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OFFICE EQUIPMENT DEPARTMENT
THE CHINA MAIL, THURSDAY, SEPTEMBER 29, 1945"
ايديا
ENGINEERING PAGE
Liverpool Harbour Radar
Weapon
NON-FERROUS METALS
COPPER TUBES FOR DOMESTIC SER-
VICE
COPPER TUEES FOR SUGAR RE-
FINERIES
COPPER TUBES, STRIP, SHEET & WIRS BRASS TUBES, STRIP, SHEET, BARS
WIRE
ALUMINIUM & ALUMINIUM ALLOY
SHEET, PLAIN & CORRUGATED CONDENSER TUBES
NON-FERROUS EXTRUDED SECTIONS-
&
OTHER NON-FERROUS MILL PRODUCTS:
Of War
Against Rust
By MICHAEL GRANT
The fight against rust, the worst enemy of steel construction, has gone en since the first steel com struction was erected. A highly eficient weapon to carry on this nght has been devised in Britain where Metallisation Ltd, of Dud- ley. Worcestershire, England, have constructed an automatic plant for spraying a pratcetive aluminium coating on the faces of certain steel work.
SAT-
The plant consists of a clean- ing and a spraying machine which can be placed in a con- tinuous line so that handling of the section can be reduced to: minimum
Aluminium or zinc coating, to be sprayed on steel surfaces, car only
F perform their protective task satisfactorily, if the surface to be protected is previously complete- ly cleaned of all imparities. This
job is done in the automatic i plant by the cleaning machine in which metal grit made by crush- ing granulated cast steel or tram, is thrown by four wheels
at a speed of 2,500 re- volving volutions per minute on to the surfaces to be cleaned.
re
The dust produced during the operation is removed by cyclone extractors. The sections to be cleaned are propèlled through the
Aerial and aerial base on factory reef, in Liverpool area. Used by the 'Liverpool Harbour Board' Radar. Photo by Sperry Gyroscope Co. Ltd.
Proud British Record
In Television Field
By SIR EDWARD V. APPLETON
machine by motor-driven rollers Britain has a proud record as a pioneer in the at a speed of four feet per minute
̈science and art of rediocommunication.
The steel sections are theThe early practical development of radio itself took passed to the metal spraying plant in which a continuous Jet of molten aluminium or zinc is hurled with great force from 28 nozzles on to the passing sections.
In Spoofs
The aluminium or zine wire, an eighth of an mich in diameter, is fed into each nozzle by an elec- tric-motor drive. The wire is stored in spools on a platform above the machine, is fed down to cach nozzle through copper Luking, melted by the burning coal gas end sprayed on to the clean surfaces
per
minute. The nozzles
ploce as a result of collaboration between Mar- coni and the British Post Office, culminating in the installation of the first long-distance radio link between this country and its oldest colony, Newfoundland.
tically the whole country, but, with the increased use of short waves for varices communication purposes, the problem of obtain ing a 'sufficient number of suit eble frequency channels to pro vide & service orer a densely populated country such as Great Britain is likely to be dificult The problem would obviously intensified if we had to fit in the inuch large frequency bands which, as we have seen, are de- manded by an increase in
im thr under of lines.
be
Other scamtries, of course, may
Manufacturers:
ICI
Imperial Chemical Industries Limited
Metals Division
Witton
Agenta:
England
Imperial Chemical Industries (Ching) Ltd.
Erince's Elde
Tel. 26658.
Chate Road
ALL AROUND THE WORLD
you'll find
SLOAN FLUSH VALVES
THERE ARE MORE SLOAN FLUSH VALVES SOLD THAN ALL OTHER. MAKES COMBINED.
Again, in the years of sound get the best possible picture broadcasting, the first world-wide densition from such a system a
There is again the necessity of system war the BBC's Empire received bandwidth of the order Service, while a few years later 4 meicycles per second is distributing programmes over the we had, at home, the first high-
but, in
country from a central studio or practice, a com-
froin outside broadcasts, by definition public television ser-
of 27
megacycles per means -of coaxial cables of vice which operated from 1936 Recond is found acceptable.
wireless relay stations. til the outbreak of war.
