1924-12-06 — Page 8

HONGKONG TELEGRAPH, SATURDAY, DECEMBER 6, 1924. FEATURE SECTION).

RADIO NOTES AND NEWS. Egg-Shaped Condensers Equalise Dial Settings. Condensors, the main tuning with wavelength or frequency: controls of receiving apparatus, the semi-elliptic typo, B, which aro to-day made with greater tunos evenly around the dial in precision and are the results of accordance with wavolongth call- combination more definite experiments than bration, and O, a

that is designed for in former days, says an American plate

frequency calibration. Bervice writer.

According to H. F. Mason, radio amateur and co-editor of QST, the official amateur organ, type D condenser, in which the movable plates aro loft. aomi- circular and a part cut out of the stationary plates might be the most economical form to use.

observations made hore on day. The end of the series of oold light signals from the long wavo waves in January, did not at once trans-Atlantic stations at New restore transmission conditiona Brunswick and Tuckorton, N. J.

early winter but the engineora of the Bureau of to the uniformity of autumn Standards, bave concluded that and cold weather berofits radio trans loft a condition of instability which persisted througli the com- mission.

Although signal strength was paratively mild cold of February found to be quite uniform during and early March. During this! tho signals frequently most of the year, with the com- timo ing of the cold waves of January. fluctuate, going to high values for The simple semi-circular typo of variable condenser is giving

1924, the signals wore observed a few hours and then returning way to a simt-elliptic form that

to ring to more than twice thoir to normal without any obvious connection with weather condi- After March 19 those is Bald to be more accurate in

normal strength.

At the samo time there weretions. tuning. Engineers concerned with this part of radio manufacture

deviations of many dogross to irregularities entirely cossed and have tested all sorts of designs

the apparent directions of the transmission again became nor sondlag stations, as indicated by mal.

This effoot has boon long ob and are oven now trying to attain

At any rate the bost typo, it in the radio compass, even in the a batter form than the latost

generally conceded, is tho kind forenoon when long-wave com- sorved. In Hongkong, much! innovation.

The difficulty with the simple that gives a straight lino calibra-pass bearings are generally free better reception is recorded in the semi-circular rotary plate was tion, that is, divides dial readings from error.

that broad-casting wavelengths equally from zero upwards. Tho were bunched too closely to be three types, and the fourth sug- differentiated clearly, so that low gostod typo, shown hero, aro wavelength stations that happen- straight line condensors, but they ed to be on the air at the same differ in their individual fane, time, had to be dispensed with tions. in the radio fan's attempt to: listen in.

This brought the radior loaders to the laboratory tables, with the result that they decided on a form of rotary plato that would

Sinco wavelengths and froquon- cies, and not capacity, aro tho measuremonts by which we tune in, the host form of condenser would ho either B or C. Those offer avenly distributed tuning,

18

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DIAL SETTNES

Characteristic curve of (n) "straight Une" and (5). "square law" condenser.

SKETCHES OF STRAIGHT-LINE CONDENSERS AND CHARACTERISTIC CURVES, SHOWING A, EVEN WAVELENGTH DIAL SETTINGS, AND B, UNEVEN RISE IN CAPTITY,

divide the wavelengths aqually according

the dial. around

Law frequency. form wavelengths, under this of condanser, could just as equally be tuned in or out as the higher bands,

to wavelength or

EFFECT OF COLD.

Strengthens Wireless Signals.

Washington. Cold weather more than doubled the strength of radio signals transmitted during tests made up to recontly ac at the Bureau of Standards horo.

Three forms of rotary plates have bron subject to these ex- porimonts. They are the original semi-circular plate typo, shown as A in the accompany drawing, which tunes ovenly in cordance with capacity, but not

From those tests and other

Uncle Sam's newest lightship, the " Five Fathom," is ready for duty in the lighthouse service equipped with one of the most The lightship wil powerful transmilling and receiving sets at sea. rend continual radio warnings day and night, when it fakes lis position off Cape May. Stanley R. Shumway, the ship's radio operator, is shown at the key of the franamiitor.

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WITH MUSICAL HONOURS.

The Government's Demise.

"Listeners-in" took the news of the Government dofoat with a during the last exciting hour! in tho House of Commons: sent out short now i mosɛages con- corning the progress of the debato and the divisions, but those were Į superimpɔsed on the programmo of the dance bands transmitted from the Savoy Hotel, roports & London paper in mail week.

The effect produced by this mixture of politics and entertain- ment was curious, and seemed to make the drama of the night' a little theatrical. The music which had heon drumming into the ears or listonars faded about a quarter to 11 to a soothing whisper, and a clear voice from Savoy hill stated that Mr Thomas in the House had just said: "Wo are going to the country, so wo may as well got the facte right now." Back came the music in full volume, and musicians were heard singing," It ain't goin' to rain no mo" More syncopation followed, Big Ben boomed the hour and the voleo again broke in

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with tho nows that the Houso had tion. It is exproted soon to poo. divided on the question of whether mit use of radio, with the pay- thevote should be taken on the ment of a moderate loance. for, consuro motion or the Liberal and the construction of apparatus amondment. Half-past 11 bad by amateurs. aounded before the Orpheuns were suddenly cut completely off, and the statement came through that the Government had been defeat- ed by 364 votos to 198,

* ·10

BTRIKING OUT ALONE.

16

RADIO HUNT IS ON. Switzerland has a new "hunt- ing game," thanks to radio, A bost with a small transmitting sot is the "pray" which other boats, the "bounds, with The South Amerloan radio field receiving sets ard supposed is to be ontored alone by the to locate, Undor cover of night largest radio organization in this proves an interesting-gamo, Amorion. Previously this com pany bad boon allied with the British, French and German in. terests for the distribution of their producte by one sales agonoy...

--RUSSIA”IN BUSINESS. Rusele plans

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FISHING BY RADIO, - Herring fahing off the coast of Bcotland has the aid of radio and airplänes: The planes, with trans- mitting asta, kpok the fish and transmit the information, to the waiting bokiman. That simplides

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