1924-11-22 — Page 10

HONGKONG TELEGRAPH, SATURDAY, NOVEMBER

RADIO NOTES AND NEWS.

Low-Loss Colls and One Control for Detector.

LONG RANGE FEAT.

Signals Heard within eleven

beo on a voyage to Etah, Green- land, equipped with a full com- ploment of specially designed radio apparatus and sluco her departure the polar ship has Degrees of North Pole.

boon in almost continuous com- Eclipsing the recent nobleve.munication with station KDRA Upon the low-loss doll, depends correct. Otherwise, strip off one

short ways transmission and is muck, of the success in constructura at a time until the dial ment of invading the southern This station has plonesred in renees 80 for a $60-meter stallon and wostorn parts of South tion of a simple detector.

the This will enable you to cover all America, when KDKA'S signals poolally equipped with experl- The tapped inductance,

mental apparatus. woro received on Fuocossive variocoupler or variometer bas broadcasting wavelengths.

The course of the "Aratlo The two coils, A and B, are act nights at Santiago, Chile, the ex-took her to Blockhead Island at given way to the honey-comb primary and secondary, the basket alongside each other, with the perimental short wave tranemis-

and soross Davie Strait to weave, diamond weave, spiderweb centros coinciding, about an inch sion of the Westinghouse station the mouth of Cumberland Gulf or similar type of winding. For it apar'. Two or three pieces of penetrated the far north to within Godhavn on Disko Island off the has been definitely established wood an inch long may be .sot approximately eleven degross Groenland Coast. The veseol] has there is a minimum of lose in between them for this purpose; the North Pole, and was com- then crossed; to Pondo Inlet and reception by means of such coils, and nails hammered into the end plotely received by Bill Choato, north to Dundas

A simple detector oirouit with through tho coils, to koop thom radio operator on board the Can Devon Island; north to Craig)

such coils has only ono control, together. that of the variable condensor.

A piece of of doweling about

dian Government steamship "Arotio", according to cable dig

house Company, Limited.

Harbor on

Harbon on Ellesmere Island and from thoro to Etah. From Etab

of MacMillon.

Arriving at Refuge Harbor and finding navigation conditions good for a venture north, the

Once the primary and secondary Bý-luch thick can be used to hold patchos received from George A. the expedition sailed to Rofuge | lowloяs tuners are fixed, there is the colls upright. Bore a 34-inch Wondt of the Candian Wosting Harbor, the winter headquarters no longer noad of tampering with hole in the caseboard, where the them to tune in a station. The colle are to go, put the dowel into ono of the openings of the larger condenser does that.

A good type of coll for the sot coll, leaving enough to be glued

hero is a simple into the hole in the haso. considered

The variable condenser should spiderweh. Both the primary, A.) and the secondary, B. are wound be of the best low-loss type A 23-plate typo in similarly around a two and a half available.

Of course it should be inch inner circle. The best way called for. to do this is to set an odd numbor vernier controlled.

The fixer condenser, C2, should of spikos, nine or eleven prefer- ably, ovenly around a thick wood be of .001 infd. onpacity, and the hub, 211⁄2 inches in diumotor, and grid condenser, C3, should have wind wire in and out about these, capacity of .00035 mfd, with a

A BATTERY B BATTERY

BOCKUP OF ONE-CONTROL DETECTOR

224 V

a

going under two spikes, over the variable grid leak of from 1 to 2 Hoxt two, under the next two and megohms.

so on.

Coil A gets a'x windings of No.

The phoce jack, J. is of the opon circuit type if no audio amplifier is to be added to the

16 DCC wire while coil B is detector. But it should be of the! wound with about 48 turna of No.

closed circuit type if an amplifi-

for

18 wire. The exact number of or is attached. windings depends on the conden The tube, depending on the use Бег. Different condensers give of dry or wet batterios varying results, therefore the filament current, may be either | best way to learn the exact num-UV-199, UV-200 or any other bor of turne needed is to ex-dotector of raputablo mako. periment as follows:

POLITICAL LECTURES.

