1929-10-22 — Page 11

TUESDAY, OCTOBER 22, 1929.

Christmas 1929

Our exclusive selection of

artistic and choice

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DAILY CROSS-WORD PUZZLE.

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

112

24 15

19

20

116

20

JR 19 10

11

26

29

33

35

59

#45

50

收

43

447

48

50

52

54

55 56

57

150 69

BO

162

HORIZONTAL

1-To command Q-To ratify

12-Combining form-

"*"

13-An animal's don

14-An ore of zinc

17-Molstens

10-To drag

HORIZONTAL (Cont.)

18

VERTICAL (Cont) 47-Diminutive suffix \ 16-Opposita of Zenith 48-A patson in tobacco 17-Prefix. Through 50-Time period

18-Midday 51-CertiBod Public Ac 21-Twitching of facial

countant (abbr.)

muscles 152~The east wind 24-An American Indian 63-Ta run. (Scot.) 25-Pertaining to Aasop 154-To alleviate

28-A conspiracy 57-Solled

130-Celestial body (pl.) '34-Hemp in 30-To train 37-Gratifies

20-Language of ancient 60-German Indefinite

Roma

article

22-An old Franch coin 61-Girl's name

23-Man's name

24-To arbitrate

26-A high rocky

pinnacle (Eng.) 27-Having the quality

of causing stupor 29-One of an ancient Hebrow sect 31-Bah 32-Goca at * steady

paca

33-A baby'n chia-cloth

-35-A minētal spring

62-Rapture

03-Piped

VERTICAL 1-To ebb 2-A city in Alberta,

Canada

3-A Chinese shrub 4-Part of the body 5-A person's actual

drasa 7-Plantation owners 8-A card game

17-Messurée by etrides, 9-Tear

39-Anger

10-9on of Agamemnon

42-A city of Texas 11-Makes secure

+Calamity

38-A Roman emperor 40-Everlasting

41-Marked with a hot

Iron 43-Mountains of

Switzerland

146-A heatle

45–Alliag 48-One of the Great

Likes

49-A suggestion

:

85-Out (8. Afr. D.) 88-Curious scraps of

literature (58-A Mohammedań,

propar náme

10-A gentle breeze 5-Sick

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

YESTERDAY'S SOLUTION

ALLEVIATER

ASIA ** NAME

ANI

NOA R

INNS

DO NET CENT

ER

SÅGOT L

{SEN ASS TOT PETIT

YD CAD

SOAR SLEE

WERAGTURZO

WHAT READERS ASK

AEHÍAL SNAPPED IN A

··*: GALE·

THE CHINA MAIL,

RADIO TOPICS

MESSAGES OF BRAIN TO-DAY'S RADIO

LISTENING IN TO MUSCLES

Two dlatinguished Cambridge scientists recently produced the strangest gramophone record ever made. It was a record of a human muscle at work contracting and ex- panding in obedience to message flashed from the brain at a speed of fifty a second.

BROADCAST BY

!Z.B.W.

ON 950 METRES ·

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

5.00-7.00 pm-English Programme. (Columbia Records supplied through the courtesy of Measra. Anderson Music Co., Ltd).

The two scientists were Professor E, D. Adrian, of Trinity College, "On With The Show, 1929," Selection, Cambridge, and Professor Joseph

Debroy Somers Band.

Barcroft, Professor of Physiology ("Land Of Dreams," at Cambridge University. Professor "Gossamer Wings," Adrian was the "subject."

With a long needle piercing the muscle of his upper arm he knelt for nearly two hours in a studio, where the recording took place, experi- menting with himself and the amplifying apparatus until the best result for the recording was obtain- ed. From the needle ran a thin wire which connected to the amplify. ing apparatus-a weird collection of valves and wires.

J. H. Squire Celeste Oetet, "Martial Moments" March Medley,

The Band of H.M. Grenadier Guards,

"Madame Butterby-Give me your

Darling Hands," "Tales of Hoffmana-Barcarolle."

Dret: Isobel Baillie and Nellie Walkers,

"Silhouettes" (Arensky),

H. G. Aners and The East bourne Municipal Orchestra Time To Go" (A Shanty Ballad), "If Ever I Meet The Sergeant," Bass, Robert Easton,

"Norwegian Rhapsody" (Lalo),

Orchestre Symphonique (Paris). "The Fourth Form At St. Michaels,"

Comedy Sketch,

Will Hay and His Scholars. Elegie" (Massenet).

