1931-05-02 — Page 2

1

Use Green Island Cement

for

Constructural Work of Every Description.

HOW GREEN ISLAND CEMENT IS MADE

Green Island Cement is manufactured from hard limestone and clay, It is necessary that these materials should be finely ground in order that they may come into intimate contact with one another in the burning process.

The finely pulverised materials are mixed in a certain definite proportion, roughly one part of clay to three of limestone, and are fed to the Rotary Kilns:

In these kilns they meet the hot gases and flames generated by pulverised coal blown in at the other end of the kilns, and after various chemical actions have taken place, they combine to form Portland Cement Clinker.

The Clinker is ground down with a small percentage of gypsum to regulate the setting time, and Green Island Portland Cement is thus produced.

Although sounding so siniple, in reality the process is an intricate combination of mechanical, physical and chemical operations, needing great skill and care. Nothing but constant and accurate supervision will yield the results so well-known with Green Island Cement, namely, strength, uniformity and reliability.

USE GREEN ISLAND CEMENT

Issued by the

GREEN ISLAND CEMENT CO., LTD.

2ND FLOOR,

EXCHANGE BUILDING.

EVERYTHING

The

GE.C. ELECTRICAL

vour guarantee

COSIER FIRES

FOR COSY HOMES

ELECTRIC

Magnet

An example from the

complete range of Magnet Household Electric Appliances Irons Kettles Toesters, Cleaners Fans Fires Washing Machines Cockers, Grillers. Appliances for the Toilet etc'

·MADE IN ENGLAND by

FIRES

THE GENERAL ELECTRIC

CO. LTD.

Magnet

Fire

Current consumption 1 or xi unit en hour. Finished in brown, blue, green, grey or white vitreous enamel.

Sold by all

eating Electrical

Déaléři, Sterat, s16.

HONG KONG DAILY PRESS, SATURDAY, MAY 2, 1931.

ENGINEERING

AND BUILDING

WUCHANG WATERWORKS SCHEME."

TO DISTRIBUTE 41 MILLION GALLONS A DAY,

MOST MODERN PUMPING AND

FILTERING. MACHINERY.

Where the health of the com

which can be done in three hours.

Chlorine can be obtained through the process of electrolysis of com- mon salt (NaCl), Chlorine will be put in the tube and then connect it ta. the water pipes.

JAPANESE STEEL FOR SIAMESE RAILWAYS.

Each year the Government rail- ways of Siam call for tenders for the supply of steel, which are open to all steel makers, and during the

WATER-TUBE BOILERS IN MERCHANT SHIPS.

RECENT P. & O. LINERS CITED.

A table included in a paper read

past three years, the Japanesey Mr. Harold E. Yarrow at the Spring Meetings of the Institution Bridge Builders' Association of Naval Architects enumerated a through its agents, the Mitsui score of merchant vessels in which The alum house will comprise of Bussan Kaisha, Bangkok Branch, Yarrow water-tube boilers have been three storeys built in reinforced

or are being installed, and gave.. has submitted estimate. In two

particulars of the heating surface, Various machinery will he installed far melting, mixing,

successive years the French were the total evaporation, the evapora and measuring the alum. A small successful. News has just been re- tion per square foot of generating dose of this coagulant will be addceived that this year the Japanese surface, the total weight with

concreto.

to the water before it passes into the settling tanks,

eite of the paper factory nt Pesha munity depends to a large extent show. The raw water is pumped, upon the purity of water which is through the intake pipes, to the consumed by the public, and where mixing channel, from which the disease is prevalent during the water flows slowly through the

