1927-10-04 — Page 10

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THE CHINA MAIL,

RADIO TOPICS

EMPIRE BROADCASTING.

Britain. Now, under the proposals which we are resisting, and which A 'Technical Problem,

are so vigorously advocated in in- Mr. P. P. Eckersley. Chief En-terested quarters, even the admit

$5 Startgineer, of the British Broadcasting $1.00

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Remarkable Reductions

in all Departments.

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Hong Kong's Artistic Photographers

PHOTO TAKEN DAY AND NIGHT

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THE NEWS -HERE'IN ITALY:

MAYDE INTERESTIN BUT I CAN'T. READ

· ITALIAN~

a

"FATHER OF WIRELESS.”

Paid $75 a Month. Edouard. Branly is cited by

tedly unsatisfactory and irregular Paris newspapers as typifying the

the

Corporation in a letter to the editor reception which may be possible struggle of French scientists to of "The Times" states:Discussion can benefit only those who techni-work under miserable conditions. of the subject of Empire Broad- cal knowledge and equipment are Branly is inventor to the condenser. casting is developing into a con- exceptional; in other words, a very France calls him the "father of the troversy which threatens to be less limited number of wireless cx-wireless," fruitful in positive results than in perimenters. I would add that it Branly has as his only assistant rather deplorable polemics. Cer is common knowledge that these in a ramshackle "laboratory," an tain proposals have been made to experimenters, while contributing aged woman who ekes out a living the B.B.C. for the ostensible pur- to the progress of wireless science, by doing extra hours of housework pose of expediting the inception of are not so much interested in the in other homes. This maid of all Batisfactory Empire broadcasting content of what they receive as in work, now After the most careful and friendly the fact that they receive. Hence, "Laboratory Chief."

scientist's consideration, we have concluded the mind of the amateur wireless telligent and the professor trained She was in- that these proposals are both pre-experimenter the fact of occasional, her in his work. mature and unsound. Their adop ever unsatisfactory, reception bulk For 50 years Branly has worked tion by us would have been much largely than the intelligibl-under these conditions, drawing a much easier and more popularity quality, or continuity of the re- salary of about $75 a month as pro- course than the one we have fol- ception. On the other hand, for fessor and supporting his family by lowed. So far as our action was the vast majority that is to say for occasional practice as a physician. concerned, there was no need for the listening public, the value of These facts are told, by French us to devise any elaborate defensive reception is determined by intelli- papers as illustrating the need to statement: But the continued gibility, continuity, and quality of pay well men who give their lives. strenuous advocacy of what we the service, Were it possible to to science. know are unsound proposals is so guarantee or to demand that the damaging to the cause of Empire listening public of Greater Britain broadcasting itself that I am now should suddenly join the ranks of impelled to seek the hospitality of the zealous wireless amateur ex- your columns in the hope that, after perimenters, even then the wisdom an accurate and authoritative ven- of premature action might well be tilation of the subject, you may be doubted. And for this reason. able to pass independent judgment That if the larger considerations of upon the issues at stakes.

Imperial unity and understanding between the parts of the British Commonwealth are to be served by wireless broadcasting, it will not be, through sporadic and largely unintelligible reception.

Arising out of our rejection of these proposals we are now criti. cised on three grounds-(1) in difference to Imperial considera- tions, (2) technical incapacity, and (3) a "dog-in-the-manger" attitude towards amateur co-operation. The beat answer to auch accusa- tions is contained in an accurate recital of the relevant facts.

ACCUMULATOR CAPACITY.

show that many matters of quite an We still receive Inquiries which elementary character are not pro- perly understood. These queries, for the most part, emanate from new readers and from those who have only recently embraced radio as hobby,

this is so in the big sense, it ap plies, I believe, with even greater force in the matter of the intelll-a given number of hours. An ac gent employment of the medium of cumulator may be marked "2-volt, wireless telephony. It is precisely means that it will deliver a 2-volt 60 ignition, 30 actual." This for the reason that we yield to no one in keenness on Empire conso-hour for 30 hours. The ignition current at the rate of one amp. per lation through wireless that I con- rating can be ignored, since it does tinue to resist proposals which not apply to wireless. am sure are inimical, not only to the best interests of wireless but also ultimtely to the well-being of the British Empire itself.

