HONGKONG TELEGRAPH SATURDAY, JUNE 20, 1925. (FEATURE SECTION).
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DUBARRY'S HIGH CLASS PRODUCTS
Characterised by Daintiness and Charm, Bath.. Crystals, Soaps, Perfumes, Poudre, etc., etc. The Hall-mark of Quality. New Stocks constant- ly arriving.
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BEER
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One of the most treasured possessions of friends far away is a photo of their dear ones overseas. The Ming" Yuen Studio is fitted with the most modern photographic 'equipment and will be pleased to show you specimens of
their work.
THE MING YUEN STUDIO
(Battery Path.)
Official Photographers to the "H. K. Telegraph.
TO WORK IN COMFORT DURING THE DAY, AND REST IN COMFORT DURING THE NIGHT.
USE
SKETOCIDE
and quickly rid the Office and Home. of all MOSQUITOES. FLIES. SANDFLIES, Etc., Etc. SKETOCIDE kills all insects.
SKETOCIDE is pleasant in use
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THE
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Radio Notes & News.
Scientists Baffled By Dead Spots..
1924.
What makes blind spots blind Asia, Africa and Australia in fe one of radio's mysteries that koeps on baffling scientists, says an American radio writer.
Blind, or dead, spots" are areas through which certain stations, cannot penetrate.
Australia is the loading market for American radio products.
Japan is second and Now Zon- land third..
Algeria is practically market as yet.
no
120 plate, 6 to 9 C; 150 plato, 9 to 12 0:
Koop baseboards from warping or absorbing moisture by soaking thom in boiling paraffin."
No. 16 or 18 enamelled wiro». makosa good substitute for bus bar for internal wiring.
• *
MORE IN GERMANY, The German, postal ministry plans construction of three now broadcasting stations, one each at Elel, Dortmund and Stettin,
+
COLLEGE REUNIONS. Station WGN, Chicago, bas started a series of college reun ions by radio overy Wednesday Dame. night. The first was that of Notro
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FARMERS' PROGRAMMES.
For example, Baltimore is only 40 miles from Washington, yet South Africa has its own broad- powerful receivers in either alty oasting station and requires have been unable to tune in a licenese for receivors. Mostly broadcasting station in the other British sote in use. city.
Southern end southeastern Asia This is true between Cleveland shows very little, if no, progre and Buffalo. Thero's another in radio. India requires an im- blind spot near Camden, N. Jport permit for radio, equipment. another at San Francisco's Burma has a broacasting station, | Golden Gate. The Santa Barbam Java will reserve broadcasting Special programmes for farmers islands constitute another dead as a government monopoly and are being broadcast every Tros- ares, the bottom of Yosemite Coylon shows a limited market day evening from station WGN. valloy another, and in fact for American products.
| Chicago. Lenturos, debatos, plays practically every locality can Siam has no broadcasting and monologs, all educational, point to some spot nearby which station.
faro chosen för this night. obstructs reception of certain China maintains a virtual pro- broadcasters."
hibition against radio importa- Bureau of Standards engineers tion.
FOR SHORT WAVE SETS. have no satisfactory theory to ex- Japan has practically
South African dealers havo plain this phonemon of dead market for radio imports although wired to America for 500 short spots. There is one ides that now market is about to start wave receivers that will be able the spots are caused by some with the opening of public broad- to tune in on stations like KDKA unknown condition beneath the casting
and WGY, which broadcast re-
no
earth's surface. Another supposi Australian amateurs are help-gularly on short waves. South tion is that some unknown force ing to boost radio through their African face have been hearing, is aonihilating the radio waves communication with Americans. these stations often. in these areas.
But those are more guesses, for which there is no substantiating proof.
What complicates this mystery is the dead spots may apparently
The country is woll supplied with broadcasting stations. Receiving conditione aro good and the mar ket appears to be expanding.
American radio exports to Aus- tralia have increased from $3513
be dead only as relates to two in 1920 to $1.052,707 in 1924. -localitios, say Buffalo and
Cleveland, or "Baltimore and
Washington.
RECEPTION HUM.
Taken Out Of Tubes.
Station WGR in Buffalo cannot New York Tho' hum usually
'MOVIE TEACHES RADIO,
How parts of radio receivers are made has become a regular topic for movie films.. A Holly-
wood firm issues auch - films weekly.
CORNELL ON THE AIR. Cornell University, at Ithaca,
be heard in Cleveland, so it is heard in reception and attributed NY, has taken the air through deduced that there is a dead spot to a peculiar radio tube character-station WGY at Schenectady. Its between Cleveland and Buffalo istic, is said to be eliminated from course will be on home economics, But station, WSAI or WLW at Cincinnati may be heard quite new type of tube developed by and it will be given on Mondays
Herbert E. Metcalf professor atj and Thursdays at 2. plainly at Toronto, for instance; although the waves would have the University of North Dakota to penetrate this "dead area" in and now engineer for a radio transmission.
company.
RELICS OF H.M.S. DEFENCE. "The noises in a tube are pri According to S. Kruse,
Relics of H.M.8, Defence: technical engine or for the Ameri-marily due to vibration of the
filament in relation to the grid," which was wrecked on the coast can Radio Relay Leaguo, “a place
says Metcalf, "This has lod to of Jutland in 1811, have recently. that is dead to transmission from the development of a tube which bean washed up by the sea, in one station may be perfectly good, or unusually good, for tran- smission from another'station."
A change in wavelength may even overcome the obstruction of a dead spot.
is non-microphonio, or quiet, excluding a number of boot sales of copt when a radio signal anters the pattern used in the British
Army at the receiving sok"
the time
of Napoleon. The Defence was driven ashore, and of, bor craw of 6'0
- SHORT CUTS..
"A point that is dead for trans- Things to Know in a Receiver, men only four were saved. In 1869 the wreck was first uncover- mission from, a given point at To stabilize a radio-frequency ad by the waves and divers suc one wavelength," Kruse explains, set, hook a midget variable con- oeoded in recovering a good, deal will be perfectly normal, or denser between the plate of the of property." There is still, how- better than normal, for transmis first tube and the rotor of the an over, a large sum in gold missing. sion from that same place at tenna-tuning condenser. Some- and an expedition is being fitted. another wayength."
times this also will increase out to recover this. South of To take a map of the country's volume and add to selectivity, the scene of this wreck, off the dead spots, therefore Kruse adds, especially in loop, antenna Texel, is the wreck of the Lutine, "ond would need one map for receivers.
whose bell is kept at Lloyd's and each wavelength and each trans- If you want to use 199 tubes used to sound the knell, of miss- mitting station. This would with a G-volt 120-ampero-hour Aling ships: The Lutine, too, bad mean hundreds of maps, each of battory try putting a 50 ohm much treasure aboard which has which would represent hundreds rheostat in the negative lead to never been recovered: of observations."
cut down the voltage. Thon include the usual rheostats on the side of the lead opposite tho battery connection...
U.S. RADIO EXPORTS.
Triple Increase Shown. Washington: Tuning in on radio. Ordinarily battery voltages conditions in the arient, the U.S. vary according to the amount of Department of Commerce finds: plate voltage used in amplifiers,
An increase of more than 300 as follows: 40 volts on plate, per cent. in exporta of radio sets to 1 volt C-battery: 60 on plate, and parts from this country to 1 to 3 0; 80 plate, 3 to 4 Oil
*(
J.
T. SHAW
LADIES & GENTLEMEN'S TAILOR
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