Settling Tanks. greater part of the year among sedimentation basin where a large

The capacity of the reinforced people who live and dió în the con- I percentage of matter in suspension Rested area of the City of Wuchang, settles down. The partially clarifi ttling tanks will be over 23,000 it is a difficult matter, indeed, toed water flown from the sedimenta-eight tanks, which will be separat gallons. There will be altogether have pure water for the whole of tion basin to the rapid gravityed from each other by water proof the year without an efficient device | filtern whère, all remaining matte: walls. The velocity of flow will be of water purification. The present in suspension, including bacteria, decreased to two feet per minute by population of Wuchang is slightly is removed. The water from each in excess of 300,000 according to the latest census of the Wachang Public Safety Bureau. The water supply

of the inhabitants has been obtain ed from such sources as catials with in the city, tributary streams to Yangtze river, and shallow wells, The water is distributed to the con-

sumers chiefly by men who carry two buckets of water swung from each end of bamboo rod, which rests on a shoulder of the carrier.

During the past few years, there have been two big attempts to promote a waterworks company, but none were successful. The chief

Causes for lack of success него

fifter flows to its special chamber the zigzag wall built in the tanks, in the regulater house, where the as it is said that the water flows rate of filtration is controlled. It slower, the impurities settles down quicker. The silt will settle as the

wator travels and will be collected in pockets from which it is pump-

then flows to the clean water re servoir. High lift punips take the filtered water to the elevated re servoir on the top of Snake Hilled by a mud pump while the tank

are in action. This avoids the en- or Sheshan; and through the pipe forced laying off of tanks for clean- system, the public and private sering twice or thrice a year and also vices and fire hydrants are con- nected.

:

Waterworks Yards.

The waterworks yards will be advantageously situated on the old site of the paper factory, which has an area of more than 4,800 square feet. The velocity of the flow of the Yangtze water at that point

increases the capacity of the tanks from the settlement point of view by about five times.

Filter Bod

After remaining in the settling tanks for a sufficiently long period for the suspended matter to be de posited the water is drawn off from two feet below the surface by float-

tender is the lowest and the fact

water, the total area of boiler room, the evaporation per ton weight, and the evaporation per square foot of area.

He pointed out that many factors

of this success in open competition with the world's steel, makers has caused no little clation in Japan, the Minister of State for Railways, influence the design of a boiler Dr. Egi, adding his "congratulations on evaporation per ton weight and installation, and all have a bearing

and speaking hopefully of Japan's per square foot of total boiler-room future prospects in the world mar area. Thus a vessel may have a

tive to area, which necessitates the kot. The Japanese bid was suc. boiler room of small height rela- boilers being low and wide, and for cessful against some of forty com-

a given rating tends to reduce the petitors of Belgian, Czecho-Slova kinn, French, German, American evaporation per square foot of floor and British nationality. The con- space. In regard to evaporation tract is for the supply of 300 tons per square foot of floor space. la of steel for new construction and regard to evaporation per

weight working pressures replacement-plate girders, lattico the thickness of pressure parts, girders, culverts, etc. Mitsui's bid and therefore weight, together with was not less than Yen 100 per ton the method of construction, inter- acts in this respect. -Boilers that delivered in Bangkok. A German

must occupy a small floor area are hid was second lowest. American made of greater height and requiro require heavier, supporting strue- bids were highest.

4.

ton

govern

The Government Steel Works in ture, as in the P.&O. liners Strathnaver and Strathaird. Space. Kyushu will supply the steel, which and weight are also largely affect will pass Japanese Government

severe. While there will be but small profit in this, the first, Japan ese contract for the supply of steel

ed by rating and overall efficiency; figures in the table for a modern cruiser and destroyer show how a water-tube boiler can be forced without risk, continuously at nor- mal load, when output is the first

diffealty for raising capital and sudden changes in local government. In most cases the leading govern is comparatively slower than other ing pipes, and pumped to the railway specifications, which are ment official was an important mom parts of Wuchang. The position filters. A battery of eight reinfore her of the proposed company, and his of the waterworks is again favoured concrete. rapid gravity filters, disposal from office and disturbeded by its close neighbour, the rail-each stowing two and one half feet conditions made it impossible to way station, which will undoubted thickness of filtering sand. and continue. This is about the thirdly help the waterworks to save a filteen inches thickness of small to a foreign government it will be consideration, the hourly evaporn- time that the Wuchang waterworks big amount of money for the trans-rocke, will be constructed. Ench of advertising value. Railway en-tion in the craiser being asalb. per- scheme has been revived, and now portation of machine parts, fuel will have a filtering area of