Shaded?" 'Cello Solo,

Finally the desired result was achieved. and through the loud speaker came a series of metallic raps. They were Professor Adrian's muscle movements in terms of sound, magnified 5,000 times. As Professor Adrian moved his armas Surrow Thy. Young Days there came from the loud-speaker a aeries of cracking raps like the

Clyde Twelvetrees, Morse code. As it was it sounded "Invitation To The Waltz" (Weber),

The Baste Symphony Orchestra, like the steady sip-zip of a machine gun firing rapidly. At times Aren't We All," Entertainer,

"That Little Back Garden Of Mine," the sound approached a crescenda It

Norman Long. Regimental Band of H.M. Grenadier Guards.

resembled miniature bombard-"Regimental March Medley,"

ment.

2

"As an aid in the diagnosis of certain nervous muscular disorders we hope it will be of great value. the Already it is being used in investigation of certain after-effects, of aleepy sickness which cause a muscular twitching." he said.

happening in the Future?" (J. A., Atherstone).

If the tree is a high one you could leave a certain amount of slackin the wire so as to compensate for sway in a high wind, but it is far better to provide a proper spring at each end of the horizontal por- tion. Ordinary 7, 22 copper wire is used as the serial. This is fastened to a branch of a tree and a halyard is taken down to an appropriate point on the trunk. The down lead is taken at a point about 10 feet from the side of the house, and it will be acen that when the tree awaya any tightness or slackness is automatically taken up by the springs. We have found the ar- rangement very efficacious as, al- though the house is on top of a hill and subject to high winds and gales, the aerial has not broken. - -

"I have a three valve receiver consisting of detector and two transformer coupled LF. I have made many experimenta but am still troubled with a great deal of distortion in the loud speaker, which is one of the new cone units with aluminium chassis. I afraid the transformers are rather old but I wondered if anything could be done to improve the quality." (A. B. B., Colchester).

SOME NEW IDEAS

PLEA FOR DEFINITE WAVE- LENGTH SYSTEM

There are a good many thou- sands of people scattered about the world who wish that the broadcasting authoritica would settle down to a definite wave- length system, and are almost in- clined to prefer the ills they wot; of to the trouble that is Involved by each new experimental altera- inte force. tlon-such as that which came

In the "old" day-of two or three years ago-wavelength jug-; gling did not matter so much, since there was a much smaller proportion of receiving sets in use which were really serviceable for distant listening, and these were in the hands of relative ex-: organisation of charts and perts who rather enjoyed the re

forth which was involved.

XO

I find, however (saye Robert W. Beare) that there is quite A general idea that altera- tion to the set is necessary for the best results; whereas it is only alteration to the positions of the various transmissions on the tun-. ing chart that is required. Prac- tically every good modern set has a more or less straight "curve"; that is to say, a given movement of the tuning condensers effects a change in the wavelength to which the set is tuned which is proportional throughout the range. An absolutely straight line would argue equally absolute mechanical perfection, which is unattainable: but should be so small as practically the divergence, generally,

negligible.

"Is Lipstick Nourishing?"

Monologue by Hilton Hayes.

Consequently it is possible for "Anglo-American March,"

all practical, purposes

to reduce "Scottish March,"

the degrees or divisions on the Regimental Band of H.M., condenser dials to terms of wave- Grenadier Guards. length to say, in fact, that an "Sing Hol For The Days of

alteration of one degree or divi Drinking."

sien is equivalent to a tuning al- teration of (possibly) three metres.

"On The Beach At Bancallo,"

Entertainer,

"Naval March." “Military March,”

Norman Long.

Regimental Band of HM. Grenadier Guards. 7.48 p.m.-Evening Weather Report. 9. p.m.-Evening General Programme, of Chinese Music,

10.30 p.m.-Close Down.

ALADDIN'S LAMP

FIRST SNAG OF THE

BEGINNER

[By Robert W. Benre) Isn't it rather wonderful that of all the thousands of people who handle radio valves with the contempt of familiarity, only a very small proportion really un- derstands what goes on Inside those little glass bulbs?

The same applies, of course, to every other part of a wireless aet, but the valve is so entirely a materialisation of the Aladdin's lamp of the fanciful tule that it seems a pity that more effort is' not made to understand its opera- tion.

If this is done It is simple to find any station on its new wave- length, even though it is so dis- tant as to be faint and sharply tuned. London, for instance, has dropped two metres. Its place on the dial will therefore be a little less than one division lower than before. Belfast, on the other hand, has dropped nearly 61 metres; but 61 divided by 8 oquals, roughly, 20, so that it will be found at about 20 divisions lower on the condenser scale. I have taken the figure of three be-j cause it happens to be correct for my own set, which has tuning. dials reading to 180 degrees. With dials calibrated in 1-100ths of its range the figure would naturally be different, but every listener can easily work out from his old chart the relation between tuning change and wavelength change.

