1926-12-22 — Page 6

THE HONGKONG" TELEGRAPH,

WEDNESDAY, DECEMBER 22, 1926.

The 2 PRESENT PROBLEM

(HER

What to give (HIM

Electrical Gifts for Pleasure, and Use all, the Year round

Table Lamp Lamp Shade Reading Lamp Iron Kettle Bowl Fire Toaster Hotplate Table Grill Shaving Pot Curling Iron Vacuum Cleaner

See them in use at your nearest Elect

Shop

THE CHINA LIGHT & POWER Co., (1918) Lid. Showroom2. Nathan Road, Koglan.

GREEN ISLAND CEMENT Co., Ltd.

MACHINE MADE WIRE-CUT

BUILDING BRICKS

Stocks on hand

For particulars apply to:-

Coff

"SHEWAN TOMES & CO..

General Managers"

Stonego's Building.

The Food of Kings.

Court Physicians know the best and see that Royal Babies have the best. That is why Glaxo has been used with success in 5 Royal Nurseries. Only the best is good enough for your Baby, for is he not a King to you? Give. him Glaxo, the food that contains everything that will build firm flesh, strong bone and a sound constitution.

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Sole Agents

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CURRENT RADIO TOPICS.

NOTES AND NEWS-LOCAL AND

OTHERWISE.

NEW HIGH-SPEED WIRELESS.

SIGNOR MARCONT'S TRIUMPH.

Sonatore Marconi, in addressing representatives of the. Presa Marconi House yesterday, says the Morning Post of Oct. 21st., an- nounced that the Post Office had approved of the beam service and had taken over the stations, and

that high-speed wireless tele

graphic service between this coun try and Canada would be opened to the public at midnight on the following Sunday at two-thirds the present cable rates.

B-POWER UNITS.

HOW TO GET THE BEST RESULTS.

By J. E. ROBERTS.

The radio shows have disclosed

considerable interest in B hatte y eliminatore."

Evoh A battery eliminators aré' being introduced, and receivers operated directly from the bouzë electric

lighting circuit. But greatest progess so far has been made with the plate or B battery eliminator,

A B eliminator is on apparatus So another epoch passes in the development of wireless communi- that replaces the dry or storage cation, and is yet another triumph batterics used heretofore for plate for Great Britain. It was Mr. voltages, converting the alternat- C. S. Franklin, also of the Marconi ing, 100 volt, 60-cycle current fur Company, who first gave a demornished by electric lighting com- stration of beam wireless before panics to the direct current of the Institution of Electical En-yarying voltages required for gineers in 1922, and this demon-radip receivers.

For good service, only the best stration was repeated by Senatore Marconi in New York the follow-type, should be bought, one made ing year. Since that time the and guaranteed, by a reputable entire resources of the Marconi manufacturer. Company have been concentrated in perfecting the system in order that Great Britain might have the nest wireless telegraphic service in the world.

THE STATIONS.

"The sites occupied for the stations to communicate with Canada are at Bodmin, Cornwal'

VARIABLE TYPE BEST.

This should be designed for con- trol of the detector and intermedi ate voltages. for while we knew that the only change in a dry-cell B battery was down, as it was ge- ing used up, the fluctuations in the eliminator

down. are up and This is because it takes its power from the generator at the power House, which is subjected to and Bridgwater in Somersetshire.

fluctuations of "speak loads" and These sites are also utilised for the valleys" accordings to demands stations to be used for communi-made on the current supply. cation with South Africa, which

Eliminators are economical on are practically complete. Similar receivers of four or more tubes, stations are being built at Tetney. The more tubes, the more economi-, near Grimsby, and at Wint cal it will be, compared with dry horpe, near Skegness, for com batteries. munication with Australia 34 But one cartain kind of curren

India. These stations are almost must be available for B elimina-

completed and are expected to be tors, or they won't work. That is in operation within a few months. 110-vqle 60-cycle alternating cur- thus completing the present Imrént. Before installing an elem perial scheme. "

inator be.. sure this is the current supplied to your home."

OTHER SERVICES.

The standard B eliminator. will The Marconi Company also hottis not work on direct current. Also, a licence from the British Post certain territories are supplied Office to conduct wireless tele-with alternating current, but of gropbic services with certain Con- the 25-eyele variety, and the use linental countries and all other of an eliminator, designed for 60 foreign countries outside Europe cycles on a 25-cycle line is dis- A station at Dorchester is nearly astrous, to say the least. campisted for communication with North and South America, and corresponding station is also progress of contruction in Rio de Janeiro.

NO ITUM WANTED.

With these conditions fulfilled, the next big point to consider is that of a "filter" in the apparatus to eliminate the "hum" of the al- ternating current. It is almost impossible to eliminate all the "hum" of the alternating current, especially with the use of head phones. But B eliminators aren't designed for head-phone reception. They're volume reproducers.

Senatore Marroni, in the court of his address, outlined the diffi- culties that were met in perfectiu the bear system; and described the stringent test of the Post Office "The official Post Office require mente," he said, "laid down that the stations for the Canadian ser

Yet it must be remembered that vice should be capable of com

your receiver has been designed municating at a speed of 500 let for voltages from the dry or stor ters a minute each way, exclusive age batteries known until now. of any repetitions necessary to enThe result of an eliminator's in- twe accuracy, during a daily aver stallation, therefore, may be a nge of o'ghter hours. A demon-squall" from stray currents, or stration fulfilling these conditions choking" of the tubes. was required to be given by actual

Sometimes, the speaker will working to and from Canada for blast, from an excess of B voltage. seven consecutive days.

All these can be corrected by care. This test took place between ful adjustment of the eliminator October 7 and October 14, and the currents to the characteristics of guarantees, which were regarded the receiver

by everyone as being, extremely If the loud speaker "blast," it stringent, have been successfully may be advisable to have a "filter" fulfilled. During these and th installed in the line from the set preliminary tests speeds of 1.25 to the, speaker. This consists of letters a minute over the whole fa resistance of about 25 megohms: circuit have been worked for hours and a fixed condenser of 2 micro- on end. Counting every hour of farads, placed between the plate the seven-day test, the avera and the positive B terminals and speed of signalling has been abous one side of the speaker, while the 600 letters a minute in each direc other terminal of the speaker is ion or 1,200 letters a minute over attached to the negative terminal the complete circuit.

of the A battery."

TRANS-ATLANTIC TELEPHONY. "These result," declared Sont- turo Marconi,have abundantli

HOW RADIO IS SUPPORTED.

New York-Here are five waya justed our faith in this new sya-in which radio is being supported. tem and indicate that the stations David Sarnoff, leading radio manu- will be more than capable of handling all the traffic that is like. ly to be available between England and Canada."

facturer, enumerates them;

1. By the radio industry. 2. By commercial organisations through indirect advertising or the development of good will.

High hopes were entertained by Senatore Marcont of successful 8. By educational institutions. trans-Atlantic telephony by utilis-4. By social service workers ing the beam system.who have found that radio offers Ine principal characteristic of a means of public contact on a the new system, he said, was that scale unapproached by any other the waves carrying the message3 medium..

were transmitted within namall 5. By cities and statea that angleton degrees in any desir spend large sums telling the ed direction, instead of being al-American public about their pro lowed to spread in all directions,gress and possibilities,

મય

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