1928-12-04 — Page 5

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MODERN WIRELESS.

THE MARVELS OF TELEVISION AND WIRELESS.

INTERESTING LECTURE AT HELENA MAY INSTITUTE,

WHAT HAS BEEN ACCOMPLISHED,

Major W. G. H. Miles, R.M., of Stonecutters' W/T, Station, gave a most interesting lecture yesterday afternoon at the Helena May Institute on "Modern Wireless."

"It will be remembered that Major Afiles spoke last year-on-the- same subject and his lecture yesterday was a continuation and development of the earlier one, since much has been discovered. in the last twelve months.

His Excellency the Officer Administering the Government (the Hon. Mr.. W. T. Scuthorn, Q.M.G.) was in the chair and intro- ducing Major Miles, he said that wireless was interesting, people all over the world and it was a great privilege to be able to listen to an expert on his own aubject. To the ordinary layman · wireless was a complete mystery and he was reminded of the story of the child at the Zoo who when he saw a giraffe remarked : "I don't believe it is true." Many of us felt like that about wirelers but it was true and Major Miles was going to explain some of its mystery.

' ';

means of com-

First Principles Of Wireless. radiation of energy in the form of The lecturer began by explaining

Aether Ware. The wireless the first principles of wireless. It waves having left the aerial spread was, he said,

out over the surface of the earth munication between one human in the form of circles and travelled brain and another. In any form of at the same speed as all other communication there were three waves, namely 188,000 miles per essentinta a transmitter, a receiver, second. and an intervening medium, as the mouth, ears, and the intervening medium, the air of the room. The sound of the voice was con- veyed to the ears by means of sound waves.

Heaviside Layer,

One might well ask why they stuck to the surface of the earth at all, and did not shoot off into space, The reason alleged why the waves do not shoot off the earth was that the upper layers of the atmosphere

THE HONG KONG DAILY PRESS, TUESDAY, DECEMBER 4th, 1928.

Television.

In Telephony," sound was turned into a current variation, sent out

WEDDING.

MISS SUZANNE WEILL AND MR. ALEC HUTTON POTTS.

RECEPTION AT PORFULAM.

A wedding of considerable local, interest took place yesterday. at the Registry Office, between Miss Suzanne Weill, daughter of the late Mr. Albert Weill and Mrs. Well, of Alberrose, Pokfulam, and Mг, Alec Hutton Fotts, son of the late Mr. A: C. Hutton Potts and Mrs. Hutton Potta

sa a modulation of a carrier wave, sad turned back into sound. In Television, light was turned into current "variation, sent out as a modulation of a carrier wave and turned back into light. In tele rision the picture to be transmitted was traversed, or explored" very rapidly by a spot of light: the re fected ray varied in intensity according to the degree of shading of the point illuminated: this ray shore on a cell which had the pro perty that its resistance varied ac cording to the light falling on it:

The bridegroom is a well-known a current, passing through the call, local broker and a member of the was thus varied in intensity in a Fanling Hunt, of which he was in similar manner to the spot of light. charge when the joint masters, Dr. The variations of current were in F. Fierce-Grove and Mr. H. Birkett pressed on the wireless carrier wave, were both away on Home leave. and modulated ik The wireless He is also keenly interested in flat ware, thus modulated by the pie-racing, in the roles of owner as well turo, was 'received on a suitable ciras gentleman rider. cuit and the process reversed, An-*| Mr. T C T. Beck was "' best other ray of light being made to man and the wedding was also vary in internity and trace oct on witnessed by Mrs. Darby. a white screen the, original picture.

J

Short WarES,

A dramatic change had come over wireless in the last 3 or 4 years, in the introduction of Short Ways working.

Amateurs, with their waves below 200 metres, started trying to signal across the Atlantic, and to the sur- prise of themselves and everyone else, succeeded, in December 1991.

