1930-05-20 — Page 11

TUESDAY, MAY 20, 1930;.

KITCHENER'S

DRY, and OLD TOM GIN

Approved and

OPECIAL DAY

Buried & Settled Wilbank Distile

Recommended

:

by the

BRITISH

ANALYTICAL

CONTROL.

obtainable everywhere.

Local Distributora:

H. RUTTONJEE & SON.

HONG KONG.

Job

PRINTING

Our business is to create beauti- ful printing. Typography, choice of stock →

every element that makes for more attractive book- lets, folders, etc. is produced here with the care that spells success. Exact estimates of cost. are offered on each job, regard- less of size.

THE NEWSPAPER ENTERPRISE LIMITED

CHINA MAIL OFFICE 3A, Wyndham' Street. Hong Kong.

Telephone

20022.

DAILY CROSS-WORD PUZZLE.

(This cross-word puzzle has been made by ́an expert · but our readers are warned to look out for occasional phonetic

spellings, such as harbor, plow, and altho.)

(

13

12

15

23

|24

30

34

41 42

16

13

9

26

27

28 29

32

36

138

40

149.

48

50

JP

541

5%

$5

HORIZONTAL,

1-Mamber of the

Aryan, family -Citizen (abbr.) To engage In

boxing 12-Animai'm don 13-Goddess of malto-, loun mischiaf

|_ HORIZONTAL (Cost} |-/VERTICAL (Cont)

44-Feminine ́nama.

| 45–Terminates :

48-To place in some--"

thing

| 49-A mountain In ·

Armenia 50-LookÉRA

| 61-8mall lizard

14-Central mala figura | 63-A portion

Bad in a playing 2.84-Proofin

16-Alur.

16-Diminished

-17-Apportion poten

18-Char

20-A lump A -21-Aiport abroad

23-Flat-bottom banta, 26-Resembling yenet --30-Aral –(abbr.) Nags

31-One (Book) (32-Talongirofix,

B4-Bewing Implement ; -37-Highest partidos 89-A mixture of snow- Me or hall and rain

88-Scotch river 68-AboundTM

A VERTICAL

1-One of various hi-

valve mallusks Z-Comfort

19-Flower leaves: 10-Greek god of war

| 11-Measure of length ((pt.) |

18-Part of verb “to be” 21-Staggern 22-Disprove 23-Edlot 24-Exles' 25-Ramble 27-Goal*****

26-Profix-three 29-Bealdea

| 98—Effacen 36-Exalted 37-A legislative body Filth President of

the United Staton.

40-Half an ema

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48-A support and gene -Founder of Theben 45-Point of compása. 6-Pronoun COSTA 46-A lädy 77-A'smalt tires or ))?|| 47-8tock of witres": We four tagged lakte::" 82-Chemical symbol.

Fike for fron

*(The solution of the above, cross-bord puzzle will contar in

to-mor

along with a new orosa-word puesis.)3

THE CHINA

RADIO

RADIO'S

SILENT

DETECTIVE.

EFFECTIVE HINT TO FORGETFUL.

RUSH FOR WIRELESS LICENCE.

The Wireless Correspondent of the London Daily Telegraph under- stands that the Post Office radio detective van is displaying great activity these days.

MAIL.

TOPICS

RADIO

TO-DAY'S PROGRAMME,

The following programme will to rondsust to-day from the Hong Kong

Broadcasting Station Z.B.W. on 355

metres:-

6-7 p.m.-European Programmg 7-7.30 p.m.-Lesson in Canton ese by Rev. H. R. Wells.

7.30-8 p.m.-Recorded gramme.

"The Drage Way"

It appears to be the policy of the Post Office to inaugurate cam- paigns in various districts for the purpose of rounding up "radio pirates" and, incidentally, to act as a significant reminder to those wireless listeners who have falled to take out licences, not because of any Intent deliberately to evade paying the fee, but-as is often the case- because the matter has entirely "Suite Francaise" (Foulds), escaped their memories.