One matter that seems to perplex a great many is that of accumula- tor capacity. What is amperage? It has been aptly said that the What are ampere hours? What is British Commonwealth has been Ignition? What is actual rating? well served by practical idealists, These are but a few of the things and has been largely spared the ex-not generally known in purely ama pense of dangerous visionaries. If tour circles.

charge a current of one ampere for An accumulator is rated to dis-

cumulator. Let us suppose that we We thus get a 2-volt 30-amp. ac- use one valve which takes one-tenth of an amp. One ampere discharge I would emphasise in conclusion will feed this valve for ten hours. that this problem is entirely techni- As the accumulator is capable of cal; that the transmission side of delivering 30 amps, it will be large it has already been solved; that the enough to supply this one valve for reception side is still in solution; 800 hours were it possible or feast. and that by reception I mean scien-ble or advisable to run it right tifically organised relaying-posta and not direct reception by indivi- dual enthusiasts.

脊

STEADY. WITH THAT H.T.,

down.

No sagacious operator, however, runs his cell or cells longer than a decreet period. Before the

capa.

city of the accumulator is exhaust- ed, it should be put on charge again. longer and give better service. By adopting this plan it will last)

We began experiments leading to Empire broadcasting just over four years ago. On the transmission aida we have made considerable progress, and we have taken full advantage of the results of success ful experiments elsewhere. On the reception side progress has not been so rapid, and our research is still going on. The practical result of work done during these four years -and I include the experiments in Holland, the United States, and elsewhere is that at isolated' mo- ments it is possible in almost any part of the world to pick up some- what distorted music and speech transmitted by a short-wave station. On only some of these rather iso fated occasions reception is rea- sonably good, Nefther the time nor the duration of these admitted- ly unsatisfactory moments of recep tion can be anticipated. Therefore every factor essential to service is absent. No promise can be given of the successful reception of any Item at a given moment. This is a statement of fact, and because I, as an engineer, supported by the considered judgment of my en gineering colleagues have insisted upon the recognition of this fact, the B.B.C. is accused of a variety of crimes both against wireless and against the British Empire.

Having said this, let me add that, It is always well to have 100 volts these for five hours. If the

One amp. capacity will supply as a result of the work done and available, especially when choke or cumulator is 30 amps. actual, it the experience gained by four resistance coupling methods are will, officially, supply years of research, we are now de employed, but experimental tap- 150 hours. You listen in, on an them for finitely more hopeful of early satis-pings should be made from 45 up- average, 2 hours per day. In 75 factory results than we over were wards, a stop being indicated when days the capacity should be ex• before. By the end of this year we a higher tapping fails to increase hausted. Take it for the sake of shall be operating a short wave power or when an increased poten- discretion, that 60 days is long station experimentally. We shall tial makes the tone coarse..

enough. Then every six weeks you Now, when only half a battery is should take your accumulator to do this in netive co-operation with the Radio Corporation of America ed one portion is naturally de- the charging station whether it is and the engineers of the Marconi pensate for this unequal use, pro-

'pleted before the other. To com- run down or not, Company, whose experience in short ceed as follows. Assuming that 50 set a good bit, and are certain that If you happen to be using your wave work is far and away superior volts of a 100-volt battery are want you are exceeding the average, cur- to that of any group of engineers ed, place the negative plug in the tall the service time and get a re- in the world. Incidentally, the negative socket and the positive charge every month. experts of the Marconi' Company plug in the 50 tapping or as near to are in complete agreement with my it as possible. After a week's use, views on this subject. These place the negative plug in the tap- prospective experiments with our ping and the positive at the end of short wave transmitter should lead the battery, that is, in the 100 volt. up a stage further, "

tapping. After another week's use, revert to the zero and 60 volt sec tion of the battery, and then to the 50-10. portion.

It is noticeable that, as the mo- dern valve evolves itself, a lower and still lower plate potential that the accumulator is nearly run "But," you ask, "when do I know seems to be called for. As distinct down?" It is best to answer this from the old bright-emitter whose by a little dead reckoning. volume was proportionate to the anode current, the up-to-date dull- emitter requires very much less on the plate. Valve makers appear to be developing their products in this direction,

two-valve set equipped with valves, Let us assume that you have a which each takes 1 (or one-tenth) of an amp. The two will consume 2 (or one-fifth) of an amp,

ac-

COMMUNITY SINGING AT ALDERSHOT TATTOO.

first appearance at the Aldershot Community singing made its Tattoo this year, aided as usual by the Marconiphone Public Address By working to this plan, the half Amplifiers and Loudspeakers. sections will have a chance to re- A movable rostrum was erected cuperate, and a battery will last a in the centre of the ground and lo longer. If the voltage used in eight of the famous Round. loud above 60-say, 70 during the first speakers amplified the voice of Mr. week place negative plug in zero Ratcliffe, the well-known chorus and positive in 70. After this leader. period, place negative plug in 30 The mighty natural amphitheatre the battery willbe subject to con- voice of such a great and enthusias- and positive in 100. The middle of has never before resounded to the tinuous work, but the cells at the tie choir. end will be given a holiday every other week. In this way, also, a attery can be made to last longer:

