LOTOL
KILLS NOXIOUS INSECTS
and DISEASE GERMS.
FLIES BRING TYPHOID, and DYSENTERY.
MOSQUITOES convey MALARIATM
COCKROAHES
cause
CANCER
GO THROUGH THE HOUSE
SPRAY
THOROUGHLY.
LOTOL
FREELY.
THE HONGKONG TELEGRAPH.
WEDNESDAY, MAY 13, 1925.
Radio Notes & News.
Reception Spoiled By Minor Faults.
However woll one looks after
A transmisin of music was radiated from Chelmsford, and re-broadcast by W.J.Z. and W.G. Y. in Amerion,
Those stations wore, in turn, received in England, and also in Vienne and Barcelona, so that he London broadcasting wis received back again in London, also on the Continent. A an accumulator there comos a edgewise into a hundred abeats- Barcelona saying how excellent. If you could split this shoot telegram was roceived from time whon a misdemeanour on then take one of those sheets and fly the London programme was the part of the receiver oan be splid it edgewise into another hun-being received, traood to a faulty accumulator, dred shoots and then take one saya a wireless expert writing in a London paper.
I had an instance of this the other day when I was asked to look ovor a friend's set which had been behaving unsatisfactorily for soine days.
It was quite a straightforward set-one datestor valve and two low-frequency valves, with reno- tion on the aerial.
Directly the set was switched on the valves lit up O.E., and signals were received at normal strength on the loudspeaker-bul accompanied by a moat unplea sand grinding, crackling noise.
At first I diagnosed the trouble asone of two things atmospherics of a faulty H.T. battery.
of those and split it into another ON THE BANKS OF JO-YEH. shoots would have a thickness of hundred sheets, one of the final about 1-100,000,000th of an inch!
of the space" through which the That would be, the "thickness, diaphragm of the averago phone vibrates when you hear a wire less signal..
It has been found, too, that the human ear can detect a vibratory motion of about ono-millionth of one-millionth of an inch.
but
The telephone is wonderful; the human oar is more wonderful still.
SPAIN HEARS LONDON VIA
AMERICA.
"Boomerang" Broadcasting from
Chelmstord.
The accumulator seemed to be functioning quite normally, and at firet I did not suspect it.
Experiments in Transatlantic Switching out the aerial and broadcasting carried out recently earth did not in any way re- from Cholmsford high-power duce the noise. That eliminatod station are described in a state- atmosphorice as a possible cause; mont issued by Marconi's Wire- and a "oaroful tost of the H. T.less Tolegraph Company.
After the Chinese Li Tai-Po.] On the River, Jo-You the girls
water lilies are pulling What funding and fooling!. The sun makes a glass of the
water to show their bright, dresses,
Which the light windcaresser. And from their wide-billowing
sleeves and soft silkon raimont
Takes parfume for payment, But who are those gay cavallors
on the river-bank riding, Whom the willows are hiding? As they pass 'death the boughs, of a sudden a horse's shrill neighing
Their presence betraying, A girl's lilios fall in the water.
Ab, love's vision flesting! How her young heart is
beating!
IC in the London
Morning Post.
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"ROW RECEPTION
Besides giving a good idea of shows the original studio, whore what the inside of a broadcasting power up to 1000 watts could be station looks like, the plan shown generated. bera tells what it means to raise
+
make the additions shown above. Bosides enlarging the panel room and adding a larger broadcasting studio and offices, Anthony has provided for an open air dancing pavilion outside the studio, on the roof of his building, 80 .For this purpose Earle C. An-visitors may dance to the musia most stations. The dotted portion thony, owner of KFI, had to being played in the studio.
With the new arrangement, a station from. 500 watts power stations are permitted to expari
to twice or three times that input.ment, on 1500 watts, and up to
This happens to be station KFI, 5000 watts: at Los Angoles. but it's typical of
C. P. Goerzy
battery revealed no fault in that direction.
One or both of the L. F. trans- formers might have been respon- sible for the trouble, but they
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were all the contacts, etc., etc., and I began to feel rather foolish at not having started at the 'right, place by examining the L. T. circuit first.
I disconnected the accumulator, put another one in its place, the noisos ceased immediately, and reception became perfect.
The trouble in the old accumu- lator was this: my friend bad lost one of the ventilator caps- from the top of the battery, and
a small amount of dirt or some-
thing had fallen into the cell and was causing a semi-abort between. wo plates. A close ex miration of the cell showed obvious sigur of sulphating, and of one of tho plat a starting to buckl..
lt cost.6. 9d, to repair thet accumulator-all because of a lost ventilator cap and careless- nese in not preventing dirt from | falling into the cell.
WONDERS OF HEADPHONES, Hundred-Millionth Movement.
Hundreds of thousands of peop-- le are now in the habit of clamp- ing a pair of telephones over their eira and listening to broadcast wireless concerts, but how many of them realiso the marvels which are invested in a pair of "phones? aske a writer in an exchange.!
If you look at the diaphragm of your phones you will fa l to notice say movement.
This is partly bodzso tho diaphragm vibrates so quickly and partly because the amplitude, or extent, of tho vibrations is of an extremely low order.
When you hear musio in the telephones the diaphragm is moving with great rapidity, but, it moves to and fro through a distance of considerably less than one hundred millionth of an inch. It is hard to appreciate such a amall distinco, but the following may give readers some-ided of its minuteness.
Suppose you have a shoot of papor of such a thickness that it lakus 100 shoots to make up onò inch.
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