1948-12-16 — Page 10

Poge 10

RN

REKSELA MENTEKT

→

Silent DIESEL ENGINES

Anti-knock cumbustion head,

Totally enclosed.

Silent and Vibrationless.

Electric or Air Starting.

MARINE & INDUSTRIAL UNITS

7-100 H.P.

Enquiries To

SWIRE & MACLAINE LTD.

ENGINEERING DEPARTMENT ICONNAUGHT

TEL: 30331.

Inertol

STOCKS AVAILABLE.

(Roof treated with Inertol)

Sole Agents for Hongkong & China:-

SIBER HEGNER & CO.,

St. George's Buildong.

316 sizes.

07

ENDLESS V-BILYS

CAN BE

CO., LTD.

APB 10

TEL. 22625

Replaced with only sizes of Veclink

As many as 316 sizes of Industrial and fractional endless V- belts can be replaced with only four reels of VeeLink, the link V-belt. From these handy reels required belt lengths are. onickly uncoupled, made endless and installed. Belt re-. placements for any tyne drive are always turnover of Veelin's on reels eliminates spare belt deterior- hand. Rapid atton, Complex, enstly bett inventories are ended. Stock re- cords are simplified. Standard reels hold 100 feet, save stor- age space.

on

VeeLink, goes on quickly and easily...lowers machine down- time. On drives with outboard bearings, it is installed with- out moving the motor or dismantling the machine. Savings en drives of this type have been estimated to run as high as 0/10 the cost of Installing any other V-belt.

VEELINK

ONE LAK

V-BELTO

VecLink-known throughout the United States has proven Itself in service on thousands upon thou- sands of drives. Wherever it is used higher levels of power trans- mission efficiency; are attained.

Athaji Thoy Pa anj' Drive

Tested Proved * Ad

by Industry

Stocks Of All Sizes Available

Sole Agents-KIU FOONG TRADING CO.

26, Connaught Road, C.

Tai. 20403

THE CHINA MAIL, THURSDAY, DECEMBER-10,-1940.

ENGINEERING PAGE

NEW QUALITY IN AMPLIFIERS

Mullard, with their world wide reputation in the field of electronics, have recently produced after years of research the "Loader" series of ampli- fiers, combining elegance with high technical efficiency.

Amplifiers of this series have three input channels

-microphone, gramophone and radio,

The microphone channel hi|the tone controls in the centro! a sensitivity of 1 millivolt, and position, the overall response is is suitable for use with even at

Th generous cross-rectional low sensitivity titerophones without additional sampli- distortion

area of the core minimises from at im frequencies. Aration. Separate channels what p eight-section primary arc provided for gramo- enstres low lenkage with an ex- phone and radio. The chassis wellent high frequency response of the 25 and 50 watt ampli-jund wuve jom. The output imn- fiers are turned out in tabits or pedunce adjustment allows the ruck mounted form as desired, secondaries to be connected In series-parallel-or paraflet glv- The Circuit

Ing output voltages of 1100 volt: The circuit employs resistantem and Impedance 400 ohms for the apaeny coupling, ushog eigo | 20 wali amplifiers, and 100 volts valves for 50 wants and seven end 200 ohms 'impedance for the for 25 watts, the 50 Watt ampli- | 30 watt amplifiers..

has

using 2 x E137 vives 126 Moliard Electro accoustic equip- class AB, { with feed grid bian | geni

many applications, nd 11. T. apply, Both circuli Some of these are to be found in

obloy a double triodo MULLARD | 8|E-PORTS, churches,

cinemas, FC 32 s phase spiltter for docks, factories, "hotels and re- freding L push-pull outpur stants, barracks, offices, rail- way stations, schools, and univer-

toge,

The repay characteristic of 1 mities. the "Leader" series of amplifiers. Mullard Electroule Products with tone controls central, is with are on display at the Gloucester

Areude. U1 plus-or-minus me decibel Comuna 40,20,000 cycles, and the total harmoniset distortion does not exceed three per egit, Careful design of the eirea allows 90 per cent, of the full output to be obtained at 40 evetes and 20,000) cycles an excellent feature thuse amplifira.–

of

Cease Fire In The Navy

PROP TURBINE TEST.

