1929-07-18 — Page 10

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CANADIAN PACIFIC

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GEAN 8.9. CO., LTE, AND CHUNA MUTUAL 4.8. CO., LTD.

AND

AMERICAN & MANCHURIAN LINE.

(ELLERMAN AND BUCKNALL 8.8, CO., 'DTH, SAILINGS FROM HOŽOKONG

via Suez Canal 5th. Aug. 8.8. "ADRASTUS" Storniers prorbad via Suez Canal or Panama Canal at owners'

option.

Subject to Change without notice

For froichi and particulars apply to:- BUTTERFIELD SWIRE or THE BANK LINE, LTD., HONGKONG. Hongkong & Canton. Jardine Matheson & Co., Ltd., Canton.

N

THE SWEDISH EAST ASIATIC

COMPANY, LIMITED.

BERVICE OF FAST MOTOR VESSELS.

Loofing Direct For

MARSEILLES, ROTTERDAM, AMSTERDAM, TAMBURG,

H.S. "NAGARA"

MV. "AGRA"

AND SCANDINAVIA,

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M.V. “AGRA”.

For further particulara apply to the

GILMAN & CO., LTD.

Hongkong.

M

MESSAGERIES

29th July Agents. G. E. HUYGEN

Cuntob

M

MARITIMES

THE HONGKONG TELEGRAPH.

THURSDAY, JULY 18, 1929.

THE COLONY'S CLAY. Some of the test pleces, however, CONSIGNEES' NOTICE.

had cracked badly, and in all cases there was a strong tendency to

warp.

Earthenware Mixtures..

N. Y. K. LINE

REPORT ON SAMPLES SENT

From EUROPE and STRAITS. BY HE. THE GOVERNOR.

The Steamship

"LYONS MARU” - S A number of test pieces were

having arrived from the above ports, A.Government report just issued

are hereby rives details of an examination of made from each of the earthenwaro Consigares of Cargo focal clay and kaolin samples rent mixtures tabulated below. The uninforind that their Goods are beint to the Imperial Institute by His washed clay used in these experi-landed and placed at their risk in Excellency the Governor of Hongments was ground before use to the Hongkong and Kowloon Whart konst, was required that the pass a sieve having 120 meshes per and Godown Company's Godowns 11. Kowloon, whener delivery may be materials, which had been for

obtained. warded at the request of Dr. R. W.

"The percentage of bases would Brock, Dean of the Faculty of probably be somewhat higher than Applied Selence, University of indicated in the above table, as the British Columbia, should be tested amounts of soda and potash in the as to their suitability for higher-washed and unwashed clay wore

not determined. grade clay products and wares.

The results of the examinations are fully set forth in the paper, from which we take the following:

White Clay.

The sample consisted of 31 lb. of a fairly soft whilish clay, in the form of small lumps. It was of rather poor plasticity when mixed with water.

linear inch.

The mixtures made with the washed clay, worked well on the whed and gave good results when pressed in plaster moulds.

"Those made from the unwashed clay were somewhat less plastic care in moulding was fand niore

necessary than when the washed clay was employed. It was found that the addition of the ball clay, gave a great improvement to the working properties of the mixtures. The fired ware was strong and hard, with one exception. Increas

the firing temperature of test pieces made from that mixture gave no improvement in strength, hut on the contrary, a tendency of the ware to crack was observed.

Stoneware.

Pottery Trinis, Unwashed clog,--For use in these triala a quantity of the clay was ground to pass a sieve containing 120 meshes per linear fach, 1 was anticed that the material was easy to grind and that no clogging er the mill took pilare, An attempt to mould thin-walled vessels from the ground clay proved unnecess

Impermiable pottery, similar to ful. The clay soing only slightly plastic and having practically no sonrware, was produced from two binding power. The formation of mixtures by increasing the fring pens a less fragile nature by temperature to 1950 C. The total jessing the moist clay in plaster shrinkage of 11.2 per cent. and mould, was somewhat easier, but 11.8 per erat. respectively were not the unfired ware was extremely excessive for a semi-vitrenus body Warg WELK weals and very difficult to handle of this nature. The

and! " It was thought that finer grinding strong

high temperature might possibly improve the work- maturing at a ing properties of the clay, and a could be satisfactorily applied. further quantity of the sample was

China Mixtures. pass steve therefore ground to having 180 meshes per linear inch. Bone-china mistures were made, Trials with his fine material the apwashed clay used in the ex- showed that, although a certain periments being ground to 120 amount of improvement was effech as in the case of the material by this treatment, the clay was used for the earthenware trials. still deficien plasticity and, would not be adapted for mould- ing by the usual methods,

131

felspathic glaze

Red Clay,

I

Goods not cleared by the Bird, July

8, will be subject to reat. Damaged packages must be left in the Gudowys for examination by the Consignee's and the Co's repre- any Tucedays and Fridays, at 2.30 pm, within the free storage Period.

sentatives

All claims must be presented within ten daya of the steamer's arrival here, after which date they cannot be re. cognized.