Some Modification Alteration to the set itself to accommodate a new wavelength scheme is, as I said, not usually required, but there may be occa The first snag that the begin sions when some ZIU

modification is ner, with an average knowledge necessary. In the present case it of ordinary domestic electricity, is quite conceivable that some will strike, is that there is a com- Belfast plication of circuits inside the valve, two of which are not cir- cults at all, according to his ideas on the subject.

Hateners, whose sets would only just tune down to the old wavelength of 302.7 metres, will be quite unable to receive their local station figure is 242.

We note that you have tried most of the usual devices but there is still one line of experiment you may care to try and that ia shunting (a fixed condenser across the grid and plate of the power valve). This will cut down the strength slightly and will also make a noticeable difference in the quality of the loud speaker. If to the vacant terminal of the batcoll or colls. In general I should you have a .001 -variable condenser tery. When the switch is open, by you try the effect of connecting the circuit is incomplete, and no

now that the for instance, consists of a battery An electric light or bell circuit,

It depends upon the type of set or other source of power, with two terminals. A wire goes from quired, but in principle this con- as to the particular alteration re- one terminal to the lamp or bell, aiata then to a switch, and thence back turns of wire from

of the removal of a few the tuning

it in place of the fixed condenser current flows. When it is closed, across the two points mentioned. current passes from the one You will probably, find that altering terminal, through the circuit, the capacity of this condenser will operating the lamp or bell on its give an improvement in the repro way, and finishes at the battery duction. Orchestral selections will again. That is easy to under- generally be found to require a stand, and the filament circuit of different adjustment from, speach or the radio valve operates on these song, but it will be an easy matter lines. to find an appropriate eatting which will give you average results, and you could then remove the variable condensor and is its place substitute a fixed condenser of approximately the same capacity.

"A wireless friend tells me that

Simple Explanation

But the grid of the valve is a dead end: There is no normal cir- cult at all, and the same applies to the plate or anode. In the lat

advise the seeking of professional assistance, since the balance of a set employing the Reinartz or capacity type of reaction-as most modern sets dois very easily up- set.

plate to the positive, the complete circuit existe.

To explain the grid, it is neces- sary to realise that so long as the set is switched on, either with the aerial disconnected, or with the set untuned to a transmission, the flow of electroas, from fila-

ter case, one end of the bigh ten- ment to plate is steady and con-

ion battery--the negative ter- tinuous, and in this state it has

It is impossible to work two receiv-minalis connected to the la- no power to

to the plate.

cause sounds. In

Valve as Amplifler

ers off one aerial. The other night ment, while the other is joined, phonse or loud speaker. I made up a set and, as my wife through intervening components, wanted to hear the broadcast on our

It is only when the flow. is fa own receiver, I had to wait until There is a definite mechanical terrupted in any way that sounds this was over before I could test the break in the circuit, since the fila can be beard. And that la. what other sat Will, you kindly say if ment does not, and, of course, the grid is for to interrupt the there is any way in which two sets must not, make connection with steady flow. If you place a An- can be tested at the same time?" the plate inside the valve Yet ger on the grid terminal of the (E. AS Bradford).

current lows, as we know only too-valve holder you will hear a sound There are several methods of well from the unfortunate fre in the phones: If your tap it, rapid- "I have recently removed to a operating receivers from the same quency with which we have to rely a succession of taps will be new house, and as there is a large serial and the effect of this to a new dry batteries of recharge, heard. tree at the end of the gardent large extent, depends on the partiH.T accumulatore. conjected one end of my new aerial cular circuits involved. The Axed

...:

Whan signals are present in the Well, the explanation is simple. aerial, and this is properly con- to a branch and the other end goes condensers can be, of about 0008 There is a complete electribal vir nected to the grid the varying round the chimney. This worked capacity. Another method is to cult, because the heating of the electrical state of the grid causes very well until s vale sprang up in connect the aerial to one set; then filament causes a steady Dow from a sympathetic variation in the the night, and owing to the awaying connect the earth terminal to the the lament to the plate of alee flow of the electrons, and since of the tree the serial wire on two aerial of the other set and finally trons, or negative particles of very small changes in the grid occasions has broken, Can the earth is connected to the remain-electricity Since the stament is cause much greater changes in the make any suggestion to prevent this ing terminal Sheffield: Weekly equivalent to the negativo ter plate current, the valve obviously

Continued on Next Column.) Telegraph.

minal of the battery, and the acta as an amplifer

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