આવી વસ્તુ

75%

The Ideal.

For the

HAMMER

Building Contractor!

ELECTRIC

KANGO HAMMER

For concrete-vibrating, boiler-scaling, cut- ting chases and drilling for rawlplugs, Kango is the Electric Hammer contractors have been waiting for!

100% British!

Lengths 19 ins.

Weight 12 lbs.

Blows per minute 1550

se tient on

GILMAN & CO., LTD.

ENGINEERING DEPARTMENT,

4a. Des Voeux Rd., C.

Tel. 27017.

18 minutes

3

30

60

The final fixing of the propeller shrouds before beplaning

the special 505 hour endurance test, Propeller turbine history was celeration made when the Armstrong Std- Maximum take-off deley "Mamba" completed 300 Maximum cruise beuis of sealed running with- 70% take-off power out anything more than minor

this servicing. Had

engine 58% bern-in on-aircraft the distam Final acceleration, flown would have been about 150.000 miles.

A good deal of attention-is-pak Tone Controls

u the reproofing of the wooden lecks of warship in Britain's Independent ass and treble Royal Novy. Wood can be pro- one controls are provided, which fected against fire by surface the official supervision and cord

The lost was carried out under cerate on

three channels, gouting or by impregnation, a⠀ These trais provide ample, ince host and cut to meet all ner coating, for example with Thirty-four periods of five hours Strul of the Air Registration Bourd, plaster dr mixtures 'Based requirements. With bestos and other siliceous matter up the 300-hour total of the test, duration and 33 of 10 hours made

Each five-hour period consisted

correctio

UNIFIED SCREW THREAD SYSTEM

An unusual but significant lustrial part bus been sig whereby Britain, Canada and the United States agree to standardise

on

bonded with sodium silicate, ha

the advantage of ewsy application.

taxying

C-

esp

clafly to timber, and caInitial starts, idling, offer high resistance 10

to flame penetration and the spreading of fire. Such

coatings ure, how- ever, much less effective than impregnation chemicals. These are holuble" in- Breproofing with organie salts, chiefly ammoniurn phosphate, such as are employed

in the fireproofing of textiles. The

und

High-Vacuum Equipment

65% 605%

..

inxying etc.

仆

Each 10-hour period consisted of two of the above periods. strument readings were record- During the test over 70,000 in-

did 370,000,000 revolutions, and ex. The compressor and turbine.

ench turbine blade travelled & distance greater than from the Earth to the Moon at an average speed of over 000 mph.

More Electric Motors Now

the ordinary screw thread. The salts are often combined with a with pumps and vacuum equip-tric motors is still acute, but, Several new devices for usų The supply position of elec- agreement will make Parts Di

machine small proportion of a rot-proof-mint have been put on the mar owing to the improved produc- of, British €12 American manufacture interchangeuble,—ut:

Icing compound.

The salts, In

EARTH TESTING?

"Simplified

"MEGGER "* Earth Testers meaturs the resistance to earth of earthing. electrodes quickly easily — accur ately. Used throughout the world by electricity authorities, telephone and celegraph engineers, railway companies.. oll companies and other Industrial undertakings. Special Instruments available for earth resistivity surveying. Manufactured by the makers of the famous "Megger"FasulationTesting Sets.

THE

Registered Trade Mark

In a hot water solket by W. Edwards-at-Co., Lu, tjóninethods employed-in-a} empus the ty for any years beton, are applied by brushing. London, S.E. 20., England). The large modern factory recently

of London (Kangley Bridge Roa cause the angle of the threads of spraying or sonking the timber, new devices include controllable complete screws, bolts 'ned nuts

the Hopkinson differed by five degrees.

by The British have

pressure Impregnation. Jenks for the continuous admis-Electric Company, Limited, is used the Whitworth thread, hav- do

Surface application by brushing, sion of small quantiflet of gas to steadily altering these condi- ing an angle of 55 degrees, since

does not give much protection In 1831: The United States, since some protection at first by modi- valve to be noted and repeated. wide range which can be sup-

anintense fire, but-stocs give uum system. A dial allows tions. In fact, they are now JARDINE ENGINEERING CORPORATION LTD.

give any particule selting of happily, placed by having a 1834, has used the Seilers thread yg the decomposition of

14-16 Pedder SL.