The Band of H.M.

stream Guards. Many New Licences. Recently the van was in Manches-"Fountains of Rome"

Pro-

(Clarkson Rose), "Iomen" (Weston & Lee),

Norman Long, Humorous

with Plano,

at Dawn,

No. 2-The Triton Fountain at

(Respighi),

EMPRESS OF ASIA.

Music Broadcast to All Parts of Ship.

The Empresa of Asia la now under the command of Captain L. D. Douglas, R.N.R., who has succeeded Commander A. J. Hailey, R.N.R.

Commander Halley is remaining in Vancouver awaiting to transfer to the Empress of Canado. Through this change A. V. R. Lovegrove, D.S.O., R.D., R.N.H., again takes over the duties of Staff-Captain

During the ship's stay in Van- couver a microphone system was in- stalled whereby the music from the ship's orchestra may be broadcast to all parts of the vessel. By this means the music is splendidly. re- produced in all public rooms, Second Cold-class passengers now enjoy the

Giul

ship's band to the same degree

as those travelling first class. If desired the machine can be converted

Into a Victrola, and the records also Morning this improvement in all the ships broadcast. The company are effect-

of their fleet,

London Symphony Orch.

ter, and, although the direction No. 1-The Fountain of Valle finding apparatus is supposed to be capable of locating asta which are uscillating. It seems that the Post Office rely more upon the actual ap- pearance of the van than its techni- cal efficiency. The sight of the vant in Manchester is reported to have scared quite a number of people who had obviously not taken out wireless licences.

8 p.m.--Chinese Programme re- layed from Ko Shing Theatre until end of play.

OVERLAP.

ABOUT ELIMINATOR CONDENSERS.

A condenser for use In ди The van paraded some of the main

eliminator circuit must be of re- streets, attended a football match,

liable make. Secondly, it should and made a round of schools, fac-

have passed a voltage test of at tories, and business houses. The

least twice the maximum voltage resuit was clearly indicated by the

which it will be called One trouble which is not very withstand when in daily use. Ac- upon to rush on various post offices. It is clearly understood atuted that the Post Offlee report amateurs is the reaction irregular-maximum voltage equal to twice

by many

tually a condenser is tested at a shows that the number of newly known as overlap. To properly the voltage it is intended to work licences taken out in the Manchester explain overlap you must imagine district per week averages an in yourself operating a set which, crease of 30 per cent. above the when the reaction condenser set- normal figure.

break lato oscillation at a certain ting is gradually increased, will reading, and will stop again at the same reading when reaction is again reduced.

It is a peculiar fact that radio is the only licensed pastime which affords the Post Ofice authorities any scope for creating a moral effect on backsliders.. Considerable specu- lation has been going on in certain circles as to what would be the effect if the Foat Office did by any chance Invent

contrivance which would detect people who had not paid, for example, dog licences, gun licences, and so on.

gome

LE CLANCHE CELI BATTERIES.

It must be admitted that the commercial type of wet Le Clanche cell, which is used for, working electric bells, is absolutely unsuit- able for use in wireless sets, auch as for lighting the filament. This cell is designed to supply a moder- ate amount of current-about 0.25 to 0.5 ampere-for a second or so at fairly long intervals. In this cell a. slow-acting depolariser is used and if the cell is placed on circuit for any length, of time the voltage falls off rapidly.

The Le Clanche cell used for wireless reception is the heavy- duty type. In this the negative electrode takes the form not of а rod but of # cy. linder, and instead of a porous

| pót a sac filled with a quick-acting depolarising compound is fixed round the carbon electroda. Al- though these cells give fairly antis- factory results there are, however, certain points which require at- tention. Zine as first produced from the ore contains a large pro- portion of impurities and it la ex- ceedingly difficult to refine It Into a pure state.

Since the impurities are largely composed of other metals, Immer- sion in the electrolyte causes what is known as local action to be set up. even when. the battery is on open circuit. We may, in fact, res gard an impure zinc plata as collection of a vast number of tiny cells each of which is generating current when the metal is placed In a sal-ammoniac solution.

