1948-07-29 — Page 8

- Page B

THE CHINA MAII., THU NSDAY, JULY, 20, 1948.

"YORK"

▾

REFRIGERATION AND

AIR CONDITIONING EQUIPMENT

THE JARDINE ENGINEERING

CORPORATION LTD.

14-16 PEDDER STREET, HONG KONG.

TELEPHONE 30311.

The SINCERE Co Ltd.

HONGKONG'S GRBA DEPARTMENT STORE

SOLE AGENTS

FOR.

Farnsworth

RADIOS

KNOWN FOR TONE

Inertol

REGD. TRADE MARK

Products for Waterproofing_and Protection of Metal Structures, Concreto Surfaces and Brick- work.

Stacks Available.

THE INERTOL COMPANY, LIMITED, Hull, England..

Sole Agents for Hongkong & China:-

SIBER HEGNER & CO., LTD.

St. George's Building.

BRITISH

ENGINEERING PAGE

MARCONI RADIO TELEPHONE

Due to the great advantages The very wide pass-band en- the noise-limiter to the 1st nudlo | 200 watt, 50 watt, 2 walt and 1/4 derived from the use of very sures substantial elimination of stage and thence through the low-watt equipments, all available in high frequencies, such na signal fading when linked with diversity pass Blter to the output valve. the frequency bands 63-186 noke ratio, speech clarity and transmission on slightly different Control Unit: This is a small megacycles. economy in space, these bands frequencles, Delayed A.G.C and box suitable for inaunting on or Following are examples of tho are now in use short

a very efficient noise-limiter are near the dash-board and mount- į varied uses of Rudlo Telephones. extensively where range communication is incorporated. This mitering all the controls necessary for A provincial taxi Arm In Eng required, and where the

use of operates on impulse noise, cutting the upemtion of the entire equip Innd now communicates by radio- land line is inconvenient or im-off the peults. A low-pass filter ment. There are four switches telephony with its cars en route. possible. The applications of such is filted, cutting off audio fro- on the panel. Connected by

This hus resulted in a much a system are particularly suit-quencies above about 4 kce/s, and flexible lead to the control units speedier service to clients and an able for polke, fire, harbour and!

estimated saving of 25 per cent airfield control services, apart

in operating calls. The sels are from a wide range of usefulness

fitted in the luggage boot of each in public utility and commercial

car and controlled by the driver undertakings.

from the dashboard,"

be

The Marconi V.H.F. radio telephone equipment, Type H. 16, in designed for such services. It has a nominal rating of 10 watta unmodulated carrier to the aerial and

сап

modulated પત્ત telephony up to 95 percent. It operates on any spot frequency in the bands of 05/185 Me/s and is crystal controlled. Background noise on V.1.F. h low and the limiter use of an emclent noise cute out ignition and other electrical interference,

The transmitter

rack. with into absorber mounting, easily_koused in a convenient corner. The re- mote-control unit and micro- nero- phone can be fitted on or near the dashboard with the loud-

and

receiver shack-

speaker in any convenient post-

tion. The loud trailer for direc- live control can be carried in a position affording the must ef- fective projection of Lound, whilst the vertical rod serial on Its flexible mount is intended to be fixed to the vehicle root or

Power may be derived from 6-, 12 or 24-valt battery. Ser- vicing of the equipment is made easy by the use of sub-punels, with plenty of space to allow ne- to all components, Test points, are providect at soltable places.

Crystal Control

The 10-watt "Fixed" Installation.

The 10-watt Mobile Installation in the Boot of a Police Car.

On the same principle several lowing companies have equipped their lugs with 1.10. The sets are also proving very convenient for chip to ship communication. especially when two or more tug are working in company. The British Post Offee are now con- nkterlag a scheme whereby tugs in the Thames Estuary will be connected with their shore offices VHF Links and the normal via telephone service.

now

Mobile VIIF equipment is i alra being used in conjunction with radar installations for the control of shipping in conditions of bad visibility. Radar provides the Harbour Authorities with a complete picture of Versein navigating the harbour area and the Marconi VIF RT

enables

them to direct the movements of ships and ferry boats so that they can proceed safely and expedi- tiously, however thick the wea- ther may be.

Press Reporting

The latest development is VHF communication 1 Press pur- poses. Marconi VIP equipment made newspaper history on Saturday, April 24, when corres porcients from Kemsley news- papere reported the final match for the Football

Association

reply by wirelers direct to their uffle. This was the first time the output is, fed lato a low-im-, is the hand microphone, and on that radio has been employed for planet loud-speaker, giving ap- this is the send/receive press newrpaper reporting since an at- Temnofiltter: The drive is

switch.

Incation of wavelength had been crystal controlled, the final fre- proximately wait..