Hong Kong. with a no depress ungle.

the Another equipment consists of Numerous attempts have been formation of flammable gases is and micro-switches to form pres- of motors since

surface layer of wool so that the various combinations of hellows plied from stocks.

Hopkinson's have been makers made during the last 30 years to reduced, mid a frm heat-insulat-sure-controlled reins capable of pioneers in the construction of the 1080 and are effect on international agreementing layer of charcoal is formed. operating a Da screw threads but it was net

half-horse-power fractional type. These, although until 1943 that moves leading to tained with pressure impregna-

By far the best results are ob- A.C. motor, the pact were begun.

of less than 1 HP, are of exactly. One version tion which affords deeper pene-switch

can be

used. the same heavy industrial con- This

his common

standard will be fration. In Britain the most im

off power supplies, or startstruction as the larger machines knowa the United

Sere portant process is the patented vacuum system reaches any pre- arduous working conditions

a motor, when the pressure in a and can easily stand up to the Thread system and the agreement

"Oxylene" process which "ušel o dermined value. Another up their bigger brithers take as will establish several classes of solution of SCTOW threads with compromise

mono-ammonium plication is as a safety device matter of cause.

Since the cessation of hostili-

s

that

a

dimensions. The puct will great-/ Phosphate and a small proportion which comes into play when the

of boric acid in water. The tim-rate of flow of liquid in a tubetles, Hopkinson's have been work- facilitate the sale and main- tenance of mechanical products and vacum treatment before im- instrument is also supplied in a

ber is subjected to a steaming falls, outside chosch imits. This ing at top pressure on the export among the three countries, as re-pregnation.

Firive. Recently an Argentlijm placement parts for Imported

form which indientes the rate of textile frn, which was convert- Much of the timber supplied in flow on a dial. It is believed that automobiles, washing and hundred of other items, can warships has been fireproofed by will be found in apparatus which chased 106 Hopkinson totally en- machines recent years for use in Britain's many applications of these units individual electric drive, pur- ing is machinery from shaft to he made in the buyers' own this process with generally sutis lids to run for long periods with-closee notors ranging from 1 to country.

factory results.

¿

BUILDING SUPPLIES

Baths 5'6" Cast Iron White Enamelled

Both Fittings Chromium Plated

"Shaff" Bib and Pillar Tops Hot and Cold

Wash Basins

Wash Basin Fittings

Sinks, Earthenware, Aluminium, or White Enamel

on 'Stool

Toilet Suites

Toilet Seats Plastic White or Black

Cast Iron Pipos 4“ ·

Copper Tubos 14" to 2" Pipe Fittings Galvanized Iron

Gate Valves 1/2" to 1′′.

Flush Valves "Victory". "Sadia"

Electric Water Storago Hicators

Stocks Corried

REISS, BRADLEY & CO.

National City Bank

of New York pldz

2 Queen's. Road Central,"

HONG KONG.

LTD.

aul attention.

HOPKINSONS

#15 HP.

ELECTRIC

RANGE FROM 1⁄4 HP.

MOTORS

TO 100 HP

STOCKS NOW AVAILABLE

IN

HONG

KONG

SOLE AGENTS:

W. R. LOXLEY & CO., (CHINA) LTD.

YORK BUILDING.

BRC

FABRIC

ELECTRICALLY CROSS-WELDED

STEEL WIRE MESH

IN ROLLS OR SHEETS

FOR CONCRETE REINFORCEMENT

Stock Avaliable

DAVIE; BOAG & CO., LTD.

Chartered Bank Bidg."

"

Agents. for

BRITISH REINFORCED CONCRETE Eng. Co

Tel. 28117

CO.LTD.

K雞肉 ·

KEUFFEL & ESSER CO.

AVAILABLE STOCKB

DRAWING SETS TRACING PAPER

SLIDE RULES AGENTS & DISTRIBUTORS

ANDERSEN, MEYER & COMPANY, LTD.

LEVELS

FORESTRY COMPASS

DAVID HOUSE!

TRANSITS

STEEL TAPES

TEL: 20001: