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1
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ENGINEERING: Continued
THE CHINA MAIL, THURSDAY, JULY 3, 1947,
Some Future Trends In Radio Communication
chn be
Cuzes
Up to 1959, there were only," are resolved. A good deal of data, was the intrinile reliability of the "Yew, though quote jimportant, in I now available from which the wavelengths below 10 m., which
mnde successful radio-relay syk tance of the was of frequencies cquipment required to give
possible. On the lower bboye 30 meragyelés per second. service as good ps the line tele-tems
forecast frequencies there were many It was apparent," however, that phone service
The sun, however, apparently
where intermediate radio These frequennas võild be used to
mbstantially Inter. Atill controls the transinitting me. repeater stations were used, in- provide.
uf u fcrence Tree sa vite
high | dum at the longer metre wave- cluding an airborne repeater in Atunder the arcophones in tight lengths, rain, affects the outlookatteust one outstanding Instance. Wave bands, at they provesi of great value in on centimetre wavelengths, and On the Continental
the chain of No: 10 sets proved the Battle of Photon. The Army Nature has its own radio counter
measures in the selective oxygen: to be the only way of establishing Tál: 6 se ved vlagar freprenejes at an
qually reliable communication in early due to short distance com- absorption.
Wac sianplu A: regards equipment, the newly renvered countries. In the Thymeseesves between searchlight | smalt magnetron and the dise seal Beld of navigation aids, the de-
mini.optient towing to 12
“Munbekan
201
Half Mene propogatiun, opera, Compl EX-14! thansa Freqtiracies
Hej!
kometer until later
By Sir Clifford Paterson
į
te
FLAME SPRAYING
New Battle
Page-Q
Battle Against Corrosion
Against For every man's office.....
The recent war had been a
It was a good many years ago: that Sir Robert Hadfeld' cal- culated that corrosion Costa England £28,000,000 a year. at the separate audio frequencies. period in which the attention of The problem is to maintain cach Reparate pulse wave form within the designers and metallurginis the Borrow time interval assign has been focused more than ever ed to B. The appearance of multi.before on questions of protection path radio signals will give rise from corrosion, especially under to echo effects and cross-talk, and tropical condillens and in marine
As the the best operational system will atmosphere.
result of these ex- perimenta, and experience, be that in which the behaviour of these echoes is most effectively cars. Schufi Metallizing Pro- controlled
B.B.C. Project The project of the British Broadcasting Corporation to de. velop very bigh-frequency modu. lation broadcasting has the warm support of Industry in that it should make available more clear
the fre.ge system
the
to protect walls of electric.] “furantes, foundry ladles aud fire bars against extreme hent.
to protect cylinders of air- cooled engines against cor rosion and hent,
Swides Iron Spraying
to save eastings from the gerap heap. Steel Spraying
J
.
to bild up worn-out shafta, Tin Spraying to make food
-containers safe.
Lead Alloy Spraying -- to ren
der chemical plants neid resisting.
to water-
cess Ltd., of Landon, have im- Proved on the pre-war, methods of metal spraying and developed Sulphur Spraying --- Д
now
technique
-
flame
spraying of powdered metals and plastica.
10
proof and paint ennerule Bronze Spraying to build up bearings, and for decorative finishca
Thioco) Spraying
The basic principle of Schort
to protect channels, for high-quality brand-Pistols consists of sucking from
steri against chemiew casting. In television, the wise a container, by means of an air ih Uwe wan The work on centi.
of powdered fumex.
-- to make Tinelis and decurte waerlengths type of receiving triode mnde the velopment of ray.selection technf-decision has been made that the current, a supply
405-line system shall be re-esta- material which in induced by the Shellac Spraying
decorative directed on to the instry No. 10 set possible. On the other; quc, the simplification in presen.
Wehr - By The Adunnity, wed
reydsting mizu, bet ultimately to the No. 19 | hand, the production of 100 mil. ¦ Louvr and operation, and the blished. This gives a chance to pistol and
finishes. The higher Requep wer valves between 1939 and 1945 plentialities of the wide aperture industry to design economic re-surface being sprayed through
LEST annuler Hame if com- Polythene & Platies th finish electrical components anch therefore, prisena, bank found their·
and acetylene gabled communication to be car system were of interest, The iuwa ceivers. Mony, however, will de.
mand more longible progress, and bunted oxygen mate tent application in i way
for Flee uut on hitler to divanuit of Nature and the lonosphere, in
an influite variety of the first reasonable step is to do (or, what is even better, pro- 1150 the that beauty mates, the lines of
of netle, Beskles aid me in a particular, govern
other purposeys.. future joogte
calisation," the chemist assisted which such aids can be put and sign and install a long-range link. pane).
