1924-03-15 — Page 13

THE HONGKONG

PH

SATURDAY, MARCH 15, 199

RADIO NOTES AND NEWS:

YOUR BEST

INSURANCE

AGAINST FIRE

IS-

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FURTHERMORE

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Full Particulars From :

The United Asbestos Oriental Agency, Ltd.

2. Queen's Buildings

Tel Central 236

The System of Plate Tuning.

The problem of designing This is, of course, little disadvan- a tubing system which will tage if reaction" is employed. efficiently and conveniently Basket coils aro very suitable the lower wave-lengths, cover a very wide range of ware CD

The system may be developed so as to enable a wider wave-length range to be covered by sliding the plate between two coils which are connected

lengths is one which has always whilst the higher bands may be axervised the minds of those reached by thin bapeycomb interested in wireless. Variome-colls. As little wax or shellac as ters of various types, tappad possible should be used to hold inductances, variable condensers, the coils together, for it should are all in use and all have their be remembered that it is the adherents. At the same time all inductance of the coil which is have their disadvantages, writes variod and self-capacity is un- E. J. Wyborn in Popular desirable, as it tends to flatten Wireless Variometer tuning is the tuning. generalty conceded to be the most efficient, hat a good variometer is somewhat expensive, takes up a good doat of späce, and covers · a

so that their rathor limited wave-length range. The range can be inc eased, of mutual inductance increases the course, by the use of series inductance of the whole. The loading coils, but the

effect of the plate is to reduce the tubing tange with each coil then inductance of each coil and also becomes relatively amallar the to remove the mutual inductance higher the wave-length. Tapped of the coils. In this way a wave- inductances involva two length range of 300 to 900 metres switches, for coarse and may be obtained with a single fine tuning respectively, and pair of coils, & rauge which either dead and losses of com compares favourably with that plicated dead-end switches. For obtained by other methods. convering a very wide waves! The spade may be moved length range, plug-in coils with directly by means of a handle variable condensers are very con-ar it may be arranged at the end venient, but if the tuning is to be of a short radial rod so that it is kept sharp and the efficiency high, moved by rotating a knob." small condensers and consequent- Regeneration is mort convient- ly a large number of coils arely obtained by capacity reaction, a method which has many essential

advantages over the more usual The object of this article is to method. The necessity for a large' bring to the notice of readers of number of interchangeable reac- Pupalar Wire ess another systemtion coils is obviated, as a very of tuning which is very little wide wave-length range may be known, but which has many ad-covered by using a variable con- vantages. Those who have had denser in conjunction with a experience of A. O. power work number of small fired condensers, will remember the disastrous con-which may be put in circuit, one sequences of short-circuiting the by one by means of a switch. secondary winding of a power The principle may also be transformer. The effect is practi- utilised for tuning bigh-frequency cally to destroy the inductance transformers of the two-basket

SYNCHRONOME

ELECTRIC CLOCKS,

THE

"SYNCHRONOME

:System of Electrical Impulse Clocks

consists of

· Elantrianlly-Deiván Pandulu which aparates · asp

.. The

Pendulum

4 combined with 2 aswala switch 19 that both the tima-keeping and awliching "functions Bre parlsenad automatically Aad ideally perfect BLAMY.

C

Each dial has unly a

movamani behind it, yet ibis simple mechanism secutes

YOTAS

*

tuma-kesping

any

uniform an

without winding other attention

They are corruel ta wiikin half

talanta ia aix months. Let 盛 quolá you for complets installation.

SHEWAN - TOMES & CO.

Solo Aganis..

TAL TOL

Twink

CLEANS AND DYES

AT THE SAME TIME

TOWN ON TIME BY RADIO.

A real cigarette

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That quality taste of choicest Turkish and American tobaccos blended in ex- actly the right proportions.

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Ches

esterfield

IGARETTES

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hesterfield

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Leer & Mrs Toracco Co., U. S. A., Manufacturer

GECOPHONE

A REVOLUTION IN WIRELESS VALVES

D.E.3

MARCONI VALVES.

MADE AT THE OSRAM LAMPWORKS

800 HOURS USE FROM ONE DRY CELL FILAMENT CURRENT 0.06 amps.

THE G. E. C. OF CHINA LTD.

Telephone 518.

Queen's Buildings,

Hongkong.

Medusa, New York, knows exactly when noon arrives, for Mr. C. J. Waldron has equipped the town church with a radio receiving set, by which he gets time signals from Arlington through WGY at Schenectady, Immediately on receiving the report, he rings the church bell, proclaiming the noon bour to the farmers of ibe district.

Lade "Di" says

"If it isn't exactly the shade you want, you can Twink #!"

1t-the Sales.

“[35 monderful save, makin

mel the nails remon sight up is the volum Alength of well in blog in the sent som ble me a sweet Stile evenenat – forverall visstil bargúmma sets, they were at the robe cut deus ne barnams while son can

and Tank Them?