The crystal oscillator beats with The Type H.13 A, whilst ful-mude for this

purpose. The quency being reached in the first the incoming frequency to give filling similar technical functions experiment Waa ត successful stage. The crystal is operated on the 1st LF., and L-cuts again with to the above, is designed as a that Kemsley newspapers Imme- its third overtone, and the this to give the 2nd IF. The re- fixed station for operation from diately used Marconi VHF equip- third harmonic is taken

Outsultant 2nd LF. (4.80 Mc/s) is AC mains. The frequency mo- ment again two days later to version of the above cover the drive of the King and ed harmonies are thus well retaken through four pairs of cir-dulated

similar in appear- Queen through London on moved from the operating range. cults and three amplifying valves equipment

to the detector and A.G.C. diode.ance and operation, and remain- crension of the Royal Silver If the crystal fails the overtone The audio is now passed through der of the range is made up of circuit will not oscillate, And hence the crystal control is com- piele.

from the anode circuli; unwant-

An intermediate amplifier leads to the final amplifler, which em-

ploys dust

an air-cored coil, iron- aores being used in the pre- Circuits. Mëtër points are |

throughout, and the

unf

Protection Of Metal Structures

Wedding,

Olympia Exhibition

the

METAL WINDOWS

by. GIBBONS

GILMAN & COMPANY LTD.

ENGINEERING DEPARTMENT

Telephone 31146

HOLOPLAST

I BEGD. TRADE MARK I

LAMINATED STRUCTURAL PLASTIC

Partitions Floors

Cupboards Benches Coachwork

FOR

Doors Coilings

Hotel Bars Furnituro Shipbuilding

Electrical Switch Gear Mountings

The

"Holoplast" materials are manufactured in the standard dimensions of 8 ft. by 4 ft., the structural panels having a thickness of 1 in. while laminated plastic linings are also available in thickness from 1/16 in. to 1/2 in. standard finishes available are natural brown, cream- "sprayed or incorporated wood veneer.

Choose "Holoplast" for:- ก

Strength Rigidity

Fire Resistance Ease of Erection

Resistance to Vermin

Resistance to Moisture

Sound Insulation

Resistance to corrosives

Sole Distributors

The first national Mechanical output stage has Jacks En the

Handling Exhibition closed grid and anode cir

circuits, the for-

Olympia, London, last week nf- mer Indicating the amount

To combat effectively the many acids). Cement is the most vul- ter a

very successful fortnight. drive and the latter the feed and enemies of concrete and to pre-nerable component of concrete Attendance figures for this highly aerial

All circuita

are ac vent the corrosion of metal work, and this is attocked before 11 has specialised display were remark- curately pro-tuned;

the

two the Inertol Company has develop- properly completed its chemical ably high, visitors including buy- crystal oscillator circuits by ed outstanding protective coatings conversion. Gradually the ers-from-23 countries numbering tising a meter in the grid of the during 35 years of research. chemical-carrying moisture cats 4,000 daily. next stage, and succeeding stages: Experience has shown that the into it, and slowly but surely More than 120 British firms by using the appropriate meter worst enemy of concrete is water disintegrates it and eventually is were, represented, the exhibits Imperial Chemical Industrias (China) Ltd.

containing various forms

of destroyed, and with it the com- being broadly divided into four The crystal drive employs chemical substances (salts and plete concrete structure.

main groups: fork-lift trucks, crystals in evacuated envelopes,

In its essentials, the case of conveyors, cranes and hoists, which have several advantages.

iron and steel is identical. Iron There was also a wide variety Anode modulation is employ-

and steelwork that is exposed to of subsidiary products such 08: ed, using push-pull modulator

water, steam, salts, and

and acids, special beiting for conveyors, valves in Class AB. A doubic-

diesel vode, until finally it he

is liable to rust clectric,

petrol bution microphone feeds audio

engines for providing motive signals directly to these valves

power and special tools for ser- through slep-up

transfer. I

Water-proofing compounds must vicing and maintenance,

These.

points.

Audio output is taken to a

Elevator Conveyor

transformer on the R.F. output | For Rice

panel, there being also

an

auxiliary winding delivering

audio power to the public-ad- Models and exhibits of

trol

unit

acid

and

corrode,

uscless and dangerous.

and

not be confused with the usual too, attracted considerable atten- anti-rust paints; it not

tion and a due chore of overseas not only pre serves iron, but what is far more orders. dificult, prolongs the life of con- While total figures of the ex- con-erete

work. The standard grade Port business concluded at this dress loudspeaker (haller), hand-veyors and cranes which of Inertol is black and produces exhibition are not available, the ling about 12 watts. This P. A. being sen't 10 the Far East a glossy finish which is water- returns of individual firms show speaker is normally used for were amongst those shown at proof, acidproof, elastic, resists that a large volume of

orders traffic control or harbour con- the Mechanical Handling Exhib abrasion and withstands dry heat was received. Argentina placed trol, and a switch on the Contion in London. Amongst British

con-

up to

an initial order worth

£50,000 to 450°F

99,000 changes "Radio" to firms represented at Olympla, the

me exhibition hall, wore some which able mixture of cement, sand a- from

Concrete is a chemically vulner- and another important overseas "P.A." a three-position volume control operating both on P. A. send products to Burma. Malaya, grexate, und water, the free lime also expressed themselves as well crder, for pneumatle tubes, came

Finland.