Encouraged by this, they carried on trying, using shorter and shorter

of the earth are rendered opaque waves. In October 1924 two-way to them by the action of the sun's communication by night was effect- The earth was thus sur-ed between England and New rounded by a shell which kept the Zealand on 30 metres; and in May waves inside it. This apper opaque layer was generally termed the 1925 two-way daylight communica. "Heaviside layer, in honour of tion between England and the the physicist who first postulated it. Reception,

If you struck the "middle C" on a piano you set in vibration string tuned to oscillate at the rate of about 250 vibrations per second, by means of two properties-weight | raya. and springiness. The vibration of the string produced a vibration of the molecules of the air termed a "Sound Ware." having quency of 250 vibrations per second. This sound wave spreads: outwards at a rate, that in the same for all wares in air, of approxi-struck a conductor such as ea "mately 1,100 feet per second, the aerial wire, it tried to start a car greater the frequency the less the rent flowing in it. wavelength, and rice verse.

Fre

+

Whenever the wireless

WAVE

States on 28 metres.

Such fents are now commonplace, and amateurs are able to com

municate with others in any part of the world by morse or telephony, provided they use the right wave and time of day, using power taken

Mr. and Mrs. Grossman," cockail jug.

Mr. and Mrs. Marcel, linen lun. cheon set.

Mr. H. Seth, cake basket and jam jar.

Mr. and Mrs. & M. Raymond, chaque,

Mr. and Mrs. B. L and Mr David Ellis, Pickle stand.

Aunt Elize, silver tea set and tray.

Mr. J. E; Joseph, cheque.

Mr. and Mrs: Ho Leang, cloisone bowl. spoons

Mr. and Mrs. Ho Wing, coffee

Mr. W..T. Stanton, pair cut glass Mr Horace Lo, pair silver and decanters. enamel frames.

Mr. T. P. Tong, silver cigarette case.

Mr. J. K. Shaw, menu holders. dish.

Mr. M. M. Watson, hors d'oeurrOS

Mr. A. H. White, pair sauce boats.

Mr. H. R. Forsyth, coffee spoous. Mons, and Mde. Montargis, fancy table lamp.

Stuart Smith, pair pictures.

Mrs. Staart Smith and Mr. E.

case.

Mr. C. B. Brooks, ink stand, Fanling Hant, silver salver. Mr. Hodgson, sugar sifter. Dr. C. H. Burton, leather suit- A reception was held at 5 'p.m. Mr. and Mrs. Chan Tin Sion, pair at Alberrose, Pokfulam, the resid-silver vases, ence of the bride's mother... The

Mr. T. N. Chau, pair silver ash traya. bride, looked very charming in a dress of white taffetas and silver lace with a veil of Brussels lace, and she was attended by Miss Yvonne Perry as flower girl, and Master Albert Odell as page, both dressed in Victorian costume.

The bride's mother wore a dress of green georgette and Mrs. Harry O. Odell, sister of the bride, wore beige georgette.

young

After the reception tho couple left for the President Lincoln by which they are travelling to Shanghai for their honeymoon, Mrs. Hutton Potts being dressed in a Paris model in black and red geor- gette with à black hat.

A large number of guests were present at the reception and many lovely gifts were received by the bride and bridegroom.

WEDDING PRESENTS.

Bride's mother and brothers, din-

A Wireless Receiving Circuit. like the Transmitting Cirenit, com prized a combination of inductances and condensers whose valuce could from the house lighting system, and te diljusted by the receiving operaerials crected in their back-yarda- tor until the circuit responded most readily to the wars he wished to receive: he then got a maximum eagerly taken up by the professional į mood bracelet. of response from that ware, and a, minimum from other waves of dif ferent length.

The use of Short Wave had been

users. For example, at Stonecup

Air vibrations lying between two fairly well-defined mits produced the effect of sound. the lower Huit being about 16 vibrations per second-the bottom note of an orgar-and the upper limit about 20,000-30,000..

