1949-12-22 — Page 12

THE CHINA MAIL, THURSDAY, DECEMBER 12,

MIDGET HIST

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ENGINEERING PAGE

GREAT ADVANE

ADVANE IN TV TRANSMISSION TECHNIQUE

The London-Birmingham Radio Telovision Link, which was demonstrated last month by radio, on- gincors of The Genergl. Electric Co. Ltd., of Eng: |load, marks a great ad- vance in television traps- mission technique, and places Britain right in the forefront of tolovision development.

Indeed, it can now be fairly claimed that nowhere else in the world does there exist a television relay system :*4] technically advanced for con- tinuous public service.

The many new Inventions en. bodied in the Link and the in- voluble Information gained during its construction will be of the greatest value in designing radio Boks for other telecommu rication projects, such as inulis. hammed telephone. teleprinter and picture telegraph sysiens.

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ENGINEERING, DEPT.

mt Bireet

Next to 8. C. M. Past Bldgs

Even givoler possibilities be envisaged in their lise establishing comminications over desert country. Fiver crossinge and even

jungle country. temain

131

J11

where the nature of the renders virtual), impossilde the use of mong mat communication.

Hy

It was in Mur, 1947 that contract for the desigo. ររាងៗ! * facture and installation of n ra- dio Televisiva link from London to Birthingham was awardedl to the GEC of England by United Kingdom Post Ofler, which is providing the link for the BBC Midland "Station.

יוh}

In its simplest terms this Lon- don-Birmingham television dink ay be described as a system of ultra-high frequency radio raus- mitter and receivers by meatis of which the London program- mes will be relayed to the Mki- Innds, During the next Arx months further equipinent wil be installed to enable signals to be sent in both directions. To begin with only one-way trafe will be possible, but this will be reversible.

Process outlined

The radio-link comprises six stationantha Museum Tole. phone Exchange, (London), Harrow Would, Dunstable, Blackdown (near Charwelton). Rowley Rogi (near Birming- Mam) Rnd finally Telephono House, Birmingham, Each rr. the recelves peater station sigdal from the providus station, amplifies it and trans- mits it to the next one. AL

directed

each amplification the power power, the signals are

10 between statious in the form of!

a narrow beam.

of the signal is increased million Umes.

Height of towers

Exterior .OF transmitter cabinete, showing afternative transmitters.

have to be constructed accurpey imituot half-an-inch,

to

an-

Route

of

tha London.

Birmingham television radle.

ratay link.

ENGINEERING NO LONGER "MEN ONLY" PROFESSION

There are now about. 1,000. women in Britain engaged, ii responsible engineering work. and it is becoming increasingly

J...i

DESIGNERS OF COMPLETE ELECTRICAL SCHEM AND SUPPLIERS OF ALL. ELECTRICAL MACHINERY.

the custom for more progres- Metropolitan-Vickers Electrical Export Co, Ltd.

sive engineering firms tp ap- prentice girls.

At most of the universities and technical colleges, too, wurden fre attending engineering courser en equal tenns with men,

The first women engineers! in during Britam were amployed World War I and afterwards there were a suflelent number to form :he Women's Engineering Society. World War II gave them op- Sortunities, and after an Im- mediate post-war decline, num- bars again bean to increase.

A woman engineer was

chosen 38 assistant to the engineer .in Charge of the building of Sydney Bridge, Australia. The only woman marine engineer was des World orated for bravery in War II.

are

The signals ara tepnamfited on fro- a wavelength of about 30 con- Because UHF (ultra-high

follow straight timetres and by reason of their quency) waves

in being beamed and also because Serevent their relecting pro- llues each station has to

a very complex perlies being altered by the for sight of those on either side of apparatus of

While they are finding It dim- it; for this Yeason they are nature would be needed the motion of leg clecirle heating usually situated hhi tops, the signals are not suitable for Fe-wires are provided aside the cult to obtain employment in the

theception by the general pubile. tubes,

heavier industries, women aerials being mounted at

Only the vision prograthrnes - An important feature of the making progress in automobile summit of a lower so as to obtain extra heighf,

qutp-engineering and in chemical work The distance he will be sent over the link: "The UN is that it is entirely

Allithe re-jand metallurgy. Some of them tween stations can be anything accompanying sound will go over matie in operation:

peater stations are capable o concentrata on design, but à up to 40 miles, but owing to the Post Office lines.

Working almost indefinitely with- number hold posts of a manager- natural contours of the land be-

put attention, Should a fault lal or executive type covering tween London and Birmingham,

develop duplicate equipment such branches of the work as some of the stations are no more than 10 or 20 miles apart.

The highest serial towers automatically comes into service, planning, estimating, factory lay- erg at Londan and", pleming and the control engineers in out and buying and selling,

and Birmingham ↑ are mer he hám and ard respective London

and 1981. have informed by means of signal street level: each lower walan311ghts the fault tas pecurred about t£ cons,

on folent, that the stand-by apparatus

isin operation. The use of beaming demands in the television link has beep highly directional serials & wale!

ons hood.jamost arb mounted at the top of the stringent" cification drawn - up towers. They consist of pral; by the Rad Branch of thi rods, no more than six inches office of the ghitër in-Chief of long, ingunted within a parabo- the United Klärdom Post Omeg toid reflector formed from: light; it being

amjongst Uputated, Alloy tubes, In order to secure other things, that th

In order to avoid the necessity for relay stations of unduly high

CONVECTOR

No. 751m kw. Ske

Bellin

NTY

167 ft.

b well-defined radio beam these shall be capable of extension, up reflectors, which are 18 71, aerdes, 1 to 400 miles..

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