1925-02-18 — Page 9

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RADIO NOTES AND NEWS. Tubes Neod Testing When Being Bought.

Tubas, the hoarte of radio ro- coivors, ard as fioklo as mankind

In one set a tube will work wonders. In another tho samo tubo may fail.

The reason lies in the tube and its treatment, even more than it doos in the hook-up. For tubos,

delicate instruments that need particular caro,

аго

A look-up may be no arranged that it will drain a tubo of its power in a short time, unnoces. sarily, Or, ovan with the hook- up economical so far as tubo uso concerned, the operator may put too high a current on the Blamont for the good of the tubo. This is why the same type of tubo may bring in distant stations through ono recolver and be baroly useful for DX through another. It's the receiver and the operator to a great extent.

Ordinarily overy tube is fully tosted before it leaves the factory. But for individual satisfaction the fan should have each tubo tosted again before ho buys It.

the United Blatos with his short wavo tests.

*

MERCURY VAPOUR TUBE.

A moroury vapor tubo design- Priess has been managor and ad by two Frenchman is said to vice president in charge of on-amplify incoming radio signals a ginooring at tho Do Forest million timos. It is being sub- Company plant. Ho has resigned jected to exhaustive experimenta this job to direct his own newly by radio engineers. established company, which will now fivo-tuba soon put out a raflex Priess has designed.

WORLDWIDE RADIO MEET.

Sought By Washington Enthusiasts,

Noed of an international radio

TWO 1099 CAUSES.

То слиная for losses in a ro- colving not are: I, Resistanco of wires or other parts, 2. Absorb tion

alestro- of onergy, from magnetic folds formed in the sot.

STATIC REDUCER Pierro R. Worner of Brooklyn, conference was expressed time N. Y., has designed a variable and again during the sessions of loop which, he says, will roduco the Third National Radio Con-statio intorferance, The loop con forence bold in Washington. bo flattonod out, rained or lower-

As the confereca struggled through a mass of controversial, unill the best form is found

for clear roooption. questions in their efforts to put national broadessting and other forms of radio transmission on a systematic basis, they realized the necessity of cooperation with all other governments in the samo matter.

Elimination of ship spark interforeneo could not be discuss- ad without roforonco to foreign ship practices. High power or trans-Atlantic broadcasting also required consideration of foreign experloneo and foreign, coopera tion.

-

RADIO IN HOLLAND. Holland has seven privato and

two stato broadcasting stations. For all these, there are only about 20,000 listonors. There is no license foo for rocalvora.

BROADCASTING DRAMATIC

HISTORY.

The British Drama Longue has arranged for a short series of illustrated talks on the history of the drama to ho given by the British Broadcasting Company. The rosult has boon to stross the importance of a worldwide The first of theso talks was givon at least the recently, the hour arranged boing conference with largest countries of both homis-9 p.m., when Miss Elsie Fogorty spoke on Greek drama, and Mr. phores in the discussions.

This used to be a complicated operation, for just hooking in the tube and sncing whether it lights is no test of a radio vacuum tube. The measure of light on the filament is useless because light is actually a wasto in vacuum tubes. Taerofore a special instrument has boon dovised for tosting vacuum tubes in ono oporation. It is called a tube-teater and givos instantreadings with respect to the

Last April a preliminary radio Lewis Causan and mombers of tubo's oscillation and sensitivity,

This tubo tester should bo ap conference was hold at Genova, Migs Thorndyko's Greek play plied upon the purchase of each and from this a call want to all company illustrated it with dra tubo. Otherwise thore is little interested countrion for another matic selection. prospect of having a tube replaced.international moot, for the pur- Manufacturors do not replace a pose of ironing out some difficul- tube unless there is an actual flaw ties that have arisen since the in any of its manufactured parta. last conference at Washington in

1920.

After it has once been used, oven for an hour, thoy contond the cause of a tube's failure to operate well may be just as much due to misuse as to faulty-construction.