1
which will enable The Schorl can spray
The Schori Prucess is appírov. High Frequency
the with new insulation runteruals, so their particulur place
broadcasting to be carried out on immense variety of materials, ed by
Admiralty, War Both fequetry and pulse fine that an outstanding advance was quency spectrum. Perhaps
the fact that Office, Crown Agents, etc., atu) 10 lyde Mentalatom and conerit greatly durende in the development of the nest interesting new technique in national basis, programmes to limited only by
Trwy las plastic cable. A lot more continuous waves is that for the be collected from the widest area, they must be fusible, or at least is also acceptable the war. The use of the Tarmo wa Itraferk, Bowever, for, via discovered about quartz éry, determination of pusition by the and the cast of receivers to be "ainterable", thus permitting ony Register of Shipping and to the Departmen carrier wave; in reduced. As far as domestic tele kind of metals, plastics, shellac, Mercantile Marine By the bone at advantage in Uite, st. is, and they can now be made phase of the very buth Company bedd brenne by muss peluction methods to ore will be heard of systems that vision is concerned, there is a sulphur, etc., to be permanently, of the Board of Trade.
real need for larger pictures, even bonded to the surface under Among the many fjel wal Nothing Faces give a better variety of reprontue, employed the time as opposed to
Schorl peena we may mention. Vickers Armstrong Ltd, Dorman were far derge's momafted to amate and permanent charac.cisco. the amplitude variable. The sup. at some increase of cost. It is treatment.
which were unlikely that a solution will, ap. Pirteble putukaturut erpipient." Aerial design hos progressed in pression techniques,
Long & Co. Ltd, J. H. Tuelgr Never Linder, myve, fug finns show complexity, the greatest vanres developed constitute a major con.; pear without the use of a picture
signal of appreciably higher de
Zine spraying has been shown, & Co, Ltd.. Whitebead Torpedo ed the lacentage of ach systrius,, having naturally occurred at the tribution to the successful com paturity Crea of high signal shortest wavelengths. On the one; musiration of the armed Forces. finition. The standard for higher during the war years, to have Co, L., Mechans Ltd., Scostoun
definition is commonly assessed of many advantages over other Iron Works. interference Our Ladan, and as early as 1940 baud, the ability to design aerials The
between 800 and 1,000 lines, and forms zinc coating. The "The EngineeringTM Department in of given team-widths with the trum internal combustion engines most of our techniques are ready sprayed oating can
be easily of Yu “Tuy Trả Limited, se in pie wan centimetre work einimum of side Jabes atulom to particularly noteworthy.
for such development. At least, made thicker than electro- Licences of Schurl Process for interrupter at the other, the conception of the
war-time experience has made us deposited coating, or coating China, have recently received audio Freqarisey with real "on" slot vria) for aircraft shows how
tamiliar with much wider band produced by hot dipping. With from England a number 4) nmd ad perks, and might be well the problem is understood,
*widths, high radio powers at very
a thick conting the galvante pistols and powders, and plat romised in tures breg the fore-
he those who will stress the need short wavelengths, and high gain couple zinc/iran protects the soon to make demonstrations of moter, of the gaboo terhnique.
for greater reliability of equip aerial systems for broadcasting iron at its baar, zine corrosion this most interesting and useful During the war, muitas apparatus
meit, even flint means limita and for point-to-point linkage, product fills the pores entirely, process, wen- develigned, working on abon
tions in operation. There will also The fascinating problems of a thus creating a rust-resisting 9 n. and the concept of time
"the varia www
Hers Weds
qi thurint the way and it will have a marked influence un future
corramunication betworks.
Major Step
· Easier Tuning erationally, ane line of the velopment was the simpliftention of uming. I was renlised even fore the war that, in many enses,
abatement cof
Reliability
Turning to the future of mil tary communications, there will
Thick Coating
be those who will stress simplifi-colour system are slowly yielding armor which, incidently, afforda
Radiation
with
Open Switch Cause Of Smash
Westville, June 30, Seven passenger cars of the
train
mrbulatio was introdusert. The
it was essential. to arrive at aention of operation Ro us to rein treatment, but there still seems an ideal key and basis for Parver wig intetrupled at super
predetermined received or trans third to
minimum the training to be a wide gap between scien- application of paint, which la Bathin
the time ting frequency
For the main fe achievement and commercial far from the case Stquery atte
a slengde' periods involved. by duration of the "on" periods was
Aperation that could be exented communication links, there is
possibilities.
vanized coating, Vand In beenfance with the oven in the dark. The No. 19 class ease, for an undecipherable trans.