No claims will be admitted after the goods have left the Godowns,

No Fire Insurance has been elected. - NIPPON YUSEN KAISIJA. Haugkong, July 16, 1929.

work, but with care it was possible to produce fairly good prossed pieces.

Further trials were then inade with a mixture of 90 per cent. clay-4-10 per cent. ball clay, both elays being previously ground la pass a 100-mesh sieve. The addi- tion of ball clay effected a great improvement, and this mixture worked well on the whed, it, being possible to mould small thin-walled; vessels with ease.

Summary and Conclusion,

ta) White Clay,

Good earthenware can be muđu from the washed clay, with or with out the addition of ball clay, but this latter material, renders the earthenware mixture rather more easy to work. I appears unlikely that the use of the unwashed clay for earthenware mixtures would be commercially possible owing to its tendency La crack and to the pre- sence of surface defects caused by ferruginous particles,

Bone china may also be made! This sample consisted of 59 b. fum this material, the adasi, sue- Washed ebay. A quantity of the

moderately hard, reddishessful mixture employed being raw clay was ugly crushed toofa

clay and bail 'elay, a strong biscuit abu" mesh, and then Wunged brown nettled clay, only slightly one that included both the washed in a laboratory washing mill with plastic when mixed with water.

A iminary waslling test off god egtour being produced. about five times its weight of water

(b) Red Clay.

This clay, owing to its colur, is not adapted for many of the pur- puses to which a white clay can be applied.

On Bednet. of the comparatively the red clay showed that it contain. Bis nature of the impurities coned alut 25 per cent, of clay and toned in the raw clay, It was found 75 per gent, of residue, the latter nepossary. In order to ensure that apparently consisting of indurated The impurities were throughly clay, generally of a pink colene, ja fed from clay, to reduce the rate view of the small amount of plastle

The results of the experimenta af How of the day and water enter-elay contained in this sample, and ine the blunger below that which the comparatively low price of carried out indicate that good Could be successfully employed ferra cotta ware, it was DSL con- | second-grado pottery of a light torra | v. wharu washing a crude kaolin, sittered that it would be yeonomical rotta colour can be produced from After having the hunger the shipy practicable to refine the red clay mixtures of the finely-ground clay allowed to settle and they washing. No tests were there with ball clay, and that by increas

can be separation of clay from the more curried out with the washeding the firing temperature, dark purities was thereby effected. It material obtainable from this clay. I brown impermeable ware wa- found that this separation was what difficult on account of the line state of division of the clavey particles.

Was

The results obtained from this 1 showed that the crise materia viddded 56,6 per cent of clay, and 41.1 per et ut of residue.

The cul-ur of the day, moreover, made. renders it unsuitable for use in post quality earthenware or chind mixtures, and for that reason also earried out in this tests were direction.

Pottery Trials,

The wa-her clay was of a fairly- The clay used in the tests was good texture androllur, Dough noter and to pass a slove containing dead white. It worked well in all co meshes per linear inch, but at the test ti which it was submitted, apta le mould this material by The reinter consisted mainly of ghs of the jigger and jolley kaolinized telspar f life chine

wartz.

a

If it were found necessary, the composition of the body could be varied by the addition of materials, such as flint, Cornish stone, or felspar,

#l but as satisfactory arthenware was made by the ad- dition of ball clay alone, it was not considered necessary, at this stage, to carry out more extensive experi- meats,

(a) and (b).

were successful, the The white and red clays, generally, regarded as clay being practically devoid of speaking, cannot be The difference inda tirity nil possessing very little high-quality raw materials. The washing a binding power. In order to deter-white clay yields en

one whether finer prinding would material resembling kaulin, from earthenware can be pr ve the properties of the clay which sound

| chemical composition between the wshed and unwashed materials, but there was a ensiderable dif- ference in their physical charge ferifies, the washed material being very much, more plastic.

a

iev

a further quantity of the material male, and lower-grade ware can be a 100-mesh produced from the red clay, but the round 19 pass

difficulties of working were such that economic manufacture on a

am- commercial seate might be marticable, and it would be neces sary for preliminary large-scale tests to be carried out.

Vesels made from the meal wash- It found, however, that al- ed clay, after being fired to a tem- tagh a roasiderable improvement prature of 1060 C. for 6. hours, In the working properties of the were strong and of a fairly good thy had been elected it was still eol ur and free from "iron spots." Barking in plasticity and difficult to

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