1948-12-23 — Page 10

THE CHINA MAIL, THURSDAY, DECEMBER 23, 1948.

EARTH TESTING:

** MEGGER "** Earth Testers measure the resistance to earth of earthing electrodes quickly easily accur ately. Used throughout the world by electricity authorities, telephone and telegraph engineers, railway Companies. oli companies and other industrial undertakings. Special Instruments available for earth resistivity surveying. Manufactured by the makers of the famous "Megger" Insulation Testing Sets.

THE

Simplified

*Registered Trade Mark

JARDINE ENGINEERING CORPORATION LTD.

14-16 Pedder St.

Hong Kong

BRC

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IN. ROLLS OR SHEETS

FOR CONCRETE REINFORCEMENT

Stock Available

DAVIE, BOAG & CO., LTD.

Chartered Bank Bldg.

Agents for:-

BRITISH REINFORCED CONCRETE ENG. CO.LTD.

Tel. 28117

ENGINEERING PAGE

PAINT RESISTANT TO GREAT HEAT WILL REDUCE FIRE RISK

By Charles Lynch.

As a result of laboratory research carried out by the Australian Council for Scientific and Industrial Research, Australia can now produca paints which will resist tomporaturos of more than 1,000 degrees Fahrenheit.

Use of these special pigments will, it is believed, re- duce the general risk from fire as the new paints would form semi-protective coverings for build- ings.

importaner to the steel and bulld Ing intiustry, and new applica- tions of the process may be found

important commercial other outlets.

Thr Hrstyl

paint Titanate when tested on the main flue stuck of the brown coal power dafiem at Yallourn (Victoria) was most impressive in its per- formaner. Normally, on to

unce of strel per square foot is removed every six weeks, at tu Yallourn flue stack.

Corrosion Checked

After 12 weeks the new paint was found to be excellent con- ditieri, huweyer,

the stand Erosion was effectively checked.

Test samples of ordinary paint) applict the same thine hind en-

ely disappeared.

The conclusive remitts obtained date are based on careful Inborntory work only, and the next stage will be extension to commerical production.

Dry Yarns Can Be Spun

An entirely new system of rov- ing, spinning and twisting ma- chinery, which opens up for re-

In addition to ita hent-re. alatant propertien the new paint also provides superior protenebing possibilities for the cen tion against salt water corro: slon, and in thus of importance to the Australian shipping in dustry.

Preliminary and incompleted

rifugid spinning of all dry fibre yarns, has been invented by un Prince-Smith" mal English Orm, Steils of Birlington Shed, Keigh- leg, Yorkshire, The system is that ships require regarded as the greatest develop- palating less frequently in order ment since Sir Richard Ark- La amintain etheleney, and as the wright invented the yarn spin- new paint is not inflammable, frening frume and Samuel Crompton risk will be greatly reduced.

the spinning mule.

testa

ا 1100

Powder Makes Them Glow

This weaving milt in ane of the many factories which have found tubular fluorescent lampe to give the high quality Hight. ing required for the work.

The light of TL lamps is pro-, of light. Which of the colours a certain case The basis of the new interest-

duced by the fluorescence of a is preferable in

on the circumstances. ol the depends ig product Is Butyl titanale.

The centrifugal system of spin-powder on the inside which is produced from rutile and ning wet yarns has been known tube, this powder being made Generally speaking for utility lighting Coffices, factories, tech- fiminite, major components of the ever since the turn of the contury luminous by the action of ultra-nical drawing etc.) the white, co- heavy beach sunde deposits of the when in connection with the vis violet radiation.

lour will be chosen: this colour Enstern

Australian const. Re-core process, C. Topham Invented Since it is of great Importance blends well with the light of in- eetly, plans have been made to the spinning box, 4 revolving that this ultraviolet radiation in candescent lamps as well as with work similar deposits in the State cylinder in which the very tendar conerated with high efficiency, natural daylight. of Western Australia,

luments were.coiled by centri- low pressure mercury discharge Australia has good supplies of fugal force as they were drawn is used, and as the pressure of the rare minerals which come from the spinning bath. The the mercury vapour depends from the

the beach sands. The im- portance of these sands has been considerably enhanced since one of them, munazite, has been re- cognised as a source of thorium, Thorium. is of importance in the development of atomic power.

