1929-11-05 — Page 11

TUESDAY, NOVEMBER 5, 1929.

For your four-furniture-and every domestic article requiring a stained and varnished finish.

"Wilheycla"

Oil Varnish Stains

IN

Oaks-Walnut Mahogany-Satinwood Rosewood-Ebony Black

Can be applied by anyone. Always reliable, never sticky. Non-polsprou and Durable.

AGENTS:

S. C. LAY & CO.

Alexandra Building.

Telephone Central 763.

Wilkinson, Heywood & Clark

SHANGHAI.

Christmas 1929

Our exclusive selection of artistic and choice

Private

HONG KONG.

Christmas Cards will convey just that little message of Good-will to your friends in other parts of the world.

A

THE NEWSPAPER ENTERPRISE, LTD. "China Mall" Bldg.

3A, Wyndham Street

DAILY CROSS-WORD PUZZLE.

(This cross-word puzzle has been made by an expert but nur readers are warned to look out for occasional phonetio · apallings, such as harbor, plow, and altho.)

12

13

15

17

18

9

12

113 14 15

16

18

19

20

21

23

24

25

17

28 29

30

23 134 135

36

137

29

D2

03 144

45 46 47

48

99

50

150

52

54

155

160

161

[62

Ko?

65

66

60

169

70

56 57 58

H

167

HORIZONTAL 1-A noted city,

B. Manchuria

6-To shelter 11-An air 12-The Greek long O 16-A light breeze 17-Oxidation of fron 18-ülel's name 19-A Peralan soln 20-The final result

23-Flowed

_29-Cryptogamous-

plants 24-Acorns and the 20-Valld 28-Esch (abbr) 80-A Chiness shrub

· 31-Part of the head.

22-Millimeter (abbr.):

{ HORIZONTAL (Cont);

VERTICAL (Cont). 61-A musical note 15-A river of ladin 63-Old spelling of hart 21-Consumer 54-A river of Africa

50-Woods

69-Conclusion

81-The ridge of a wave 64~A Habrew month 55-Ride (Scot.) 66-A queen, of England 57-A city of Texas 68-River in $. &

France 70-A baro rock

standing stone

key-Correcta ·

38-A bit of food... 86-Vast travleke plaint Main, Miberia

#9-To be indebted 40-A scult?NAM 41-Fabled watsenymph 48-Ably send for

*Conkubationen "48-16, partie

72-8lumbers

VERTICAL

23-Forward

25-To understand

29-A fovo-affair 27-A nereal

32-Pools

To Possess 36-A color 87-Cooking utensil 88-Close friend 42-Chill 43-And not 44-Penetraten

146-To stray.

46-A Mohammeden

proper name.

1-A soldier. of the era 47-Bompstone £-Extinct wild ox of 48-Capital of Canada

Europe

32-Burtes S-Touch with the lipe 53-A shore bird 4-A known feet 65-To obliterate

58«A nation..

B-A negativa 9955--The first' mas

An; Interisation T-Hansacked;

60-No (Boot.)

A rough sound of e. 162-A sumir denoting. Me Algeria

10 To redeem

- sharp quick sound

53 Exist

30-8. State of U. 6.4: 12-Subject to death. 60-A prata farm ot

(The solution of the above cross-word puzzle will appene in to-Morvideá karsia along softh a new crossword puzzle, él

THE

CHINA MAIL,

RADIO TOPICS

TO-DAY'S RADIO

Broadcast By Z.B.W:

ON 350 METRES

The following programme will be broadcast to-day from the Hong Kong Broadcasting Station Z.B.W. on 350 metres,

5.00-7. English Programme of "Columbia" records. Supplied by the courtesy of the Anderson. Music

Co.

(Subject to alteration). "This Year of Grace" Selection,

London Pavilion Orchestra. "Liebesleid," "Zapafundo," Violin Solo,

"Devil-May-Not-Care," "Family Secrets.”

Efrem Zimbalist,

Billy Bennett.

"Aida," Selection,

New Queen's Hall Light Orchestra, "They Call Me Mimi," "One Fine Day." Soprano,

"Voca! Gems,"

Doria Vune,

The usual practice of connecting the high tension after the valves of the receiver have been switched on should be follwed, and, moreover, the practice of switching off the unit before the valves. The valves will then discharge the con- densers in the unit.

microfarad is satisfactory.. There passing much more than 20 mil- is a little advantage in using 4 liamperes. microfarads, however, as the output voltage is a little greater than when a 2-microfarads condenser is used.

Having obtained a supply of direct current at about 120 volts, the_next_point to consider is the arrangement of the receiver to which the unit is to be connected. The H.T. unit was designed for the "Dual-wave 8." In this receiver there are three separate high-tension cir- cuits. The maximum output from the unit may be taken to the power valve, which to therefore connected to the positive side of the condenser.