Aether Waves, Sound waves travel as a vibra- tion of the molecules of the air. In wireless, however, we were not concerned with vilrations of the air, but of the medium known as turned from a high frequency eur the "Aether." The principal Aether waves in the order of their reat into a direct current and Besides Stonecutters, the G.P.O. ware-length were Radium Rays, "amplified." increased in "X" Raya, Ultra-violet Rays, strength. Light Waves (Violet, Indigo, Blue,

These operations are performed Green, Yellow, Orange, and Red), by the Receiving Valve. Infra-red Rays, and lastly Wireless Waves. They differed in wive Tength and frequency, and in conse. quence produced

their different effects. Light waves were about a millionth of a metre in length, whereas the longest, useful wireless wave was about 20,000 metres.

tere in addition to handling all In order to make the received the traffic of the China Station on had to be current work the telephones, it it, they were in communication

detected that is, every night with the Admiralty.

These acther waves have only two things in common, firstly, that they all travel at the same rate about 186,000 miles per second; secondly, that they are all pro duced by the same cause, the rapid movement of electrons. '

Elections

Methods Of Communication,

Mr. T. C: T.. Beck, pair cut glass fruit cups,

Mr. Ho Sai Wa, silver cigaretta

box.

Mr. and Mrs. B. C. Randall, tor- toise shell toilet set.

Mr. P. C. Potts, piano.

MA, Zimmern, pyrex dish with stand.

Mr. and Mrs: Shi Ye Man, aspara gus dish

11

Mr. and Mrs. Sorby, cut glass

vage.

"

Mr. and Mrs. Bowes Smith, pic- ture.

Humphreys, silver crust sets.

Mr. A. E. Clark and Mra, J. A.

Mr. G. G. Wood, blackwood tear. Poys. decanter.

Mr. W. Brackenridge, cut glass

M.I. Co., H.K.V.D.C.-Major H. B. L Dowbiggin, Lieut. H. C. Corpl. T. C. I. Beck, Lee.-Corpl. Macnamara, Sergt. M. M Watson, G. Davidson, Ptes. I. H. C. Highet,

A, E Kendrew, J. H. Davy, A. D. Hartnell, A. McCartney J. Durman, R. Greive and P Sewell-silver salver and cocktail shaker and crystal glasses.

Mr. B. L. Seton Winton, silver and glass sugar bowl.

Mr. and Mr S Jordain, cut glass bowl.

set.

Mr. and Mrs. Hall, silver epet

Mr. W. G. Pirie, cut glass liqueur decanters glasses and tray.

Bride's mother, Austin 7. Mr. and Mrs. Harry Odell, fitted dressing case.

Mesers, and Miss Gubbay, cut.broidered linen luncheon set

Mr. and Mrs. B, H. Charles, em- glass jug.

Mr. and Mrs. E. Nissim, brocade bed apread ...

and Miss Manuk, bors

Mr. d'œuvres dish.

Mr. A. C. Little, pair silver and Mr. Archie Nissim, pair of cut glass butter dishes... giaas decanters.

Mr. L. Reidy, cut glass vase. Dr. and Mrs. Macgown, Japanese picture.

operated very efficient services from Hong Kong, working with Manila, Borneo, Indo-China, etc., which were used both for ordinary public - Mr. and Mrs. Evans, carvers, traffe and for the weather reports Miss Fowler, porcelain cruet set. from which the typhoon warnings

Miss Judah jade pin and paper "are compiled.

knife.

card tray.

Mr. and the Misses Ezra, silver

'Mr. W. van der Steen, black glass plate with lotus leaf stand.

Mr. Komor, embroidered Japanese

screen.

A wireless wave was created by a very rapid vibration of electrons in an serial wire: a free wave was

Short Wave Broadcasting. emitted which spread out over the surface of the earth; the wave on

The British Broadcasting Co. striking another aerial wire tuned experimental programmes.

were also using ahert waves for Their to respond to it, produced a similar Loadon programme was transmitted rapid vibration of electrons which, on three different wavelengths- being suitably treated by a wireless firstly, about 300 metres, for re- receiver, produced a steady cleeceivers close to the station: second- tric current.

ly, about 1,800 metres, for more cloth. The wave, however, must be distant receivers im maltreated in order to affect one thirdly, about 24 metres, for the England: of the human senses and convey colonies and Dominions. This last meaning which might take one of programme..could generally be re. three forms:-Morse Telegraphy, ecived in the Colony between the Radio Telephony, Television. hours of 3-0 a.m. in summer and 10

p.m. to 8 a.m. in winter. The re ceiver required was fairly simple to handle, and cost about $200 to buş.