330 gineering in Japan has come much 9. ft. of flour area, against values ranging from 79b, downwards for thero. seems to be rather more and other geossary materials.

square feet, and in all 2,689 square to the fore in the past year. Her merchant ships. The advantage of chance of its success than has

fect. The process of filtration will previously been the case. A capital

be downward through the sand and engineers are busy in the railway large units, from the point of view The water supply of Wachang rock layers, average rate of filtra-shops of Moscow and other Russian of floor area, is shown by the fact ed and then perhaps things will has been obtained, as stated above tion being about 06 gallons per centres, and a Japanese has been that in the Strathnaver, having

from springs, lakes, wells and river.square foot per hour. Then the The inception of the present pro. But the lakes are often silted up total for the eight bods in action engaged by the Persian Govern- an hour, the evaporation per square

of about $1,000,000 is to be subscrib-

mave.

Bource.

four boilers evaporating 275,000lb.

ment as railway adviser. The foot of floor area is over 60 per

India, which has six boilers evapor. nting 180,000lb. an hour.

jeet is largely due to Mr. H. Cer contaminated by sewerage, and will be 230,018 gallons per hour, Ling, the technical expert of the the wells are apt to run dry dur- and one whole day will filter over Siamese deal will be so handled as cent, greater than in the Viceroy of Wachang Bureau of Public Works. ing the autumn He submitted proposals for the or ganization of Waterworks Prepara. tory Commission, in which he him self is the chief engineer.

The following preliminary Bur veys have been completed by the Commissioni-

Benson, It is,217,152 gallons. The filter beds

to enhance the reputation of the therefore, most reliable for the will be scraped in the usual way

island empire of the east, which is waterworks to derive the intake by hand, the average time between from Yangtaze River.' It is said scraping being about 10 days. The making a name for itself in a de that the yellowish Yangtare water dirty sand will be washed either partment of activity hitherto con contains certain amount of sand,ly hand in boxes or by sand“wash-

fined to a few Western nations, which has the property to helping machine driven hydraulically

whose one-time monopoly in so sedimentation and kill bacteria, y pressure water from the mains. The width of the river has also en. These filters, which occupy only five many branches of engineering is

led the sun to shine continuously per cent. of the area required by now at an end-The Engineer. on it and thus oxidize the water, slow sand filter beds, have thirty 2. To survey the two areas in which removes all impurities and times the expneity por square feet

Prrhachow and Kashihying insecte. If this water is again for the future sites of water chemically purified, there is every intake and distributing main.

1. To estimate of the quantity of rain and the flowing velo- sity of Yangtze river.

3. To decide the powers of the "eason to believe that all water sup- varkus machinery and the plied will be potable and patho sizes and length of various genically safe. pipes.

4. To estimate the total costs of the machinery and construc- tion...

The Pumphausa.

The motor pumping house consists two electric driven pumping motors, to which two pipes are con- 6. To draft the rules for the nected with one to the mixing

5. To decide the network of dis

tributing pipes.

issus of the waterworks bonds.diannel, and other end at the

take, reservoir, motor room

eter, etc..

of area. this increased filtration perty owners., Públic hydrants will rate being obtained by washing le every

twenty-four hours with pressure water in the reverse direc tion to which filtration takes place, the mud collected by Altration' thus being separated from the Altering materials and run to waste.