21

SANDMAN SIGNED UP, Val McLaughlin, sandman" for station Woc, at Davenport,

Among the subjects to be taken up at this meeting would be:

THIRTY OFF AIR. Thirty broadcasters quit send- ing during Septembor, reports the U.S. Department of Com- morco. But almost as many now onos sprang up at the same time.

1. Re-allocation of wavelengths

PATENTS QUERIED, among amatours, commercial sta- tions, broadcasters,

ships and Now comes a Frenchman, M. governments

Theso Lovy, to question the patent bands to be universally ro- rights. of Major Edwin cognized.

Armstrong to the super-hotor-

atations.

H.

2. Redistribution of initial call odyno and supor-regeneration

Is, has been engaged to record a lottors among countries, especial principios. Levy doclares bo bad number of her bedtime stories only those that come into con- those ideas and put them up long the phonograph record. She has

forence since the last distribution before Armstrong had them. boon known nationally for hor

was made. child stories even before the timo of radio.

WHO GETS CREDIT FOR REFLEX. Who invented the principle ?

roflex

The name of Grimes may be recalled immediately. But William H. Priess, Now York radio onginoor, objects.

It was he who designed the first rolex set and in fact named it, ho says. Of course, La Tour and others in Europe had the idea long before anyone ulse, but thoy noglected it and it wasn't made popular until only a few years ago.

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3. Consideration of a universal radio language liko Esperanto, or The army communication not Ido, or

Ilo, so that signals includos more than 100 army- throughout the world may be owned radio stations throughout understood roadily by all the United States, and also has listonora.

soveral loased lines. It has ro- 4. Reservation of wavelength placed to a largo extant the use bands exclusively for telephony, of the telegraph. distinct from radio tolograph channels.

• •

BEYOND ULTRA RAYS. 5. Roservation of the same Tiny rays, oven bayond the bands for amateurs throughout ultraviolet rays of the solar spootruin, are said to cause the

the world.

G. Limitation of distress wave-growth of tissue by division of lengths.

SHORT CUTS.

Things to know in a Set Make a tube socket for two conts with four soldering lugs. four worews and a block of wood two inchos squaro. Bend tho lugs so they will receive the prongs of the tube and screw them to the wooden socket" hase.

A coil binder, or varnish, can bo mado from old kodak filma die-1 solved in acatone. Before the films are dissolved, however, the omulsion on them should be loosened with ammonia and scraped off with a knife.

Crystals may be cleaned by scrubbing with a toothbrusii'dippad in alcohol. After they are oloaned they will be almost as good as if the surfaco is

ΠΟΥ

touched by hand.

not

Dry out coils in your sol ocoa. sionally in wet weather by placing

a lighted electric lamp inside the cabinet for an hour or so.

Duet should be removed from variable condongors ovóry month or so by running a pipe cleaner between the plates.

UNITENNA" ON SHIPS. "Unitenna" is the name given the system by which multiplo rocoption and transmission is pormitted by one aorial. U. 6. warships and passenger liners aro already equipped with this dovico,

CRYSTAL GENERATORS. A young Russian radio enginoor, M. Lossov, has produced a crystal transmitter for local communication. It is said to be a combination of a zinoite crystal and a stool point,

DX ON LOW WAVES, Rio de Janeiro, in Brazil, reports having hoard Dr. A. H. Taylor of tho Naval Research Laboratory transmit on # 54- motor wave recently. This is a distance of 4780 miles. Dr. Taylor has succeeded in covering

living colle. A Russian scientist, Dr. A Gurwitsch, has made toats on this.

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Telephone 388.

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Electro-Plating

WE

7E have recently installed a com- plete plant for plating, bronzing and lacquering at our workshop in the basement of Pedder Building, opposite the Hongkong Hotel,

All work entrusted to us will be carried out under expert European supervision.

Whether it be table silverware or fittings of any description, absolute satisfaction is guaranteed.

Surgical

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Inspection of our plant is cordially invited and enquiries solicited for any form of plating in-

GOLD, SILVER, NÍCKLE or, for Oxydising, Bronzing and Lacquering.

Price list on application, special quotations for quantities..

DODWELL & CO., LTD.

Machinery Department.

Telephone 1030,