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HOME & OFFICE STATIONKET Address And note books, chidren's books, chan 143, Very wide mise- sion is available at Bouth China Morning Post, Limited,. on Kong and Billbury Road, Kowluon. Trad anquiries invited.

STAMPS

BTAMP ALBUMS - "Collection Bidider** erica New stock adw avaliable. 13. From South China Aloring Port Ltd.. Wyndham Street and Ballbury Hood, Kowloon,

SOMETHING EXCLUSIVE, Cofire-

slamor to19 packa of Borted From 20 cents per pocket upward. meries. South An entirely new China Morning Port Ltd.. Wyndham

Street, Hongkong

nord, Haloon.

TH

NOTICE

Salisbury

CHINA PROVIDENT LOAN & MORTGAGE COMPANY,

LIMITED.

Notice To Shareholders

Issue Of 326,508 Shares of $5.00 Ench Par Value At A Premium Of $5,00 Per Share A copy of this notice has been delivered to the Neggirar of Com paales for fling.

The satisfactory position of the Company justifies, in the upinion of the Directors, the Issue, at a premium of $5.00 per share, of 325,500 of the unissued shares of the Com- pany to persons who, on 27th July, 1967, are registered as holders of the already insued shares of the Company.

The new shares will rank for dividend pro rata 85 from 1st October. 1967, and In all other respects pari passu with the already issued shares of the Company.

Shareholders will be en- titled to

allotment of

one new share for every four shares held, No fractiona! certificates will be Issued, but holders of an odd number of shares will be entitled to take up a whole share in lleu

of the fraction.

No interest will be allowed

on prepayment.

The Company have agreed to pay underwriting com- mission at the rate of 2 per cent on all the shares covered by this offer.

Shareholders may renounce] their rights in favour of a nominee.

The Share Transfer Re- gisters of the Company will be closed from 29th to 31st July, 1957.

Application forms will be posted to Shareholders on 1st August, 1957.

Application Lists will close

as follows:-

Hong Kong & Macau Share- holders

30th September, 1967

Overseas Shareholders

31st October, 1957

allotment on

1at

and the Directors will pro- cred to November, 1957.

The purchase considotation

will be payable:---

On Application:

$2.50 per share, and

$2.50 on

$5.00

account

premium

of the

On 31st December, 1957:

$2.50 per share, and

$2.50 on account of the

,premium

$6.00

By Order of the Board

8. M. CHURN

Chairman

Hong Kong, dth Joly, 1947,

'THE CHINA MAIL. MONDAY, JULY 18, 1957;

HONGKONG'S WEATHER BALLOONS

WEATHER

The full story in words and pictures

halloons play an im-

portant part in Hongkong's IGY soitvlites. And today the China Mall, with the,klod assistance of the Royal Observatory, presents detalled overail bloture-story about what the balloons do-and the trouble they take to launch -and what happens here In Hongkong ashty riso 60,000 feet into the stratosphere.

This shows the KEW Mk 11B radiomonde (a Brilish type) broken down to show its parts. On the left la the lower half of the cardboard container which houses the transmitter in flight,

Inside I can be seen the small acti-Alled battery which supplies the power for the transmitter in flight. In the centre is the transmitter assembly which is being supported on the top of the cardboard container for convenience in viewing. The arrangement of the three- valve transmitter can be seen.

The sensitiva eldments for measuring pressure, temperature and humidity' are arranged anti-clockwise on Its panel, the pressure element being in the foreground.

4

The windmill which drives a mechanical switch to bring the cleinent into cireult in turn can be seen in the centre of the pictare. This shows the normal arrangement with three arms.

To keep the switch turning at greater heights six arms

the Inter. are being used on transmitters used during national Geophysical Year.

¥

The balloon is now inflated and the equipment it has to carry is being attached. The parachute which brings the equipment to earth can be seen folded on the floor.

300

man on the right is assembling the radar target by means of which the position of the balloon in space is determined during the flight. Radar pulses trees, the ground station are refooted by the target and from observations at the ground the movement of the balloon and its assembly can be calcula- ted. From these results its wind speed and direction at any level can be determined.

7

2

This shows the transmitter assembled ready for flight and in the control screen for anal checking. Departures of the Instrument from ita calibration are determined from readings taken in this screen.. Corrections to readings obtained in flight can then be minde, In this photo the switch is shown with Bix arms.

3

This shows a 1250 gram Intex balloon

In process of in. flation. Filled with hydrogen it is about Bix feet in diameter at the ground.' It will carry the ap paratus used for the upper air sounding into the stratosphere until the balloon bursts.

The bursting height » is very variable and can be anything from 70,000 feet to 100,000 feet. At its bursting height the diameter of the balloon will be increased to about 20 feet.

5

The balloon and ogulprent are now nowembled and ready to start the fight. The man on the right has just released the balloon which is now sscending taking with t the parachute 'and the radar, target. The string from the bottom of the target trails acrom the foreground to the radiosondo trans- mittor (not shown). Eighty feet of string are used to keep the transmitter out of the; warm wake of the balloon. Behind is the rudar which will track the assembly in fight.

TAMİLİ ERORİDEO (2

The launch has, been made. The radiosondo has just left the hand of the man on the left and the length of the whole assembly is clearly indicated.

There was very little wind blowing at the time of the release. Had a freal wind been blowing the man 'would have had to sprint quickly to try. and catch up with the balloon before Manching.

Otherwise the radiosonde would smash into the ground and the whole ascent would be ruined.

8

The operator is recording the sigzinis from the radiosonde. Each signal tants for about six, peconds. During this time the opersfer must tessure the audio frequency of the incoming signal, note the time at which he does it and plot this Information on a straph.:

This needs a high teerde of skill and conventention.

The apparatus grouped round, the observer consists of (from left to right);

n radio receiver, standard frequency forl and accurate audio frequeiry sources in

the centre, rye tëctric clock the liming and a cathode ray, undillioscope for matching the corking, andle wole from the radiosonde via the radio receiver agathat the accurate source,EUNS

* These frequency manuumemente são then converted into ture and humidity values from this calibration graph, for M

9

3

6.

6

The man is holding the radio- sonde preparatory to releasing it at a selected time. In fresh winds it is quite difficult to cÓN», trol the whole assembly and to release it at the correct time so that the radio- sonde is not damaged by hitting the ground or buildings. The next picture gives a clearer Idea of the, apparatus "That must be manoeuvred.

This shows a Guide, Bridge 500 gram: balloon being-relos.ad carrying a radar turget only, This bly, when tracked by radar, will allow winds to be compiled the bursting height of the bill (about: 50,000-6

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