Another way whereby to prolong

While we go forward with the technical aide of the work, the cog- nate problems of programmes and expediture are being considered. Ultimately we shall have to allow for occasions on which there most be transmission throughout the 24 hours of the day. There are also problems of copyright charges to be solved. Then there are arrange- ments to be concluded with the broadcasting authorities oversea, whose co-operation will be essen- tial. It should not be overlooked that effective Empire broadcasting will become possible only in terms of relays through, the broadcasting systems of the Dominions and the discharge of the cells is to con- BEST COUGH MEDICINE, MADE. Colonies. Perhaps I should add nect a 2-microfarad fixed condenser

There is no better medicine made for that I mean by the word "effective" across them. This enables one to Remedy. It acts on nature's plas, re-

colds. the kind of broadcasting which will use the battery till it is pretty old lieves the lange, opens the secretions, than Chamberlain's Congh enable the relays to be received because it will still give fair ser aids expectoration and restores the with reasonable clarity by the vice when, otherwise, crackling systems to a healthy condition. For sale average listener throughout Greater noises would occur.

IT'S BAD EMOUGH TO

(READ ENGLISH- VÅL CO, OUT" AN SEE IFA CANT GIT A PAPER

FROM HOMES

everywhere.

BRINGING UP: FATHER,

(D GIVE A LOT TO SEE A PAPER WITH THE BALL SCORE. BIN MEIN GATTİNİN

HOME SICK -

TUESDAY, OCTOBER 4, 1927.

DAILY CROSS-WORD PUZZLE

(This cross-word

word puzzle has been made by an expert but our readers are warned to look out for occasional phonetto spellings, such as harbor, plow, and altho.)

19

27

HORIZONTAL

1-in what city of

Italy was a famous council held in 18451 -Expire

6-An ace

©THE INTERNATIONAL. BYRON/

HOKIZUN TA pobortis 20-Raprasuce 29-Facility 30-Each labbr.) 31-Past participle

(abbr.) 32-Apostle (ahbr.) 34-Man's name, (abbr)] 36-To rattle 28-Mineral 30-Bind

BBhowing timidity 10-Arnolate of Arta

(abbr) 11-Name the Egyptian

sun-gad

12-A thoroughfare"

(abbr.)

13-A Grack letter 18-Part of circle (pl.) 17-What alate of

A

Brazil is the canter of the rubber Industry?

1P-Looked

Jore tidy

2. Jrown

28-The Greek goddess

Athena

40-A type of year

·wheal

VERTICAL

1-Row 2-To order, back -What English

admirat defeated the French at the Battle of the Nile?

Short blast from

horn

B-Doctor (abbr.)

7-Name unknown

(abbr)

VERTICAL ICan".?! 8-The balsam poplar

-Ob'ong with an

attenuated b108, as mans leavez 10-Ingenuity 14-Anger 18-0##

16-8ir (abbr.)

17-Name the Keystone

State (abbr)

18-Te spring forth 22-Bolid water 23-Musical note

24 Charted 26-Large tributary of

Mianouri River 26-The (French) 27-A tree S1-Prefix. Near 33-Two things of a

kind

36-A square land

measure (abbr.)

37-Topographics:

Engineer (abbr.)

SUGGESTIONS FOR SOLVING CROBE-WORD PUZZLES

Start out by filling in the words of which you feel reasonably are. These will give you a clue to other words crossing them, and they in turn to still others. A letter belongs in each white space, words starting at the numbered squares and running either ho`rontally or vertically or both. :

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

YESTERDAY'S SOLUTION.

FULTON AUSTIN U ARNO" ARDA E NOTI GAE C

SS MOCA HINER

RUPEE

SER PEAR BEE

SURGE BE

EXAUNT AYTON

HONGKONG HEIGHTS.

For the information of visitors the following list of some of the highest points on the Island and Mainland, is published:-

Island

ERST

IPOH

DOLE

Feet.

Victoria Peak ...

1823

Signal Station

-1774

Mt. Parker

1784

Mountain Lodge

1725

The Eyrie

1726

Peak. Hotel

1805

Taikoo Sanatorium

1000

Mt. Davis

877

Bowen Rd. (Alterbeds)

297

Mainland.

Taimushan

3124

Kowloon Peak

1971

Ν CED

SYSTEM

EVELAN

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