Aluminium spraying has afadios e agunk, Tin thể possibility of set was designed on this basis, mission system. All these claims The extension of electrification found particularly large applica of a telephony + centimeter.beam The click dials cuntrolled a free will have to be met. In civil avin- transmitter appested. 15 gola oscillator, which could be set ta
tion, the relative advantages of demands elther measures for re- tion in the aircraft industry for interling a new principle, it jaanyað presšłałe la interlace eight my tinig point in the band and the various aids to the pilot are ducing the spurious radiation from such duties as protecting the
a net of any number of seis pre. gradually being sorted out, and electrical equipment by providing ths of aircraft cylinders against Baltimore anil Ohto sepatute sproveli messages in time tuned
and conting the Columbian," to the same sel of fre. It seems that, in due time, it will high-power transmitters to over-extreme heat
en route from alal to provide a multiples mesquencies. When the Ruyal
Air be possible le navigate at least come such radiation or that no linings of hot water tanka, Chicago to Washington, derail
petrol tanks, otc. sage. The was unkoubtedly one Force adopted very high frequency the main short or long-distance spurious radiation shall occur. A
ed near here tonight when the of the injor ateraces in techni
Probably the greatest advan traia hit an apparently defec working they soon employed pry, routes by cadlo nida alone, and compromise therefore appears es- stal control. This gave them ue. often with the radio aid contral-sential. Mobile equipment cannot
Alter-tage possessed by the apray gun tive switch. curate frequency selection by the ing the automatic pilot. In land. have unlimited power.
The police reported at least turn of a switch. The number utjing and low flying, continuous natively, when high-power fixed is the fact that it is able to
flame-spray a wide variety of 60 persons injured. possible frequencies was, however, wave and rudar aids will both be stations modulate the ionlsed lay.
non-metallica, such as Thiokol, The police said the vibration limited to four, or later eight, and Involved. Even in clear weather, ers, mutual interference between Folumerized Shellac, Coloured of the train, speeding across the In the telt ef propagation major strị forward was provid- they had to have the correct cry- over an open sea, the radio aill. signals occurs. The exact balance
Polythene, Sulphur, various country at 78 miles per hour, stals at the right place at the meter may be one ise the radio operate with
of, the most is one of economies, but there are
cases where safety of life is in-kinds of plastics and synthetle was believed to have thrown To overcome these vital items of equipment, but in series of chatte which save him right time.
helps the Such services should be rubber,
open a switch, throwing the the options high frequency he disadvantages, a few built.In per-conditions of poor visibility also volved.
provided it is beginning to become possible allowed special consideration. In-manufacturers to solve many of train off the tracks. should in terms of the loca.
crystals were
their knotty problems.
No one was reported killed tion of the, fromanitting and re for frequency control; and a large to visualise the time when a pas-terference from car Ignition sys.
Many Uses
but the police said at feast 40 qeiving stations and the time of number of channels was ablain singer.carrying alreraft will be tems may be expected to receive
Following is a very abridged of the injured were stretcher. day and serpens. The story is saided by utilising the energy at one lunded purely by radio aids. There early attention, since television is
the ur other of the crystal harmonies was, however, the vital and difparticularly affected, and means of list of uses of the application of cases, some of which were in ill to be incomplete, but
critical condition. iymetical compromise schemes so directly, or, in the more complex ficult problem of giving such a preventing it have been shown to flame-spraying:
ta make Spraying
The train roared through the service with never a chance of be simple and practical. by using the har. for evolved Dot as if they would equipments,
failure. Civ mobile, communica. The bearing of all this on ex. structural steel permanently deserted Alida, Indiann, cross- siind us in good stad until the monie-output to control the fre
corrosion-free. last mysteries of the foriosphere' quency of a free pscillator. Itton is a new class of service the port trade must not be overlook.. seupe of which has yet to be ex. ed. We are in. a better position plored. Quick information from than before the wor to supply and to a fishing fleet, the ability equipment engineered to the re- La redirect road transport, the as-quirements of any specific locality, sistance that can be given in a Moreover, Industry is well equip
in its labora. railway marshalling yard or to a pèd to reproduce breakdown gang, all have a finan- torles the conditions that have to cial value. Such possibilities are be met overseas and hence to en- largely due to the development sure a very high standard' of re of techniques in the metre and liability. centimetre wavelengths.
manent
THE MOST EFFICIENT AND
-Up-to-Date Automatic Duplicator
in
Trunk Telephone As far as communications general are concorned, there can be little doubt that the efficient And economic
operation of the trunk telephone system is made possible by the use of the twelve charinel and co-axial cable multi. channel systems, the latter being capable of 'accommodating 000 channels on une tube. The high cost and comparative infexibility of a buried cable system would appear to be entirely justified as the primary trunk connection be
R
Self
RONEO
#5 0 0" DUPLICATOR
Inking
Feedlag
Counting
Slacking
Full
Detalls
From DODWELL & -CO., LTD.
