1928-05-29 — Page 10

10

New Summer Hats

FOR

LADIES & MISSES

New Models For

Sportswear and Dressy Occasions Prices Very Reasonable

ALSO

A New Shipment of

Flowers Just Received.

YEE SANG FAT CO.

ENGLISH WOMAN

Seeks daily employment as Nurse, Com-

panion or responsible position in Shop

or Hotel. Not on the Peak. Apply Box

No. 543, c/o "China Mail."

LEE FONG.

ARTISTIC PHOTOGRAPHERS.

Tel No. C. 4028.

No. 7, Wyndham Street. HONG KONG.

ASSORTED SCENERY OF HONG KONG & NATIVE LIFE.

SPECIAL

ATTENTION

GIVEN.

To Developing Amateurs' Negatives Printing, Enlarging & Framing.

BUSINESS DIRECTORY.

Bookbinders.

THE "CHINA MAIL" Book-

binders.

No. Ba, Wyndham Street,

Dentist.

BARRY FONG, Dentist,

1st floor, No. 14, Queen's Road Central. Tel. Cantral No. 1255.

-Electrical Supplies.

THE GLOBE FOOK CHEONG

ELECTRICAL SUPPLY CO., LTD, 72, Queen's Road, Central.

Tel. C. 8270.

Engineers &

Shipbuilders.

W. 8. BAILEY & CO., LTD.,

Engineers and Shipbuilders,

Kowloon Bay. New Work & Repairs.

Call Flag "L" Solo Areuta for Kelvin Motora. |

Hair Dressers &

Booksellers.

LEE YEE,

Ladies' and Gentlemen's

€ Hair Dressers

and Booksellers.

No. 12, D'Agullar Street,

(opposite Queen's Theatre)

Hair Dressing Saloon.

HANSON SKEY,

Ladies' and Gentlemen's

First Class

Hair Dressers.

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

Optician,

THE CHINA MAIL,

RADIO TOPICS

AN EASILY MADE CONVERTER.

"A" BATTERY.

NEW TYPE LECLANCHE

CELL

DIFFICULTY, SOLVED.

INCREASING RANGE. to some low reading on which there is no station; it will be noticed when the left dial is in tune by a rushing sound or a click. Now touch the aerial terminal with a moistened finger, and notice if there is a click when the finger In removed; if so, turn the control

Since the inception of broadcast condenser out until this stops, and radio, one of the greatest problems no double click can be obtained. that has confronted the country This procedure is most important, listener-in has been the difficuity otherwise the converter will only in obtaining a battery that would be working at low efficiency, and stand up to the task of working morcover, it will radiate. It should now be possible to tune in the set with a minimum of trouble distant stations by merely moving the tuning dials. When the build- The Introduction of low tem

[By "Sparka".]· Taking it generally, it can be said with a certain degree of ac- curacy, that 90 per cent. of the Interference experienced during broadcast hours is easily traced to regenerative receiver. The con- vertor which I am going to des- eribe in this article, not only pre- vents radiation, but increases the range and selectivity of the receive er to which it is connected. The circuit itself is not entirely a new

one and has been in use on sets in America for nearly a year.

Parts Required.

and expenso.

TUESDAY, MAY 29, 1928.

DAILY CROSS-WORD PUZZLE.

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

13

44

19

10

18

19

10

21

422

123

2.4

126

27

28

29

130 ३५

QS

136

46

22

45

46

447

49

er has become familiar with

theperature, or dull. emitter, valves has helped to a large extent to he operation of the converter should try varying the aerial selve the problem, inasmuch switch on

set, if one is fitted. they permitted the use of a dry Should it be found necessary to ad- cell battery. These latter, how- The parts required for the con- just the aerial switch, the complete ever, have not quite filled the bill, struction of this easily made de-adjustment of the control condens- as they possess several features

vice are as follows:-

One Ux. socket.

One 30 ohm. rheostat.

Two .0005 variable condensers. Five inches of ebonite tubing, Sin, in diameter,

Sixty feet of 24-gauge enamelled or cotton-covered wire.

One .001 fixed condenser, Panel 7 by 12. Terminals, bus bar, baseboard, screws, &e.

One Ux.199 tube.

One Bromer-Tally choke.