Tivre zze twent-liat skades al twink, and the shaken van die are thor You need never weari

• OF Ja compra frocknife Twink man Fain the direction curately, and set;brful resul. Jaz certains,

Of di Clemen, Gomar, Vapor, Gilman, Eleuters, an

Spy S

Angle Nara

S

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لال المراد الله

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And havi

Tenemen

AGENTS-

The Chia Soup Co., Ltd. Shanghai.Hongkong-Tientsin

Hankow-Twinsofo-Moakdan

meetings to consider ways and results, while a wood horn on a means of establishing longhorn made of some, dead' material distance lines," declares Mr.like hard rubber is least likely to the primary winding, with coil type, the copper plate being Minor. "Much progress has been introduce a strange quality." the result that a very large flow slid over primary or secondary made in the last year. Efficient of current takes place. This coil as desired.

and easily available channels of effect can be employed to reduce The chief advantages of the spoken communication are to be the inductance of a tuning coil system are its cheapness and realized." The latter should take the form of convenience. With well-designed a fat basket or honeycomb coil spades it is efficient, whilst considered no factor so far direction of the chief signal and a flat copper sheet of heavy remarkably sharp tuning is long distance communication is gauge constitates

short-possible.

concerned.

the

Which shows that radio still is

-DEATH OF NUTED FILIBUSTER.

General Lee Christmas, the famous American filbuster, who

it is said to have inspired Richard

- WIRED WIRELESS.

in wired wireless may be able to American radio fans interested

obtain a recent publication on this subject prepared under the

officer and the Bureau of circuited secondary. The copper A well-known 2-valve broad. Yel, only recently Mr. David Standards. It is called "Intro

duction to Line Radio Communi- shest or "spade" is provided with casting receiver employs this Sartoff directed a long distance cation, and can be had for 10 a handle and is slid over the coil, system; the aerial and tuned conversation between San thus reducing the inductance of acode coils being contained Francisco and the Iwaki radio Cents from the superintendent of documents, Government Printing in 2 flat the latter in proportion to the area together

ebonite station in Japan. In doing 50 Office, Washingt. D. C. They of the coil covered by the spade-envelope, so that they are chang be talked with the San Francisco cater to wireless enthusiasts in i.e. when the whole of the coil is ad together. The remarkable operator from a radio station at

the U. 5. A. covered, its inductance is reduced results obtained with this parti-Columbia, Mo. making the entire to a minimum.

cular receiver are sufficient talk, with only one relay, over a The spade should be separated testimony to the efficiency of distance of 7000 miles. from the coil by a very thin sheetspade" tuning, which is recom- Delivery of the question and of ebonite or other insulating mended to those in search of a answer by this method, covering material It is essential that the cheap, convenient and flexible à total of 14,000 miles, took only copper spade should be thick, tuning arrangement. In many one minute and forty-five seconds. 364 ins, being suitable other cases it will be found advant By direct communication, wise the efficiency is impaired ageous to earth the plates, as this would be a flash of a second. Harding Davis to write Soldiers by the high resistance to the

Thus, while tests are being of Fortune," and who once led a eddy currents set up in the metal,

made with long distance radio revolution in Honduras, overtura- and the wave-length range is also Proof that long distance com-communication, it is line coning the Government in two weeks, reduced. At first sight, it would munication by means of radio is versation that is still being de-bas died in New Orleans. seem that the efficiency of this not yet considered seriously by veloped. Assured privacy of this

ONE-ARMED PAINIST method would be rather low, but important telephone authorities kind is what makes this method actual experience will show that is presented by the laying of cables still supreme is assured of death at seventy-fira, of Count From Budapest is reported the

this is not so.

for long distance line communica- When radio SELF-CAPACITY UNDESIRABLEtion in Europe.

Geza Zichy, the one-armad privacy, then will ine com

pianist, lyrical poet, dramatist; With a correctly designed An ers of long distance communication lose its prestige. spade, there is very little to manication is just beginning on

LOUD SPEAKERS.

composer, and former "superin- choose between the efficiency of that continent, reports Mr. C. H. "A lond speaker with attendent of the Budapest Opera "pade" tuning and variometer Minor, commercial representative magnetic balance and a horn as a boy of fifteen he lost his- tuning employing the same gauge of a large electrical manufacturer. about two feet long is capable of arm in a hunting accident. He wire. If a considerable wave- who has just arrived in America: very good reproduction of even had Liszt for teacher, and made. length range is to be covered But this communication; Mr. very low frequencies, reports & such headway with its left hand with each coil, the latter must Minor says, will be by wire member of the American Institute that after a time he was able to not be thick, and this involves Radio isn't even considered. of Electrical Engineers. Alumi-give recitals in aid of charity the use of rather fine gauge Engineers of the governments num or micarta diaphragms, ha throughout the world, and became wire on the higher wave-lengths. of Europe are beginning to hold goes on, apparently give the best famous,

ני

results in more stable working.

WIRE SYSTEM PRIVATE!