There seems to have grown up
Suitablé cables are expensive During the war, research on in some quarters television had
the eeraneous in to
idea that
the any case, but the cost of cables cease
the quality of The sections are pulled through in Great
picture depends
ay with the frequency band neces- and many of
almost entirely
sary to do the workers who had made us upon the number of lines. but able increase in the line density, the spraying machine on their
justice to a consider
roller conveyor by a chain at à
pre-eminent
the television in fact this is only half the story would today be prohibitive. speed of approximately 10 feet feld turned their attention to An increase in
in the number of radar, which from the Battle of lines doos, it is true, increase the are radar, distributed in groups of
from Britain onwards played such an vertical definition, but in srder
horizontal they can spray the sections the ene
trinition, the band to surt with a higher line den- ANDERSEN, MEYER & COMPANY, LTD., There sides. Eolled-steel
is no doubt that the width must also be increased high
If the number of times bitch of efficiency reached being turned over between runs
Aluminium can be deposited at very kind was largely due to the definition equal to that previously
chaine
secured by normally to thickness of 0.00% ment of many of the techniques, inch, zine at 450 pounds per originally employed or first sug-zontal decal definition, hour, normally 0.07 mch, thick.gested by
by the requirements of degree as the iveral den search on other systems and is The sprayed Surface has a mat
Many of the
the
outstand achievements of radar haye able for painting
returned to industry anxious to of tric-
the
You can Speed up a job like this four to six at various angles so important part in the defeat of to improve, or even haaintain to
No METALLIC Woole
I BUDGE
SEL
WITH
Lillington's
NO. 1 METALLIC LIQUID This Liquid is a rapid hardener and at the same time produces a waterproof, hardwearing and dustless concrete. These properties were utilised to the full in the construction of aerodromes and Government factories during the war The use of Lillington's No. 1 Metallic Liquid enabled· Service vehicles to carry supplies over the previous day's concreting, thus speeding the job considerably,
No 2 METALLIC LIQUID-Waterproofs exterior brick- work and affords" complete protection against heavy rains in exposed positions. No. 5 METALLIC LIQUID-Makes concrete floors water
and dust proof.
roofs and
No. 6 METALLIC LIQUID-Repairs leaky SUSHI terraces. E
PAINTCRETE For Exterior decoration. Outlasts distemper and lime-wast
SOLD UNDER GUARANTEE,
Sole Agents:
MANNERS ENGINEERING LTD.
Mercantile Bank Bldg.
Tel 54174
from ali
enemy.
is
korimental
not find these problems to be so acute as we do in Britain, and
may, thmefore, deem it desirable
jcists are sprayed in two runs by British radar" equipment of doubled; for example, 9, and so from the outset have
is
doubling
a wider margin for improvement. David House
The British television industry hs, however, no desire to induce
a rate of 112 pounds per hour, 1 application and further develop the bandwidth, but if the hori-¡ potential overseas buyers to adopt.)
and
finish which is particularly suit respe
en the band-wïlla must not men
doubled, "but "quadrúpied,
Important Fact
The important fact to be re- membered, is that the optimum
The deposition of the coating amply to the D rear in war-band-width is proportional to the
by the automatic plant is more uniform than would be obtained 6 manual spraying and there- fore can be made thinner with- out endangering the efficiency of protection This means a con siderable saving in material
Some New Adhesive Materials
New Adhesive Materials
Improved materials for glue ing up foundry patterns have
on
the lessons
There is no
doubt
square of the number of lines. that before
Though the war we had à long land in dificulty in tocreasing the nam
there is
iso insuperable television over the
rest of the ber of
of lines,
and world. Admittedly the gap tween us and our competitors has facturers are capable
Levers for as many transmitters and
be
now been reduced, but neverthe- less there would seem to be a
of
reservers
our particular number of lines Accordingly it has carried out re-
able to manufacture any type of equipment, irrespective of the technical type of service we now enjoy in Great Britain.
the
Low Cost Whatever system is selected, however, it is important to re- become a service for member that if television is to British manu receivers must be capable of
supply
low and re-being mass-produced at
cost, and a balance must there. 1,000 Fires, fore be struck between three im
beat deal mere to produce, and the number of available radio definition of the picture, mach in fact that television for channels. years would have to
remain the
There is, however, one appli- urtiry, of the very few.
was considerations such as 405-line picture is not entirety cation of television for which a these which led the Government adequate and that is television on Television Advisory Committee scrcins of the size used in cine- to advise the BBC to adhere to the original number of 405 lines mas, where s picture comparable
fund of independent evidence such high definitions would cost overal
Oportant factors; economy,
justify our believing that the post-war pictures sent out from Alexandra Palace are still the best to be seen in any public service in the world.