Begin by winding 56 turns of wire on the 3in. former, taking out a tap at the 28th turn; this com- prises the only tuning unit.

for carth

Layout.

aerial

are

er must be repeated, and once this that tend to make them undesir- ia done on no account must it be ablo. First of all, while being moved again. In fact, it is a good comparatively efficient, they plan to seal it in this position, as more or less expensive to replace it will stop any one else interfer- (and they need replacing fairly ing with the adjustment. This often), and they have a nasty habit convorter can be used with great of petering out unexpectedly, with success on such machines as the the result that until new ones are three-valve three-coil, circuit. obtained the set is out of commis- Browning-Drake, or any radio-fre- aton. quency set, In fact, it will add distance, selectivity, and volume to any valve set.

GENERAL HINTS.

IMPROVING RECEPTION OF FREQUENCY SET.

-----

Realising that the battery pro- blem was an important one, a well- known firm of English engineers, Messrs. Slemena Bros., tackled the problem.",and as a result of their efforts a new type of Leclanche cell has been developed, which owing to its low internal resist- ance is eminently suited for "A" battery work, providing dull emit-

valves

The are used. Leclanche cell, from a technical point of view, is one of the sim- last of the primary types and consists merely of a jur, a carbon electrode and a zinc rod, these latter unita being immersed in a solution of sal-ammoniac.

Mount the first variable condens- sex on the left of, the panel, and the rheostat near the

The present-day set, using a ter centre- bot- tom of the panel. The terminals stage or two of radio frequency, and batteries leaves little to be desired in the should be mounted on a place of way of eimplicity, selectivity and rear of the sensitivity, provided it is properly bakelite strip at the

and, perhaps, The coil should be built, balanced, baseboard. mounted on the left of the con- shiolded when used in close prox verter, immediately behind the con- imity to a powerful broadcasting denser, with the valve socket and station, such as is our local sta- choke on its right. The other vari-tion. To get the utmost sensitiv- able condenser requires to be ity and volume, it is sometimes de- takes place, which causes an elec- mounted at the extreme right of sirable to adjust the plate voltage tric current to flow, and in the pro- the panel, so that it will not inter- of both the radio frequency and CCSS portion of the zine electrode is eaten or used up. Replacements fere in any way with the training detector valves. In fact, many of condenser.

Wiring.

In operation, a chemical action

solution.

the present-day manufactured re are quite simple, and consist mere- celvers of the radio frequency type ly of cleaning out the cell and in- 鹗 fresh This is so simple as to hardly are employing a variable plate werting a now zinc and require. description. The aerial voltage for at least the radio fre- charge of sal-ammoniac terminal goes to the .0001 condens-quency valves. High frequency, Both these commodities are er, and thence to the centre tap valves are very susceptible sa re- common use, and are cheap. of the coil. The top of the coil gards the effects of carefully ad-

Quita as Effective.

in

HORIZONTAL 1-Lobator-lika orustacean -Influenc 11-Indigo 12-Realined

13-To cause lingering

diatrese 18-8mali

17-Finale

18-Toll

20-T hasten 21-Aloft 23-Egyptian king

24-Stop 25-Devil

57-Parchando 28-Follower

29-Bulging

32-0f or from Waits 86-Vex 87-Po#ALOM

39-Auction

40-Poem

32.

133

34 135

©THE INTERNATIONAL SYNDICATE

HORIZONTAL (Cont)

41-Specialty

VERTICAL (Cont) 114-Poker term [18-Pause in.

44-implement of

43-Boy's nickname

combat

40-Regard

48-Roman emperor |40-Te foreteli danger 150-Holy day in Spring

5t-Appropriate

VERTICAL 1-Broaden out. 2-Chanoo

3-Writing fuld

4-Machine Yor grinding -Fold 6-Apportion 7-Blonde

B-8pazm

S-Enonate

10- A Bore

?

conversation

19-Thlet

22-A puddia

(Prov, Eng.)