Wind about 55 turns on the secondary, and when you are Columbia University has started finished with the set and roady a new series of radio lecturos to listen in, docide on a definite through Weaf, New York. This station with a wavelength of, say, is on" Politics in Theory and 360 moters. Turn the condensor Practice," and is given every dial until this station comes in Tuesday evening. Professor strongly and note the roading. Raymond Moloy, associato direc- If the reading is at 30 on the tor of Banard College, will be in dial, the number of windings is chargo of the courro.

wore

Arctic" proceeded northwest

point le considerably farther from there to Cape Sabine, which north than where either. Perry or MacMillan wintored.

1924, FEATURE SECTION).

Wm. POWELL Ltd.

This foat is considered the most wonderful radio BOCom- Bonson repleto plishment of a with record-breaking feats for long distance-radio transmission. The signals broadcast from the East Pittsburgh station picked up by the "Arotio" at Capo Sabine many miles north of Etah, the winter.hoadquarters of Donald MacMillon, the noted Arctic explorer who has just

More than 100 broadcastors will Vests.-Half or Long Sleeve. returned to civilization, in the continuous daylight zone and in participate in the trans-Atlantic Drawers.-Keenor Ankle Length. apite of the very heavy aummor tests to be conducted during In-

aleo static.

ternational Radio Week, Novem-

Combinations. Some months ago, the "Arctic" bor 24 to 30. European broadens.. slipped her moorings at Que-tors also are ready to co-operate

WHAT'S

THE IDEA -

DO YOU KNOW

IT'S ELEVEN

O'CLOCK ?

WASTING AWAY YOUR TIME WHY --

THE IDEA

I'M SURPRISED

INTERNATIONAL WEEK.

GET UP THERE TO BED - DON'T

LET ME CATCH YOU UP AT

THIS HOUR · AGAIN

SAY

ARE YOU COMING TO

BED OR

AIN'T CHA

all sizes.

phono Contral 3148.

AUTUMN and WINTER

UNDERWEAR

NOW SHOWING

Our range of Underwear for Autumn and Winter has been very well selected. It has been made for us by the leading

British Manufacturers and comprises the

celebrated "Viyella" and "Theta" Brands,

also our Famous "Dome" Make.

Hose and Half-Hose We have received a new stock of Cashmere and Worsted socks in many plain colours and fancy designs.

Frics from............$1.50

Golf Hose

In Lisle Thread, Cashmere,

and Fingering Wool in many new designs.

Prica from............$4.00

DOME MAKE

WILLIAM POWELL LTD

TRADE MARK

DOME MARK

HỒNG HỒNG

This is made expressly for us and constitutes the utmost in under- wear value. It is fully guaranteed and will be replaced if found unsatisfactory.

$4.75

Prico from

We invite your inspection without obligation to purchase.

Wm. POWELL, Ltd. Gentlemen's Tailors and Outfitters,

Hongkong Hotel Buildinga,

GECOPHONE

PIGEONS AFFECTED.

Pigeons flying over a radio station at Patorna, Spain, were found to have been affooted by the waves transmited from that! etalion. When they flow over the aerial they were seen to hesitate in their couTBO.

L

CIGARETTES

“LISSETŤ & MYORS TOBACCO CO.

TWO VALVE

AMPLIFIER.

THE SINGLE & TWO VALVE AMPLIFIERS

CAN BE USED WITH GECOPHONE

CRYSTAL OR VALVE RECEIVING SETS;

NO TUBE BLOWOUTS.

A fuse has been manufactured

for the prevention of tube blow- outs. It slips over the filament terminals of any standard vacuum

tubo.

RADIO.CONCERT HALL.

A large hall has been opened

in Genova, Switzerland, for the public, reception of European radis concerts. The admission fee is 50 contimes a person.

MODERN CLASS US.

Station Weaf, New York, has tatarted broad oseting new musical selections for a half bour

BC 2620, LOUD SPEAKER overs Friday night. ThesÓ |

$48.

THE GENERAL ELECTRIC CO.

selectians will include, the best from American composers and are intended to introduce tho fadio pubilo to the more olasnic music of the day.

BUSES WITH RADIO.

Part of the regular, equipment Ton eaoh of the Interstate Stage

Line büzegt

in and outot

Chesterfield cigarettes

are a blend of the finest

grades of rich, aromatic Turkish and smooth,mel. low American tobaccos

Chesterfield

CIGARETTES

LIGGETT & MYIRE TOBACCO, CO

BURIED HISTORY, Exploration of the barial obamb Prince's To has to be shape

They Salish

nce for

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