigeont, Canton

Holkon

Turkeys, Cock Turkeys, Hon

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Almanda

Appies (California)

30

Bananas (bride's)

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Carambola

金山郊業 燕山香薇 # 憾

71

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Beach

28

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Lemons, China

18

# 18.

20

藏室

each

16

10

Lemons (American)

ench

13

10 "

Llebres, Dried

**

11.

85

1b.

43

24

Oranges (Canton)

**

23

·

37

Oranges

新作品班 辔

40

$1

12

70

Pear (Canton)

26 · 21

P

Peanuts

72 生

per ret 30 - GO

70

each 12

7

Persimmons, Large

**

13 12

10

Plantain

* 離 * *

21

*T

+$

25

21

42

Pumelo, Siam Walnuts

20

18

# 18 15.

20

Grapes

22

20

28

Vegetables, &c.

# each 12

1.

5

8

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12

24

白鸽

J

28-68¢ e daudzduecasetadegayus29Y=441A

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Artichokes

Beam, Sprout

Brinjals, Green

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Horseradish, Shanghal

Indian Com.

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Beet Root

Bitter Squash

Fiah 糖裁

13

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Red

16

27

Cabbage, Chinese

0

(Shanghai)

17

Cane Shoots, bunch

20

27

23

16

10

Carrata

10

8

Celery, Chinese

10

Chills, Dried

10

8

Red

บ

20

30

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32

25

Curry Stuff, English.. #

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Cucumbers

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Garlic

13

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Ginger, Young

16

Old

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21

Lettuce

20

Water Chestnuts

2

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45

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Parsley Potato, Sweet

Украдево 日本

Ray

10. 14

Rock Flab Boach

18

10

Radish

Valmon

80

Sbark

18.

10

Shalists

Skate Shrimpa Snapper ly long coils of small diameter may variations of Inductance will be

Solea be used, whereas if only a few tuned caused by variation in the spacing Teck circuite are to be used colla of larger of the wire or of the thickness of diameter are necessary if selectivity, the insulation.-Sydney Telegraph.

10

Spinach

52 32

80

#

Tomatoes

"

40 28

28

Tares....

28

#

Turals, Punti (Long)

20

85

**

Vegetable Marrow

Turbot

左口您

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29 12

12

Water Cross Dark

Turtles, smalı, Ér, wester.

1.00

Water Lily Ecot

ed,

because there is

The expression given above at (1) the lower end of the band, an inter is an empirical formula for deter- Labrus mediate value of about 225 to 230 mining the Inductance of a coil when Loch microhenries is generally to be pre- nnce its dimensions and number of ferred.

turns are known. It is only an Mackeral Having settled the proper value of approximation, but It is reasonably Monk Finb inductance, our troubles are not end- accurate, provided that the length Mullet no zimple of the winding fe more than one and Oyster formula by means of which the a half times the radius of the coil. Parrot Fish diameter, length of

Perch winding, and The length of the winding in

Pike gauge of wire for a given Induc- inches is shown by 1, while r is the tance can be determined. There radius of the former in Inches, and Plaice are numerous approximate formulae N is the number of turns in the Pomfret, White of a fairly simple type, but always winding. The winding of the 90- it is necessary to take a coil of cer- turn coll mentioned above occupies tain physical dimensions and work about 1.6 inches (found from wire

If it is neeas- tables). out its inductance.

Applying this length (1), Bary to conserve Bpace," a small the radius (r) of one inch, and 90 diameter must be chosen, but colls turnis (N) to the formula, we find, of this type are not as good as those as a check, that the Inductance is of large diameter. If a set is well; 199 microhenries, which is suf supplied with r.f amplifiers relative- ficiently close. because greater

公班

DA

€6693

21

"

#

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20

80 :13

Mushrooms, Frosh

American

Pumpkin

Rhubarb (Fresh)

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