Morze Telegraphy.

Matter was composed of Ettle bricks termed "Molecules." Moje- cules were composed of soaker elementary bricks called " Atoms." In Morse Telegraphy the wave The Atoms again were composed of was chopped up into long and short tittle electrical bricks called "Elec- Impulses by the sender with a trons" and "Pretoas "-small morse key, and produced long and negative and positive "electrical short impulses in the receiver tele- charges. Electrons wcro act in phones short and a long mean motion in a conductor by the ap-ing "A" 4 long and 3 shorts plication of

"B," and so on. " Ectromotive an Foree, from a Dynamo or Electric

Wireless Telephony, Cell, and their fow in the sondue. The science of wireless telephony tor is termed as Electric Current

was of great interest just now, on Wireless,

account of the popularity and im portance of broadcasting.

The two essentials of any wire, less set were colla of wire called

1

The human voice did not travel Inductances, and combinations of as a sound wave from the mouth of metal plates with air or some other the speaker to the car of the insulator between them, called listener any more than it did in Condensers. An Inductance had the case of line telephony when an electrical property correspond the speech w turned from ing to Weight, and a Condenser a sound wave intò a variation of cur property corresponding to Springi rent hy means of a microphone, and ness or Elasticity..

from a variation of current back into a sound wave by means of a telephone receiver."

The motive force that maintains the oscillation was the Wirelege Plant which might be one of fouz types-The Spark System, the Poul zon Arc System, the High Fre quency Alternator System, and the Valve System: but the first three had been practically superseded by

the fourth.

The Aerial,

&

Good Communications.

Mr. and Mrs. White, linen tea

Mrs. D. Gubbay, pair of silver

vuses.

Mr. and Mrs. Hille, lacquer trays. Mr. and Mrs. Ar da Silva, fishi knives and forks.

Mr. and Mrs. R. Meyer, pair sweet dishes.

Mr. and Mrs. J. F. Wright, jr., silver cruet set.

Mr. E. Abrahan, silver silver. Mr. and Mrs. Darby, pair cut glass decanters.

Mr. and Mrs. Bannerman, electric

Mr. and Mrs. Hannibal, cake

If it was true, said the lecturer in conclusion, that Evil Communica tions corrupt Good Manners," he thought it was also true that good communications make for better chafing dish. methods of interchanging ideas basket. understanding, and the improved might help in educate the races of the earth to un-smokers set.

some degree to

racial hatreds were inherent in derstand each other better. Some. national character, others were due to stupid misunderstandings, which wireless might help to slove.

Questions And Answers.

Mr. and Mrs. Dunbar, cloisone

Mr. and Mrs. Nelson, cheque. Mrs., Moses, pair scent bottles. Mr. and Mrs. Forbes, marble

statue.

Mrs. Hurley, cushion cover, Mrs. Oxberry, cushion cover and dress hanger.

Mr. Walsh, cut glass bowl.~ Misses L. and G. Ellis, cut glass

At the conclusion of the lecture several questions were put by the audience, among them whether it was possible to permeate the bowl. Heaviside layer by means of wire. less waves and thus communicate frame. possibly with Mara The lecturer

Mr. and Mrs. Gregory, silver Capt. and Mrs. Bultitude, Chinese

Capt. and Mrs. Thompson, pair silver bottle stands. Chinese vase.

Mr. and Mrs. Dunn and family,

уляе.

Mr. and Mrs. Johnson, cüt glass decanter.

Mr. and Mrs. Chapman, electric. toaster.

Mr. D. Ogilvie, silver salad spoon and fork..