24-Rabbits 25-No

27-Cut with an axe 20-To grase |30-Amlatant

31-Gathers up 33-Hidden

34-The blackthorn 35-Having the edges

turned and stitched 37-Virtu

30-Cooks slowly

41-Warning cry in golf

42-Jacob's brother

46-Fondle

47-Prefix meaning

*ithrea**

SUGGESTIONS FOR SOLVING CROSS-WORD PUZZLES Start out by filling in the words of which you feel reasonably sure. These will give you a clue to other words crossing them, and they in turn to still others. A letter belongs in cach white space, words starting at the numbered squares and running eltker horizontally or vertically or both

+

(Tree solution of the above cross-word puzzle will appear in iu-morrow's issue along with a now.erosa-word puzzle.)

runs to the stator plates of the justed plate voltage. Instead of Previous to the type perfected tuning condenser, and then to the employing 67% or 90 volts, as is by Siemens, the Leclanche battery grid of the valve, while the bottom the standard practice, it will be was. considered unsuitable for "A" used, three or four cells are neces- of the coil goes to the ground ter- found advisable at times to in battery work, because it ran down, sary (each cell gives 1.5 volts), 80 minal, to roter plates of the varicrease the voltage to well over 100, or polarised, very quickly, and soon that the yearly cost of upkeep able condenser, and to negative particularly when striving to get became useless. The makers of would not be more than about 18/

The rheostat is placed in signals that are weak. On the the new cell have overcome these for a five-valve set, in the positive lead. Leads from other hand, for powerful signals it difficulties by using larger elec- As previously pointed out, the the rheostat and from the negative is usually advantageous to reduce trodes of a new design, and have celia

are only adaptable filament go to the two A battery the radio plate voltage to some produced a cell of a capacity of for use with dull emitter valves, terminals. From the plate ter-where about 45. A mest satisfac-

filament.

minal of the valve socket a wire tory arrangement in this connec- one hundred and eighty ampere These, of course, are quite as effec- high temperature runs to one side of the control con- tion, irrespective of the type of hours, and capable of being dis- tive as, in some cases more effec- denser, and then to choke, going to high frequency receiver, is to tap charged at a rate of half an am- tive than the B battery terminal. The remain- the "B" battery output for the pere. This, to the average user of type, and with the range of valves are offering now it is possible to ing terminal on control condenser radio frequency valves with an effl- & five-valve set, would mean an up- gets to the output terminal, and clent variable realstance. Quite a proximale life of six to eight operate a five-valve set on a cur- rent consumption as low as 3 of completes the wiring.

number of these are on the market, months without recharging.

ideal combination an amp. An would be to use valves of the four) volt.06 type in the radio frequency and the detector, and valves of the

Operation.

Re- and usually have a value of 100,000 charging costs about 2/6 per cell. First inspect the regenerative ohms, This should be connected Depending on the type of valves set; and see if the earth is con-between the battery terminal and nected to the filantent. If not, con- the radio frequency "B" positive nect it to the negative filament, terminal of the set. This method

minal to the 67-volt tapping on the|ception from the set. set battery. Disconnect the aerial

Corrosion.

I type in the amplifiers, In these

YESTERDAY'S SOLUTION.

阿甘

IGA

RTURO ABLEL CRICKRAMP GGKTAPIR RECOTE TONES EATS

AERS

NAT

1. GELID

ORACLE

NOTES LİGE SUCS

ESSE

RADIO RESEARCH.

of the set would be only .38 of an! Professor J. P. Madsen (of Syd-

amp., and

the cells would last ney) consulted the Radio Research

re-

and after the converter has been in provides a definite meina of com- ble and brought the set back to its conditions the total consumption; operation, see If connecting it to pensating between the overload normal state. the positive filament makes any signals from local broadcasters and A Magnetic Screwdriver.

Board, and obtained information difference. Connect A battery ter- the more or less weak signals from Very often when one is building about eight months without

as to the best methods of internal minals on converter to A battery distant stations, and will, if used a set one gets up against the trou- charging,

Six-volt valves of the same type and external wireless communica- terminals on set, or direct to bat-carefully, add a great deal both to ble of placing screws in rather an tory. Connect the B battery ter-¡the sensitivity and clarity of the re- Inaccessible position, Usually may be used with perhaps slightly tions applicable to Australia, es- ifpecially in order that listeners in when this occurs it is almost im- better results, but of course possible to hold the acrew by the these are employed, another cell the back blocks can get the best results from broadcasting. He in- and earth from the aet, and con- Nothing is more effective in ra- fingera until it is started, and un- would be needed in the battery.