B:tector Voltage

For the detector valve, a voltage of rather less than the maximum provided by the unit is needed. One of 90 volts is suitable. and it is therefore necessary to include a resistance in the anode circuit. must have such a value that 30 volts It are lost in it. The value of resist- ance cannot be estimated, however, until the current passing is deter-

Ross and Schubert, art. Clutsam. mined. "To Wander,"

"The Organ Man,"

"I am not angry,”

"Song of the Blacksmith,"

"Laughing and Weeping,"

"Tartarus,"

"The Two Grenadiers,"

"The Er! King,"

"Henry the Fowler,"

Sir George Henschel, Baritone. "Trio in "C" "A Bright Morning en the Alps,"

L. Van Beethoven, Holst. "Ship O' Mine," "Glorious Devon,"

Sears and Youmans.

Friedlander and Conrad, "Honey, I'm in Love with you,” "I Am Thinking of you,"

Friedlander and Conrad, Irving Caesar & Louis Hirsch.

"The Miser, "The thinking of you,"

Billy Bennett,

"Tale of Oahu,"

"Waters of Waikiki,"

Farera.

7.48 p.m.-Weather Report. 9.00 p.m.-Chinese Programme. 10.30 pmClose Down.

THE H.T. UNIT

An Eliminator for Alternating Current

to

Assuming this a amount to 1.5 milliamperes; then the re- sistance must have a value of 20,000 ohms. If the current had been 2 milliamperes, the resistance would have to be less 15,000 ohms. A current of 1.5 milliamperes is an average value, however, and the resistance

may, therefore, be

If the unit should be connected to the mains without a load in the form of a resistance the condensers will charge up to a receiver,

voltage considerably greater than 120, with the result that if the parts are touched, a sharp shock may be experienced as

the con- densers discharge.

Safe and Silent and silent In operation.

This little unit is perfectly safe able for three-valve receivers and It is suit. few having your valves, but it is bend detection or a shielded valve. not arranged for sets having anode. The anode circuit of an anode. circult detector should be supplied from

อ potentiometer and 80 should the shield of a shielded valve.

ELECTRIC RECEIVER PRICES

Astonishing differences in the shown at the Olympia Show. A twe prices of complete receivers were valve set consisting of detector and pentode, with rectifying valve and the necessary smoothing equipment. The H.F. valve must be supplied cost £10 108., yet a similar set was all complete to plug-in the maina,

fixed at 20,000 ohms.

108. A

Usa

or

the

The addition of a screened grid A.C. high-frequency stage will in- crease the selectivity, but will in addition greatly increase the price, and a three valve set of this charac- ter was shown by the R.I. people priced at £30. Another receiver to this specification was exhibited by an American firm, with a factory in England, and priced at £17 108. Provision was made in both these sets for connecting a gramophone pick-up. an important detail.

with approximately 60

volte

shown by another manufacturer on and 25 the total voltage a stand not far away, and priced Haydn Wood.| is 120, the resistance includ- £16 Thorpe Bates, Baritone.ed Jr.

similar its high-tension supply set

type of "Tie a String around your Finger," circuit mast reduce the voltage by for

for over 20 year "Mercenary Mary,"

domestic 60, A normal anode

purposes, current for 2 LO and 6 GB at great volume, gives this valve is 1 milliampere, there with four fore

Ave the resistance

continental must about 50,000 ohms. One of 50,000 ness has fallen. The transmissions be stations mast evenings after dark- ohms could be used, as the anode from the new regional station at current passed by different valves, Brookman's Park give a "wipe out" of the same type varies by a few effect, practically covering per cent.

whole of the tuning dial (five As the voltage-reducing resist-miles away) so that alternative ances are employed mainly for the programmes in the future will be! purpose of regulating the voltages, rather problematical. they must be connected to con- densers in order that they shall not affect the working of the receiver. Smoothing Arrangements The combination of a resistance and condenser forms д most effective Alter in two res pects. In the first place, the output from the main Alter is still further smoothed and. aecondly, varying currents which may pass The introduction of a new-model through the anode circuit of the metal rectifier by the Westinghouse valve will tend to flow through the Co.. priced at such a low figure as condenser and not through the

A four valve set, with two stages 21s. means that anyone can now resistance to the main buiki a high-tension mains unit for condenser.

of A.C. screened grid, detector, and filter The

resist- output

pentode designed in Holland, and for about £5. This rectifying unit, ances and condensers therefore tend

Now manufactured in Bri- which is known as Type H.T.3, is to prevent anode circuit couplings

tain, is priced at £37 108. the half-wave pattern and will and motorboating or other forms of It gave an astonishing per. give an output of approximately 120 instability.