Mr. and Mrs. Gardner and Mr. J. Garduer, embroidered tea cloth and serviettes,

Mr. Shrubsole, cake basket. Mr. and Mrs. Chaa Fo. Sien, pair "silver aweet dishes.

Mr. and Mrs. R. Pestonji, aspara gus dish.

spoons.

Mr. Li Taz Fong, silver tea

Mr. and Mrs. Cousins, silver coffee spoons.

Mr. and Mrs. Ho Ki, Japanese lacquer box.

Mr. and Mrs. Rossi, brocade

cover,

Mr. F. Angus, tes cloth. Mr. and Mrs. Priestley, cut glass decanter.

Seanet Freres staff, ivory chop

sticks and rice bowls,

Mr. and Mrs. Taylor, silver tea

spoons.

H.K. Ladies Hockey Club, two pairs of nut crackers.

Miss D. Tassel, silver and glass jam jar.

Mr. Mognaschi, cut glase cocktail glasses and tray and silver shaker. Miss V. Tefford, dressing jacket. Wang Hing, silver toast rack sweet dish

Misses C. and G. Smith, silver

Mr. and Mrs. J. T. Bágram, cut glass bowl

Mr. and Mrs. Dutton, enamelled cherry forks.

Sir Elly. Kadoorie and sons, cut

glass bowl and stand.

Mr. and Mrs. D. and T. Storch, onal glass rase.

Dr. and Mrs. To and Dr. E. To,

De Vilbiss perfume light.

Mr. Cohen, silver kettle and stand,

Mr. E. Sadick, tea spoons. Mr. and Mrs. W. Goldenberg, ten eraet cloth.

Capt. Liddel, ten spoons and sugar tongs.

When no speech was occurring, a steady current would flow from the cell through the microphone, said that personally he was not vase lamp. along the line, and through the convinced of the existance of the

carrier" telephone, which was called a layer and thought that possibly the microphone was spoken into, this some other means. With regard to current. When the waves were confined to earth by current would be varied in strength, communication with Mars he could Mr. and Mrs. Cano, cut glass of "modulated," by the altera say nothing. Having generated in the electric- tions in resistance of the micro- al oscillation in a wireless circuit, phono caused by the voice.

His Excellency asked how long it

Prof. and Mrs. Digby, silver e took a wave length to make the set. one must get it away from the

The same principle was involved complete circuit of the earth and station by the "serial! wires. in wireless telephony. A continu received the amazing answer, one bar, embroidered. tahle cloth and Mr. M. Hoare and Miss E. Dun. These were suspended from maste ous high frequency carrier wave fourteenth of a second.

Copkins. and connected to the wireless plant was emitted which, when detect His Excellency in proposing a Mr. and Mra: d'Almada, mother by other wires termed "feeders." ed" in the receiver, was turned vote of thanks to Major Miles said of pearl ash tray. The combination of overhead-wires into a steady current. By means that he had felt before the lecture and the ground below them con of a microphone the voice, ef a that he was ignorant and now he

Mr. and Mrs. T. Gould, cheque. Mr. and Mrs. Berg, silver and stituted a Condenser." The wire speaker varied the strength of this knew it. Wireless was one of the glass sugar bowl, less plant caused electrons to rush save at the various audible fre- great things of the future and, the Mr. and Mra. E. Abraham and up and down the feeder wires, toquencies that go to make up speech, greatest wonder of the modern Mr. P. Tester,, pair silver brush neoklace and iced water jug... and from the aerial, charging it up and in consequence the telephone world. They had been highly pri and comb. to very high voltages with respect in the receiving circuit reproduced vileged in having Major After to Mr. and Mr. S to the earth which resulted in a the speech.

fell them all about it

Idiab...

butter

Mr. and Mrs. A. W. da Roza, tea. spoons.

Bridegroom to bride, gold cigar-

ette caso.

brushes and comb.

Bride to bridegroom, silver hair

Bridegroom's mother, moozistone Aunt Mima, travelling clock and palz candlesticks...

Amah, tumbler holders. Kwa Chinese dishes.

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