quired into the regional scheme of nect the output terminal to aerial ducing the sensitivity of a receiv- less some means of getting it into The cells themselves are quite the British Broadcasting Corpora- terminal, and leave earth terminal or than a layer of corrosion on the place to devised quite a lot of time sturdily built, and are selling at tion decreasing the numbers of sta on the set without any connection. terminals or contacte. In the wir and patience are absorbed. A radio stores for about eleven tions and Increasing the power, Connect aerial and earth to the ing. Quite recently the writer stunt that is quite within the range shilings each. The assembly and and also requested the Admiralty to terminals on the converter, insert while inspecting a set for loss of of any radio enthusiast is to make care of the whole outfit is well extend wireless activities to Aus- THE HONG KONG OPTICAL CO. the valve, and slowly turn up the power had an experience with cor- the screwdriver magnotic. Proceed within the scope of the average tralia.

rheostat until the valve lights. rosion, that may very easily be en- as follows: Wind a layer or two of child, and consists merely of plac 53, Queen's Road Central,

Burn the valve as low as possible. countered by the average listener. 24-gauge D.C.C. or any covered ing the carbon and zinc in the jar the national physical laboratory Adjustment of Control Condenser. In this case the trouble was in the wire around the driver and connect and adding the aal-ammoniac solu- authorities in connection with the

If there is an aerial switch on radio frequency coils. In this par. the ends to a battery. This will the set, turn it all in, turn on set, ticular make of coil bullow rivets make a more or less powerful election Beyond an occasional top- proposal to establish British phy- ping with water no attention 16 sical standards to Australia, ‚·`re- and set It oscillating. Now place were used to hold the soldering tro-magast of the driver, and after the control condenser all in, and lugs, and these had become corrod the wires are taken away there will needed until the cells are dis placing the present standards in by, turning the tuning condensor on ed underneath. Such corrosion, to still be enough residual magnetism charged. Tests of the cella, both the different States. converter, and condenser on Bet, a casual glance, is almost invisible, in it to hold screws long enough to in Australia and overseas, have tune in a station, such as 2BL or yet in this case it was sufficient to enable them to be placed in poal proved them to be wonderfully

An automatic telephone service The same suited for their work, and there is 3LO. If this comes through cor- mako all the difference to the sen- tion and screwed up.

no doubt that they will help very for

district the Medway Scraping the driver, will also be useful for re- rectly, turn down oscillation con- sitivity of the set. trol on sot, and note if music is rivets and soldering them so that, trioving metal parts that have materially towards solving the officially opened at Chatham Post

by Lieut.-Col: Moore clear. Now make the set oscillate, the lug wire and rivet. became a dropped Into inaccessible parts of battery problems of the man out of Office

Brabazon, M.P. for Chatham. and carefully set both tuning dials solid connection rectified the trou- the set.

'Phone 2292.

Printers.

"THE CHINA MAIL," General

Printers. Publishers and Bookbindera.

3a, Wyndham Street. Tel. C. 22.

Ship Chandlers.

E. HING & CO.,

25, Wing Wo St. Tol. C. 1116, Metal Merchants and Shir

Chandlers. Managing Director-

town.

Professor Madsen discussed with

was

FOR SALE.

ASIATIC AND FOREIGN POSTAGE STAMPS In Bags, Packets, Sets, and

Single.. PICTORIAL POSTCARDS. With Chinese Costumes, Views of Hong Kong, Canton, Macao &c.,

and

ALBUMS of HONG KONG

SCENES.

GRACA & CO. Dealers in Philatelic Goods,

Artistic Postcards, Toys, ":

Picture Books, &c.

No. 10, WYNDHAM STREET, P. O. Box No. 610, HONG KONG

SAY-I'M WAITIN'

AND GIVE IT TO MR TON ALL YOUR

TAKE THIS DIE OVER

́DE PLORE - HE'S IN'

| THE OBSERVATORY-

[GUESTS-WHEN |001.GIT SOME

FOOD?

BRINGING UP FATHER.

BY GOLLY-1 WISH MACCIE WOULD POST: PONE THESE:: AFTERNOONĄ

STEAS UN TIL

AFTER

DIE

HAVE SOME PIE, MR OS

PLORE?

1921, by

OH! I'VE EATEN SO

MUCH- IS IT COMPULSORY?

NO APPLE.

I JUST BIT. ONE END OF IT-