A Complicated Process Now it is important to realise that television is a complicated process, in that a great wealth of detail has to be transmitted by after the war, and to direct
wearch tow radio in order to reproduce mediate research. adequately the definition and the the most out of modification to the
and shade of the
origins!
remarkable, quality scene. Moreover, this wealth of
in quality with cine-bn-pro- Jection is required,
getting Very successful research QA
the
theatre projection of this quality been carried out in Great
been developed by. 'Aero Res-bas to be repeated at least i reliability at the pictures trans Britain and in addition, great
earch Ltd., Duxford, Cambrid
ge, England. They are applied 25 times a second to give the
mitted from
Alexandra
improvements have been made in
and in the asso-
with a piece of wood to one pression of continuity and are sign anvensity cathode-ray
divre
reediving:
sich have
optical equipment
pertence.
in
halls Since
may
02
surface while a material, called moving scene, the
In order that Hardener is brushed on to changing signals which convey opeme, have certainly justified prove to be the
pidly taken place since the service re- bilevision in rapidly the other surface.
best means of this detail are satisfactorily re-this decision. It has mazût that After an interval of a few ceived, it is necessary that the
the public has
bringing the bedelits of television the hadi advantage minutes. for air drying, the sure reception band-width should be of technical progress in the wide then these outranding within reach of people of faces are brought together and adequate. In the Alexandra Palace design of new transmitting and pulls of Eritash research will held by means of pattern-makers system the picture" is divided, up
recerving equipment whilst im No pressure is necessary as into just more than 400 Torizon permitting old receivers to con-ubtess, be of the greatest im- the materials fill tin the
gap. The tal lines, 405 to be sure... To Hate to fonelion, al least as well Whether used in the home or joint sets
-about three-and-a-
as before.
the cinema, television must be half hours.
The British television industry It will withstand wetting with
as deed made the most of the recognised as a new form
creative art. While it has much out loss of strength, and is not
oportunities thus afforded to
in common with both the theatre. affected by heavy wrapping when
for example, the new
and the cinema, its manner of the pattern i being withdraw
justly claimed to be the best in prisentation differs widely from recently adopted by the BBC is from the mould. It is also proof
world as regards sensitivity that end in either. stainst the effects of weather sad sive
The very stringent require and freedom from distortion.
Itsment bacteriological attack
With natural and synthetic sensitivity is such that a satisfac-cents of co-ordination and tim- "Another new ziherfyn material, used in veneering, beat and soxy picture can be obtained with in between actors, technicians bered on rubber, han..
has been deve mechanical pressure is generally a fraction of the illumination vision broadcast, as well as the and others taking part in a teles 1 for the process of veneering essential and the time factor previously required.
need-for-maintaining continuity with perhaps three or more cameras, and as
"seis', call maudio-
-techin
wood, asbestos, cement, cardboard, various types of wall board and some plastics, also in the case of some materials, it is necessary to apply a primer before the adhe
gives
base
camera
for critical. Under the new process, Deeper Focus vineer to however, boty veneer and
may be kept after treatment in an permits the use of smaller-aper
the base montefish. The bàn
duced under this pro
acid, alkali and milde
it
ill absorb most
strains
likely to
expansion and
Veneer and base.
All types of materials can
Tencered, such as metal, glasa
MeMoreover, since the new camera
„Open - position for a considerable times, as greater depth of forntirely-new=1
time before adhesion is elected
appear to
eviewer as a com
of this
In this respect the process, in can be obtained some
There were, however, other ordinuted white, feed vented by Mz CW Coe, of 134, reasons for the post-war decision It is the Leigh Hall Road, Leigh-on-Sea, to adhere to a picture of 405 lines technique, developed Essex. is very far to the unn Great Britain. Eventually, it key of long experience of rubber later for the dry seating Intended to extend the Ballbustly claimed as i of envelopest
television service to cover grace may
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