1924-12-10 — Page 9

THE HONGKONG TELEGRAPH.

VALVE-IN-HEAD

BUICK

MOTOR

CARS

So safely and satisfactiorily have BUICK Four-Wheel-Brakes per- formed upon thousands of Buick cars that not even so much as a cotter pin was changed in building the 1925 Buick brake equipment.

When better Automobiles are builtBuick will build them

For Demonstration.

Please call or Telephone C. 1036.

HONGKONG & KOWLOON TAXICAB CO., LTD.

33 & 35 Des Voeux Road Central.

WEDNESDAY, DECEMBER 10, 1924.

RADIO NOTES AND NEWS.

Use of House Current Replaces "B" Battery.

One of the foxture at the recent such as thunderstorms, nor such Radio World's Fair in New York phonomons fading, although was an instrument which obviates very little of this poours on long the use of A and B batteries. It is wavon. connected directly to the 110-volt A. C. light current in the housol and to the battery terminals of the recolvor.

A

UNIVERSAL RADIO.

of

For fans who care to dabblo

Cities Cannot Limit It. with olootrical connections, a Washington. Attempte method has boon devised by various olties to radio within which they may set up their their limits have been construod own B battery eliminators.

as unconstitutional by govara- Its principle lies in the transmont officials in the capital. formation of a contant À C. volt This opinion, which was antiof- ago of 110 volts to a variable direct pated by Begrotary of Commerce current for datooter and amplifier Hoover at the radio conference plates.

in thię city in March of 1923, when he stated specifically that "the government owns the othor," la the outcome of a peculiar logal entanglement that threatened at one time to Bot local city and stato authorities at with the federal government. varianco

The apparatus conslets of the following parts:

transformer.

A, bell ringing, transformer. B, low ratio audio frequency C1 and C2, two by-pass condon- sors, Amfd capacity.

D, hard vacuum tube, of 201-A type, and socket."

Kl, six-ohm rheostat. 12. variable resistance between 10,000 and 100,000 ohms.

T, 10-honry choke coil. Five binding posts, wire for

connections.

It

to those interested that no lower

finally made WAS

cloar

regulatory body can govern any subject already regulated by Con ETO86.

Last year, when tho radio was in full swing, ond season state was on the point of creating tor," and a number of cition word the office of "stato radio inspec-

the matter of prescribing how giving sorious cousideration to and whon the other should be used. Their only authority for so doing was the so-called "police which state chartere confor on them for tho abatement| The secondary of the boil trans-of nuisances that endanger the foriner is shunted across the fila.health, morals or prosperity of a; ment terminals. The grid community.

In making the connections, as shown in the accompanying diagram, it will be noted that the two transformers are crossed, with опо

torminal of each primary connected to an ordinary' electric light plug and the Bacon- dary terminals going to the Power," oliminator.

BUY A

TIN OF

GLAXO

TO-DAY.

THE CORRECT FOOD FOR

BABY.-

To grow up into strong, andrgotio adult ifo, Baby must have the right food now. He must be able to digost the food easily. his food must contain every material nocossary to bulld strong bones,. and firm healthy muscio, and it must free from tho disonso germus, and dirt.

Glaxo is the milk-food- that answers all thoso requirements. It has been the sole food of many thousands of sturdy, healthy babies all over the World. Glaxo is the correct food for your Baby. Give it to him today.

glazes

terminal of the audio frequency That this special authority transformer secondary is joined should be interested as covering to both grid and plate torminal, the subject of radio communica- shorting those, and the filament tion was regarded by the legally terminal becomes the highest B informed as being little short of OTAQ voltage to the amplifier.

humorous, and practically all

B+ AHA

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LIGARETTES

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Every package of Chester fields contains twenty deli cious cigarettes - each one firm, fresh and full of delightful taste and aroma,

Chesterfield

CIGARETTES

They

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LIGGETT & MTERS TOBACCO CO,

Preserve and Decorate the the Wordwork

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with

TIMBORITE

WOOD PRESERVATIVE AND

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COMBINED

in

Three Shades of Brown

and

Three Shades of Green

STOPS

Dry Rot, Decay and Destruction by White Ants

Tint Cards and Information from

Wilkinson, Heywood & Clark

Alexandra Buildings.

Tolophone Contral 703.

MUST BE TOLERATED.

Ꭱ

JB+ DET.

DIAGRAM SHOWING PARTS AND CONNECTIONS FOR A B BATTERY ELIMINATOR.

