The Famous GARNER
19
THE HONGKONG TELEGRAPH,
British-built
truck-chassis and passenger-bus.
Two of the famous British-built "GARNER " 2-ton truck-chassis, equipped with pneumatic tyres have arrived and are now on show in our Kowloon Branch Office, No. 1, Canton Road.
One 24-passenger British-built Bus, English pattern, complete with body and equipped with pneumatic tyres, also of the famous Manufacturer GARNER" has also arrived by the S.S. "Glensheil".
66
Inspection is cordially invited.
SOLE AGENTS:
HONGKONG & KOWLOON TAXICAB CO., LTD.
26, Queen's Road Central, Telephone No. 1036.
Chesterfield
CIGARETTES
When you smoke a Chester, field, you smoke the finest aro- matic Turkish blended with the best American tobaccos.
They Satisfy-millionst
IGARETTES
LIGGETE & MYERS TOBACCO CA
LIGGETT & MYERS TOBACCO Co.
radio fans.
WEDNESDAY, JULY 23, 1924
RADIO NOTES AND NEWS.
Two Tubes Made to Work Like, Four.
A two-tube push-pull amplifier] form a rectangle. The windings that equals thruo and oven-four-aro-put-over-the-joints. Thoy tubes of an ordinary amplifier has are the primarios and secondarios boon designed for the bonolit of of two low-ratio audio trans formors. The primarios sro than It is one of the many ways by connected together In series, which radio onginoora havo been with the twe outside socondarlos trying to obtain clarityand volume brought out, and a tap brought in amplification to free radio of out where the two insido con- its bugaboo of distortion whenever noctions of the secondaries are moro than two stages of audio- connocted. amplification are attempted.
In the circuit duscribed here one of the variotion of push-pull amplification-two tubes and two middle tapped push-pull trane, formers give amplification aquai practically to three stages ofù transformez-coupled amplifier... The idea of the push-pull am- plifier is this:
Two audio-frequency trans- formers, with a tap in the exact middle of each of their socondary windings are connected so that the two outside of one secondary nonnects to the grid of each tube, while the outside ends of the other secondary are joined to the plate of euch tube.
Thus, a positive and nogative feedback system, is establinked between the tubes, resulting in greater efficiency from both While one tube has positivo food- back and tonds to howl, the other has hogative feedback and absorbs and prevents howling.
The parte to this amplifier aro: Two push-pull amplifiers, TI
and T2.
Two tubex. utt sockets. UV201-A.
By revorsing the "secondary leads, the amplifier may be tested for hast reults.
ITEMS.
Money In Rudio.
Just unpacked
a consignment of the latest
Summer Frocks
The Grasa income of the Itadio Corporation of America rose from $4,000,000 in 1921 to more than Les $26,000,000 in 1923. During 1923, ; it is ostimated, the radio business went above the $250,000,000 mark | in tatal sales. Conservative esti mates for 1924 put the total sales figure at $400,000,000. And this is only an infant industry,
MOSTLY CRYSTAL SETS. Sixty-five por cent of the receivers in England are crystal eots, reports the British Broad- casting Company. Of the rost, 7 por cont. have one tubo, 12 por cont, two tubes and only 2 por) cont. three tubes,
MIDDIES MUST QUALIFY, Midshipmen of the U. S.-Naval Acadomy at Annapolis have to tako up radio and pass a thorough oxamination before graduation. Ono of the requirements is to build a workable recolvor,
GERMAN MAKES.
One rheostat, 6 ohms. Wire for connections. The B battery of the receiving The oight firms that have been set should be stopped up to 120 formed for broadcasting in Italy volts and a C battery of about 6 have turned in German radio volts should be connected between manufacturers for their supplice, the primary of the secondThis came about after Americans transformior and the negative of failed to land contracts thore and the A battery and filaments.
the British could not become in- Sinen connections are easy, interested in that held.
this amplifier, and there ard fow parts, thoro has been no attempt to describe any arrangement of the parts.
NOISES IN YOUR RECEIVER.
A mechanically inclined fan Loose connections or badly may try building his own soldered joints are the greatest transformers, although middlo. causes of the exasperating noivos tapped audio-frequency transfor-you got in your phones.
PHONE
TERMALS
A Datt
B1201
AND
Hats
From Paris
at moderate prices. Inspection cordially invited. Elegances de Paris;
No.. 8, Queen's Road Contral.
00000000
THE FOOD OF KINGS FOR YOUR BABY.
Kings and Rulers command the best the World can give, and Royal children have the best medical advice, the best nurses, the-best food obtainable.
Glaxo is privileged to display the Royal Arms of Italy and Spain because the infant sous of the Kings of Italy and Spain were brought up on Glaxo,
Your Baby is a king to you, and demands" as his Royal right the best that you wan give him. Glaxo-the fond of Kings-is. therefore the food King Baby must have, so that he may grow up a pride to his Mother's heart.
Glaxo
BUILDS BONNIE babies.
HOOKUP DIAGRAM OF THE PUSIC-PULL AMPLIFIER
nors for push-pull amplification If there is any corrosion in the are on sale. The transformers joints, & scratchy, noise results. should be of the low ratio variety,]
4 to 1 being about the bust.
Loose binding posts cause the same noiso. Loose phone con- į A good one may be made ba as- nections are another annoyance. ! sembling two transformer wind- The romady lies in tightening ings on One curd. The core all binding posts and rosoldering consists of two U-shaped piocos¦ all loose joints with the use of as of soft Iron, butted together, to little flux as possible.
A SECRET.
RADIO CAN NOW KEEP
E. HING & CO.
SHIPBUILDING MATERIALS, SHIP CHANDLERS &
HARDWARE MERCHANTS.
PHONE CENTRAL No. 1116. 25, WING WOO ST.
THE HUMAN ZOO
Central.
By Dj Dalolator!
Synoleo
Colourwash
The Finest Interior Wall Decoration
-STOCKED-IN-ART-SHADES
SANITARY.
ARTISTIC.
DURABLE.
From all Shipchandlers
the Manufacturera
Wilkinson, Heywood & Clark
Alexandra Buildings.
WIRELESS ON SLEDGE,
Music Heard by Merton Expedition.
flow wiroloNN holpod tho Morton Collogo Arctic Expedi- tion (1923) to Spitzbergen and North East Land was told by Mr. R.A. Frazer to the Royal Geographical Socioty racontly,
The throa valve receiver carried by the sledge party, he said, was doubtloss an innovation. In Spitzborgen it proved invaluablo, | by kaoping the party informed of the outlying weather conditions and of the movements of their sloop.
Tho sloop carried & four valve receiver, and the high power European stations wore ousily rocoivod.
of
The time signals enabled the party to check their chronomotora: daily, and the advantages of this from the point of vłow astronomical observations, was incaloulable. Music and spooch from the Nowcastle broadcasting station wore clearly heard.
RADIO GIRDLE FOR SHIPS, Radio direotion finders are bo. Ing placed around the British Isles so that abips near any part of those shoren will be able to get their boarings with caso,
John Haya Hammond, Jr., photographed in Rome, whore he has entered into contract with the Italian government for the purchase of a radio dovica which permits secrecy, in transmission and permits more than one massage logbe sent almultaneously on the same wave length." Demonstrations in Italy brought to light that the device makes posible narrowcasting," the opposite of broadcasting, and, long the dream of radio: fans. Young- Hammond is the son of the famed willer, educator, financier and diplomat, John Hays Hammond,
Thirty-eight seconds later, two brokers, an architect, sovon salesmen and fiftoon office boye were injured in si övororowded elevator,