7A Alexandra
Building
Tol. 20038
HOW DEMOCRACY.
MUST GO INTO
ACTION
(Continued from Page ()
In Turkey the Kemalist re- 'orms remain in force. people ook and act like western Euro- aans. There is an opposition press.
But over half of the national
man-
tween densely populated areas. In budget and a large fraction of the secondary extension of such Turkey's badly needed a network, geographica! difficul-power, go to support the army. tles, such as wide river estuaries, And the Army is used to main- are, however, likely to erlsa, sudtain the state not just to repel a radio-linkage system then has aggression, attractions. If a rad system is Japan la agreat experiment to function as an extension of an in the reform of a nation and existing cable system, it is usually people. The atmosphere is ono uccessory that it should be cap of eager cooperation. Yet it is uble of handling multi-channel far too early to tell whether the carrier signals an presented by changes are taking root; a the cable. So far, frequency mo General Douglas MacArthur's dulation has been found satis remark to us that the control | factory for requirements up to 12 and tutelage should continue or 24 channels. The main problem for at least a generation scenta in such cases is to approach linear a necessary safeguații, modulation and demodulation, so
Our flight also emphasised the
that cross-talk 'between channels
can be avoided. There are marly narrowing lines of global in- torest. It ́should be one world places where a number of trunk channels can be collected together and yet it is not. Great com et audio frequencies, and it seems petitive forces are at
kely that a pulse-time modula Communism which thrives on tion technique will be very suit chaos is a porausaive world in- able for such requirements. The uence to which an adequate re
work.
audio signals are easily translated play is not yet being made.
into suitable pulses, which are That reply depends upon Ame given their separate time alloca rica's success in making demo-
tions, while at the receiver thecracy tangible, practical: in- BC- time-sorting of the mixed pulses tion more than in precept,===| naturally gives rise to an output / Associated Press,
Zinc
which
•
and every woman's home!
Two way "Tallin
TWO-WAY TALKIE'
by DICTOGRAPH
PROVIDES EFFORTLESS
COMMUNICATION.
two way O Talkie
E.
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FRENCH BANK BUILDING
VOYCALL Complete Intercommunicating
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A study of the accompanying sketch will enable you to see how convenient such an ingfala- tion would be,
To busy men who would find it hard to sull each other's con- venterice by personal Interview a VOYCALL INTERCOM veritable boon,
sty
0
Address enquiries to
ing. Three hundred yards be- MANNERS ENGINEERING LTD. auper-yond the crossing, seven of its really nine cars buckled and left the
tracks.
to make hulia and
structures of shipa rust-resistant. to. obviate chipping and painting of shipwork. to protect gua holder tanka and oil tanks from salt alr. Aluminium Spraying
Corporal Robert Scott of the Indiana State Police said that "60 or 70 persons" were removed In ambuinnees to the hospital- United Prous.
THE SCHORI
Mercantile Bank Bullding,
7 Queen's Road Central,; HONGKONG. Telephone No. 24652..
POWDER PROCESS
Ronds Metal
and Plastics to
The bonding of the zine surface to the hulls of these
·Boats destined for patrol work‘in the Far East are being sprayed with zinc finish by the Schori metal.powder process. boats not only provides them with the most effective protection againsí corrosion but also affords a perfect matt surface for painting. The case and speed with which Schori metal finishes are applied enables shipbuilders to give their craft the perfect protection sprayed zinc, with the facility and speed of paint spraying. And because a Schori finish is firmly bonded, it will not crack or chip, no matter how?
roughly it is treated. Plates can be sprayed before fabrication or
after Assembly.
LICENCEES
HEIKELISING PROCESSED.
Schori
Approved by the Admiralty,
War Office, Crown Agents,
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HONG KONG AND CHINA
YU TUNG TAI LTD.
ENGINEERING 'DEPT.
STOCKS OF PISTOLS AND, POWDERS ARE AVAILABLE NOW"