From the positive filainent ter-| cities where such agitation had minal of the vacuum tube, oropped out hastily pulled in the connection ruas though a thoir horns and ruled out pro- 10-henry choko coil, which posed, ordinances of this nature. Diay bo tho secondary of A low-ratio audio frequency transformer, from there becoming the negative B torminal to the receiver.

The by-pass condonsors ara shuntedacross to the amplifier side from each end of the choke coil. For the detector terminal to the rocoivor, a variable resistance is installed from the amplifier lino, so that the voltage may lo con- trolled.

With this done, all that in necessary is plugging the elimi- nator into an ordinary electric light socket and attaching the three terminals to the necessary points in the receiver.

Probably no city in the country, outside of Atchison, Kas, notually passed an ordinance of the kind. This was worded so indirectly that it was not rogarded as en- oroaching in a litoral sense upon the recognized and undisputed fodoral powers. It applied more particularly to indefiulte "elect-- fioul disturbances."

WIRELESS EXPERIMENTS.

English Amateurs Alert. Encouraged by the unexpected success of two English wireless amateurs in establishing com- munication with New Zealand, experimentors all over the country complaints aro made that tho aro rodoubling their efforts. But

Post Office regulations are han- pering advances. The Radio Society points out that without The moon, in its various,phases, ispocial permission amateurs may ia believed to influence radioact transmit to countries other rocoption..

than Great Britain and Northern

MOON AFFECTS RECEPTION.

Observations Show Strange

Features.

Observations made by amatours Ireland; and before an amateur Radio broadcast listeners must and reported to headquarters of is given the increased power for koop on tolerating statio, Al-American Radio Relay League long-distance work he must though it has boon found that hero point to this explanation for furnish ovidence of intended thoro is loss static with short the different degrees of static cooperation with foreign stations, wavelengths, it has not yet been encountored at certain timos.

The communication with Now

RADIO FOR AIR CONTROL""""

found practicable to build ro- At present the only observa-Zouland is quoted as an oxamplo Guivers for shorter than the pre-tions mado, in this regard, have of the absurdity of asking for full sent broadcasting minimum. So been on European long wave details, in advance, of the intond- static must stay a while.

British signais, since there have booned cooperation, for no bettor roceiving conditions on amateur could havo furnished this Bido of tho Atlantic any evidence of intended coopera- than in England. Further expori- tion with a Now Zealand amateur monte, however, are boing oonas ho had no ides that he would Cachoslovakia la installing radio ducted on shorter wavelengths be heard there. In this case, in the air servico. Tho Kboly directed oastward.

owing to a special permission for airdromo has a radio controlling Aouording to observations so long-distance tests, the British, atation to keep airlines from far rooordod, while long wave operators were entitled to trans- Prague and other cities in touch signalswore travelling west across mit any whore, but this was not with wosthor changes and other the Atlantic, bad static conditions ordinarily the case. Complaints important information.

prevailed wbllo the now, moon are also made of delays in the was up, or the moon was in its issue of licences, and of the last quarter., Signals were fair, restricted band of wave-lengthe although worse than at any other allowed to the British amatour, times.

who ordinarily might not go

ACID RADIO TUBE.

それ

*

A German invontor has revived The best signale came across below 115 metros, whereas the and Candian ̈au- the idea of a detootor tube filled while the moon was in its first American with a colloidal liquid, an acid quarter or in fall phase. The thorities had granted permission whose particios, finer than dust, least static occurred during the for amateurs to explore the are supposed to act like electrons full moon phase, while the moon possibilities of wave-longths as in carrying the curront through in its first quarter seemed to low as four metros, The Post Offico given a general assurance the tubo. The tube also contains produce a little more statio. the usual three electrodos,

Those observations did not take that applications aro considered into account local, disturbancos, on their merits.

LES ELEGANCES de PARIS

8, Queen's Road Central. Tel. C. 388,

: 0:

Just arrived from the most FAMOUS PARIS SALONS A large consignment of

TRIMMED HATS

at moderate prices.

Inspection cordially invited.

F. C. HIGGINS

TAILOR

Late of J. T: SHAW

No. 17, Ice House Street,

(NEXT TO HUGHES & HOUGH)

TEL 4648.

TEL.

SET FOR EVERY PURPOSE.

4846.

The lan of fana is Peter Testan Jr. of Brooklyn, N. Y.; His radio room, in which he is shown above, proves it. . There he has set up all types of recognized radio, receivers, from the imple

·Copp circult to the supar-heterodyne." Only the crystal est is out. of the layout, and that's in the sitio. A switching arrangembat enables young Tesian to swing any set he desires into instant was,