1949-09-29 — Page 10

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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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