In cases where a colour.ren- dering almilar to that with na- tural daylight is raquired (21 in the textile and graphical Industries) the "daylight" co- lour will be preferred, while, for a warm, cosy Ighting (restaur. ants, living rooms) a Warm- white colour lamp a

le recommended

In several countries.

As mentioned before, the per- formance of the lamps depends largely on the right pressure of the mercury vapour being main-

case of a low

ច

significance of the present new upon the temperature of the tube, invention is that the centrifugal the latter hos to be made in cer-

dimensions. spinning of dry fibre yarns is, now tain

These and possible for the first time. The other considerations fed to the systern involves, machines for development of the now familiar drawing or roving, spinning and lang tubular lamp. twisting, ench of which may br For a gas discharge used with other textile machinery distinction is made between the Zircon From Sand

of the normal type.

ore voltage and the striking volt. Among the componios exploit- To gain full advantage of the age. By arc vollage is meant ing the beach sands products is system all three types of machine the voltage between the terminals Zircon Rutile Ltd., at Melbourne must be used together. In each when the lamp is burning, whilst (Victoria) which has an up-to- process the principle is the same. the sirlicing voltage is the voltage tained. In date laboratory at Botany Bay The machines will continue to necessary to start the discharge, bient temperature the luminous (New South

th Wales)

unst carries run through ment-time

low level and breaks this lutter voltage being gen- flux drops to nut experimental research at and on overtime without allan arally much higher than the there may be difficulties in thi

the.. South Yarra (Victoria)..

Other advantages include former.

striking of the lamp. The low- The company collects the sands higher speeds, larger packages, To restrict the striking volt est practical temperature-Imit in dragline scoops and bulldozers fewer end breakages, fur less labago various

Le ap is about C. High temperatures and the recovery plant employs a our, less floor space per pound of piled, one of which is the use ton eatise the luminous flux to notation process which removes yarn, and higher quality yarns at of

which drop, though not to the same at of preheated electrodes, zireon. Ilmortite, monazite lower cost. The new system was are connected by means of a bi- extent as in the case of low tem- and other constituents are re-designed primarily for the worst-pin cap and lamp holders. Fur- paratures. covered magnetically, leaving be-ed spinning inde

industry.

The thermore the lamps are provided The lamps are not very sensi-. hind the rutile.

vontor Arm will concentrate onj with an Ignition strip, a thin tive to mains voltage fluctuations, Australia is the world's lar- this section but Britain's Texille conducting strip running along in which respect they have an

advantage group, with the length of the lamps.

ever Incandescent gest producer of zircon, which Machinery Makera

Philips with rutila which the inventor firm is usso- in officially listed

are now turning out lumps. (Sole agents for Philips develop will and itmenite In production

the system come types of TL lamps. These TL lamps, Manners Engineering clated, statistice. Last recorded figures for processing spun rayon, cotton are supplied for different colours' Limited) (for

1043) stimated annual and other natural fibres. Manu- production values £A69,084 facture of the new machines in- ($221,008).

volves special plant now being in- The beach sands resources may stalled, and it will be some time easily result in Australia becom-ed for general use in the textile before the machines can be offer- ing the pluneer producing coun- Tel. 32227.

ify In oxplotlution of product of industry.

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Arc Welding ROBOT CHESS

Among new outlets for arc- An electrical "Brain' with close

four hundred welding technique in Australia is on

thousand railway for logging trucks. thoughts' has been built by scien- This track is being used by the tists at an English nerve hospital Australian Pulp and Paper Mills Known as

Homeostat the In- of Burnie, Tasmania, for the vention consists of four simple haulage of logs to its mills for magnets connected, magnets eling paper manufacturing purposes. together, When anything upsets The design of the railway tracks the balance of the magnets, the comprises bogie frames of cast machine can use combinations of steel, and an all-welded main 27 electrical circuits to restore frame, built on the box-girder balance. This means it principle, from inch and inch choose three hundred ninety thou- mild steel plate. În order to avoid sand six-hundred twentyfive,me- distortion fleet Allot welding was thods to defeat whatever is try- employed in the technique. The ing to destroy its balance. main frame of the track is built Dr. William Ross Asliby Inven- in four sections. The chief tea- tor of 'Homeostat' claims that if tures of the general design are the principle of operation were perfect allgament and minimum used 'Brain' many times Jarger of distortion,

It could be losight to play chess.

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PD. 10