The

exhibitors anet on receiving volume. It is Bium, Dutch East Indies, China, in the possible

cement easily Hong Kong. Many chemical combinations and Japan and

forming satisfied with the many hundreds to speak loudly

with the closely into the microphone with have their own agencies in the c

of useful enquiries they had re- solutions out Jutroducing noticeable, dig-Far East and a wide interest in more the

and gases.

ecived from overseas buyers. some of the latest ingenious pro- tends to leach out the lime con- tortion.

pureat ducts has The power panel

already been comprises the rotary converter, relays and by prospective buyers from the tent: the greener the concrete the more vulnerable it is, and the distribution boards. One relay is Far East.

ja great sooner it

protected after ence the better. placing against outside interfer-

With the

knowledge of the correct proportioning of the concrete ma-

shown

One exhibit attracting used for Radio P. A operation, attention is the one for heater supply, and one Douald patent elevator conveyor new high speed for switching in the machino. This latter relay on "make" - suitable for moving bags of rice.

and other cargo of a uniform

PRECISION MICROMETERS

FITTED WITH

The

water

Electrical Hygrometer

Scientists in Britain have de-

80 makes the H. T. circuit and nature. It is manufactured by terials the engineer can produce a veloped a machine for use in the breaks the receiver machine, and townson, Drew and Clydesdale concrete to withstand certain con-cotton industry which has allow loudspeaker circulis.

Receiver: The receiver has it for years but this is the first be withstood for the life of the in production. It measures the Ltd. They have been working onditions, but then the conditions to ed of a 10 to 15 per cent. Increase single crystel-controlled oscillatims it has been exhibited. The structure must be known In ad-moisture content of the yarn by tor and incorporates double fre- port of Rangoon has been la-vance.

alextrical means,

Warp yarn, quency-changing, which yields vestigating

of knows of more the enginess wefore going to the loom has to the possibility

the importance of several advantages.

of proper using it for moving rice,

design the more will he appre-

bo specially treated by dipping Apart from elevators, Eastern buyers are particularly cont

Farclate the value of a protective in a size of starch and fat to pre- It coating which is interested in branes.

Is then dried to suit the humidity of crane, manufacturers, Thomas ture thun arance to the struce in the weaving shed to which

One firm guard and ins fa an added safe-vent breakages in weaving. Smith and Son, report they have especially appreciated for the pro- tent is more than nine per cent.

protected. Inertol

It is going. If the moisture con- already had several serious In tection affords to concrete sur- quiries from the Far East. At fuces which cannot be inspected, mildewed while in storage.

the yarn is likely to become the present time a huge electric as in the care of bridges, plers, gantry crane is being built for harbour structures, sewage, water, skilled workers, who tests

It has been found that the dock work in Hong Kong and selectric and it not rust, but un-i thumb and finger, usually allows the cranes for docks in Malaya are

chemical. plants.

yarn for molaturd between his Furo going out soon. The firm KAY fortunately the cost is prohibitive, a safety margin of two or three they can guarantee quick dc.

so for many years. iron and steel per cent., so that mobtic

the moisture been painted to prevent cor- content been

ent is usually well below MOORE & WRIGHT released by the War Office.

exposed to sunlight in ut- Now the electrical-

· hygrometer R. IL Neal and Co., Lt crane mospheres where little moisture measures the moisture content of (SHEFFIELD) LTD. specialists, also report increasing is présent, but it will be found the yarn as it comes off the ma

trade with the Far East after the that they saponify when in con- chine and registers it on a meter. Sol Agents:

dearth of the war years. Antact with water, such paints there. The result is less wastage of yarn HONG KONG & SOUTH CHINA C is at present being formed fore are not fully protective nor in storage due to under-drying,

The more YU TUNG TAI, LTD. in China and Regolla Uons waterproof.

theso l'a: great saving of" fust because going on for die in Japan,, Their metals are exposed to moisture, the yarn is not over dried, and crades, sro, famous throughout gas fumer or solutions"the"more] (an increase it production boy [tha': world ̈ ̈ for their externe important becomes the use of kaung: the machina Cza

ru mobility.

special protective agents, vagy

HARDENED AND THREAD GROUND SCREWS

OUTSIDE MICROMETERS

DEPTH GAUGE

INSIDE MICROMETERS

BEVEL PROTRACTORS

M&W

COMBINATION SQUARES

SURFACE PLATES

OTHER TYPES OF PRECISION TOOLS.

215, Queen's Didg.

livery of dienci electric

crades which ́have

iron

has been

verted from war time equipment an Many paints are excellent nine per cent.

Bre

Prince's Building

Telephone 20058.

BRC

FABRIC

Chater Road

ELECTRICALLY CROSS-WELDED

:

STEEL WIRE MESH

IN ROLLS OR SHEETS

FOR CONCRETE REINFORCEMENT

DAVIE, BOAG

Stock Available

CO., LTD.

Chartered Bank Bldg.

Tai. 28117

Arenis for

BRITISH REINFORCED CONCRETE ENG. CO.,LTD.

With over 75 years of insurance experience in China & Hongkong

BUTTERFIELD & SWIRE

(Insurance Dept Tol For all Personal Gy

INSURANCES