Clean Water Roservoir,

From the filters, the water flows to the clean water reservoir, which

in

Rajputana and Viceroy of India. The Rajputan. the installation which is representative of modern Scotch boiler practice, and' the Viceroy of India offer an in- "

the teresting comparison from boiler point of view. Although the latter is of about 1,600 h.p. greater power, the former requires 50,000lb. more steam an hour, her boiler installed in the residential efficiency, stenm pressure, and

quarters of poor and labour clase,

steam temperature being lower and her engine efficiency loss. Six natives per watch are required to look after the Rajputana's Scotch. boilers, against four per watch in the Viceroy of India. Because of the better layout given by the The proposed Wuchang waler-

larger boiler units it is anticipated works will be able to distribute that only three natives per watch 4,500,000 gallons a day. Take one will be required for the boilers in

and water will be sold in retail at the price of one cent per pical Both private and public servicez

will be metered.

7. To draft the rules of managedimentation basin. One portable was proposed to be also constracted half of the total filtered water to be the Strathnaver and Strathaird,

ment during the period of,

it will be installed to transport in reinforced concrete. The water sold and take eighty cents as the although the power is 60 per cent. construction. To draft the various plans for all the necessary machinery. This will be taken out from the clean price per thousand gallons, its daily greater than in the Viceroy of B. the construction of the in-house will have one air compressor water reservoir through pipes system and slectricity transformer in ad- to the high lifted tank at Sheahan dition. The slectricity used in the by two powerful pumps driven by house will be supplied by the power suction gas engines. These two four house. Like in the mixing channel, cylinder engines will be installed steel-ladder will also be installed in the elenu water engine house not in this house.

only to drive the pumps but also to generate two dynamos, which serves to be the sale supplier of electrical

All the funds for construction work are to be obtained from the sale of waterworks bonds. A total issue of $1,500,000 has been decided in the draft.

The bonds will hear interest at

the rate of eight per cent per din nam, payable semi-annually.

:

Sedimentation Basin,

and

The sedimentation basin will be light and power of the waterworks

yards. It built in reinforced concrete. In planning the Wuchang wateṛ.

The discharging capacity of this works, due account was taken of has the storage expacity of 2,000,000 likely future derauds and a genorai gallons of water, and it will be proposed waterworks will be at divided into six parte. Every part

180,000 gallons per minuta scheme for future development or a

will be separated by water proof,500,000 gallons per day. Fifteen master plan was drawn up. Due to a number of causes, the initial walls and connected with pines, gallons of water aro estimated as works were designed as sinali and as every end of which is regulated by the daily consumption per capita. cheap as possible.

Water Service.

income will be $1,800 or $54,00 India. monthly. If the demand of water in Wachang will be increased t three million gallons a

day, the income will jump to 82,100 a day or $75,000 a month.

According to the above estimate, FILL YOUR FOUNTAIN PEN the balance of the waterworks' ac- counts will be exceedingly proft. able: At least the waterworks wil

gain a net profit of 836,000 a month.

If the later estimate is correct, its net profit will be promoted to 2,000 instead of the above amount Considering 81,200,000 of capital un have 836,000 of monthly profit or

and write . Chit to

11. Ice House Street

BEFORE YOU SAYL

and order the Weekly. Press to be sent

you Overseas. It conta

a yearly surplus of $432,000, or the automatic stepper. More than

interest over 36 per cent. per an 6,000,000 gallons of water will be

num, there is every reason to be distributed from this basin. The It is said that the filter water lieve that the city of Wuchung will The equipment of the hydraulic flowing capacity will be 4,000 will be absolutely odorless, color-be developed and the business of the $4.50 FOR THREE MONTHS.

General ProCESS,

machines will includs the most up-gallons per minute and its velocity | lesa, tasteless and no bacteria; waterworks will be prosperous, $9.00 FOR SIX MONTHS, to-date devices for pumping and of three feet a minute. The time that it will be drinkable even with should. the adininistrativo authority Gitration generally used in moder: for settling of the impurities will cut boiling. Private service will practice. Two intake pipes are tole three hours. Every part of the be set as fast as requested by pro: be located on the bank of the old tank can be closed up dor washing, | (Continued at fell of next column.) "Review.

make good use of the surplus-Ur. $18.00 FOR A YEAR. Y--Cam Yves in Far Eastern