formance. The tuning circuits volts at 20 milliamperes-quite The effectiveness of the output are ganged, and simply turning a enough for ordinary receivers, such as those having three valves. It ing larger condensars or resistances, strength coupled with very good Alters may be increased by employ-mall knob at the side brings in station after station, at great comprises, as a matter of fact, one but, as the values of the resistances quality. This is made possible by "limb" of a Type H.T.1 unit which have to be decided according to the a special penfode valve taking 300 will give an output of about 200 voltages desired, one may only vary volta H.T. instead of the usual 160. volts at 100 milliamperes. Type the capacity of the condensers. It Finally, a six valve aet with three H.T.1 is a full-wave rectifier and is is sometimes necessary to use 4 stages of HF., designed rather large for those using an ermicrofarads each for the output three years ago, is still being dinary receiver.

condensers, but 2 microfarads each sold under its original title, and The Typo H.T.3 unit must be sup la sufficient. The unit is easily with single knob tuning and push- plied with voltage of 135 measurconstructed as there are only a few puli L.F. costs £51 5s. ed when the full load is being taken parts. The following parts are from it, or 140 volts at no load. A recommended transformer must therefore be used

to adapt the mains voltage to one suited to the rectifier.

One baseboard, 12 in. by 10 in. One H.T. 3 metal rectifier (Westinghouse).

THE OLYMPIA SHOW

over

By the time these lines appear One power transformer (Varley, be opened and enthusiasts from all (says a Home paper) the Show will Regentona).

over the country will see for them- One power choke (Regentone,selves the progress that has been

made in the past year.

This transformer will have a pri- mary winding wound to suit the voltage and frequency of the al- ternating-current supply, but Varley). manufacturers may issue trans

Sir 2-microfared mains conden formers having a tapped primarysers (Ferrant, Dubilier, T.C.C.). winding for various voltages. Care muat then be taken that the flexible wires used for connecting the mains are joined to the correct terminals.

The transformer and rectifier to gether for a unit for converting the alternating current into a pul

wire-wound resistances (Ferranti, One 50,000 and ane 20,000-ohms Varley). ..

Four terminals, marked H.T.-, H.T. + 1, H.T. † 2, and H.T. † 3.

Terminal atrip, 2 in. by 5 in. Screws, and length of rubber-

eating direct current. Actually covered wire for making connec there are 50 pulses of current per tions.

Indications point to a great increase in mains equipment," and j compact receivers as well as port practically all firms will show

able mats that only require to be plugged in an electric light socket for complete operation.

Combined radle and gramophone and there is no doubt that a short sets will also be greatly in evidence, period of time will see the marriage of the two branches of home enter

second when the frequency of the A baseboard of convenient size A.C. supply is 50 periods per second. may be used and the parts screwed The output from the rectifer is, to it, or some may have a small box tainment. The receiver of the therefore, varying all the time and or other container into which the turntable driven by A.C. motor. future will contain a gramophone is quite unsuitable for the anode parts may be fitted. The wiring, and if the broadcast programme current supply to receiver.

too, is easily completed, using systols not liked, a turn of the switch Only smooth or an unvarying flex and tinned copper wire, will give our own selection of re- direct current is suitable, becaueo Glazite. ⠀ variations produce, noise or hum. It Care must be taken when cords through the loud speaker. is, however, an easy matter to connecting the amooth the output by using conden- from the mains, as in the sers and a chocking coll. These Varley transformer the prim actually comprise a 4-microfarad ary winding is tapped for condenser. 3

flexible

wires

THE "W.T." PORTABLE

We found it necessary to use various voltages. A duse in the about 80 feet of wire as an serial. A good choking coll must be used. form of a suitable flash-lamp bulb, This was hitched to the top of the It need not have a very low resist may be fitted in the primary circuit car, and the negative terminal" of ance, but it must have a large in thought necessary and the ap- the accumulator was connected, to doctance when passing the normal paratus should be covered in order a wire fence, making an effective local current which should not exceed to avoid an accidental contact with counterpoise earth. With these milliamperes. If the inductance of the metal parts or terminals carry alds reception was extremely good. the iron-cored choke is too small, Ing high tension. Ma

On the return journey the set the output will not be properly, It is true that the output voltage was switched on in the car, but a smoothed, with the result rum is low, but the Input voltage, which good deal of interference was will be emitted by the loud-speaker, may be up to 250 volts, is anticlert caused by the dynamo. When A good value, would be 50 henries at ly high to give a shock.

nearing London, the signal strength

The cover

20 milliamperes, although it can be may be of wood or metal and, If it greatly improved and the vaudeville much more, or even a little legs and is rather atgal, so that the parts concert was heard in comfort, with atll be satiafactory component have to

for this unit

Condensens of 4 microfarads are provided.

not abadlutely essential, but unless rectifier the the choking call is a very good one ignoring, the the pair of 4/microfarads should be terminale employed. With the choking calls unit by

close together, a slight backgrund of dicks from

be the fetramentozak egy

Altogether a great day. No ne

-to report, and we arrived

the

nder: the

tle tired perhaps, mories of an unforgettable

Experience.

but

THE

HONGKONG ! PENINSULA HOTEL:

11

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AND

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will be very glad to receive them at the

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AT PRESENT, OUTDOOR WORK ONLY

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PHOTOGRAPHER.

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