♫

Current, cannot be produced in the primary battery unless some, thing is consumed, any more than heat can be produced in a boiler without the burning of fuel. Every cell Is a little furnace In which alne la burit instead of fuel. When local action takes place the zine is rapidly destroyed. Luckily, there is a way of minimising it. If mercury is allowed to run over a clean zinc surface It combines to form an amalgam. But it is only. the zinc upon which it acts; it will. have nothing to do with the other motala When, therefore inc rod or cylinder has been amal gamated, It presents always to the electrolyte a surface of pure zinc. Local action is thus minimised and the life of the zinc is greatly pro- longed. It follows that in any wet Le Clanche cell used for filament heating purposes the zinc element should always be thoroughly amal- gamated before the cell is charged.

This can be done by placing it for a short time in dilate sulphuric acid, washing it well and then zun- ning a little mercury over a sur face Attention to this point will lead to very great economy in the matter of zinca

at.

Thus a condenser in an elimina-

teated at 400-volts D.C. Whether tor circuit which is required to serve under 200-volte maximum is this is a large enough factor of safety is a point open to question. condensers at twice the normal Even the practice of testing the

In

For example, if you find that the set goes into oscillation as the re-working voltage is not always a action condenser passes the 50 de-

solution satisfactory

to gree mark, this will cease

the when

problem of a condenser breakdown. the condenser passes 50 degrees as you bring it back. That is what

When, for listance, the circuit really happens in a set when it is broken, we have peak voltages set the eliminator is suddenly behaving properly. In one which is afflicted with overlap you will up which are applied across the condensers in the circuit: with And that, although it might go many eliminators the voltage thus into oscillation as the reaction con developed may be as much as three dénser reaches, say, 50 degrees, it tion is slackened off to perhaps 45 have been designed to withstand will not stop again until the reactimes the normal voltage. Unlesa, therefore, the condensers employed degrees. The two points overlap these sudden rises, a breakdown hence the name.

will be the inevitable result. allow for such emergencies the factor of safety should be more than two and preferably in the neighbourhood of three at least.

Where the overlap is at all serious it can be an extremely an

(Continued at font of next colunm.)

"Appetite good?

I should say so!

When it isn't Mother gives me

Baby's Own

Tablets

and they soon set me right. I like them, too,"

are

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YESTERDAY'S SOLUTION.

To

In many instances it will be found that a condenser has been tested on A.C. Where this is the 'case it should be remembered that' then the conditions of teat become different in that the maximum valuo of the alternating voltage is 1.1.4 times the rated value. Thus a condenser rated to have passed a 200-volt ¿A.C. test has actually withstood a maximum of voltage of 280. Of the two condensers, there- fore, the one tested at 500-volts D.C. and the other at. 500-volts A.C., the latter will have withstood the higher value, that is, actually 700

volts.

noying fault, and in a set depond- ing to any great extent on proper- ly applied reaction for its senei- tivity can make long-distance re- The ception almost impossible. trouble is that, if you adjust the set to its most sensitive state ‘aj little below the oscillation point, it is working in a thoroughly 'unstable condition. If a strong! atmospheric comes along the dat will probably break into oscilla- tion, and will not stop until you alack back the reaction consider- ably.

Each time you have to do this, of course, you "probably lose the the station altogether, because by the time the set stops oscillating the reaction has been reduced zo, much that it is a long way from its most sensitive adjustment. You then have to bring it up and more to the sensitive setting just short of oscillation; presently if goes over the edge once more, and you will see, the same thing as ploppy reaction, although, ità causes are: much the same. Probably it' should be regarded as a more acute. form of the same complaint, the

Some of the likely causas from which you can pick out the ones which you consider the more responsible are Wrong size of reaction coil, wrong high-tension voltage of the director or an un- suitable detector valve, the detec tor valve losing omission, wrong valve of grid leak resistance for the valve used, either the grid leak or high-tension battery become dud, coupling troubles in a mains unit H.E currents getting through into the LB stages, bad run-downlow-

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