Page
THE EXPRESS LIFT CO., LTD.
WITH WHICH 18 INGORPORATED THE BUSINESS OF
\SMITH, MAJOR & STEVENS, LTD./
EXPRESS SMS
LIFTS
MODERN LIFTS
FOR MODERN BUILDINGS
SPEEDY RELIABLE SERVICE
FOR DETAILS APPLY TO
THE G.E.C., QUEEN'S BUILDING, CHATER ROAD."
The
EVERYTHING (SE.C.) ELECTRICAL
FOR YOUR WALLS
L. AtkinsCE
Members of thGKA
HONG KONG DAILY PRESS, SATURDAY, APRIL 9,
ENGINEERING AND
"FATHER OF ALLOY WATER PUMPING
STEELS."
FARADAY'S WORK.
The recent ravelation of: Fara- day's considerable work and inter est in the subject of steel doubtless came as a surprise to many metal-i lurgists and others who were in timate with the industrial develop ments of other aspects of the great scientist's original investigationa,
||
PLANT.
THE DIESEL DRIVE.
1932.
BUILDING
AUSTRALIAN “ TIMBER FOR WHARF CONSTRUCTION.
TO BE USED AT FALMOUTH DOCKS.
INCREASING APPLI-formers of special design, whịch constitute an integral part of the CATION OF RESIST-
welding, not. This current in then applied by convenient electrodes: to ANCE WELDING.
the accurely clamped pieces of motal to be welded
CREATER SPEED, AND EASE OF MANIPULATION.
BY AN ENGINEERING CORRESPONDENT.
It is now over fifty years since
Elihu Thomson Arst demonstrated
In spot welding the bottom ales- trode is usually fixed, while the top' is movable by means of a pedal at.. tachment. The almost momentary application of the current affects the weld, and these can to made in succession as a rapid rate.
By the substitution of a type of In a paper recently read to the Diesel Engine. Users Association,
the possibilities of electric welding roller for the pointed electrode, Mr. C. W. Cassé gavo ample evi,
by means of the heat created at the seam welding is similarly accomp The decision of the Falmouth Junction of two metals which form ishod; while in butt welding the dence of the applicability, of the Diesel engine to waterworks and Docks and Engineering Company toed part of an slectric circuit. The pieces of metal of approximately other pumping plant. This is no employ Australian timber in the resistance of the poor Junction con- the satas section are firmly clamped verts electric energy into heat, within oloss, contact, the surfaces hav- new departure in oil engineering, construction of a new deep-water
local softening of the metal wolding first been cleaned from scale For a century the story lay hid-as in one example.quote, a Diesel. den in a simple box containing some/engine had, heen in operation on wharf will be received with intaresting being completed by the applica and cut square. this type of service for no fewer by harbour engineers and dock tion of pressure. than twenty-nine years, and was authorities in England. Briefly, the still giving results comparable with those for engines of more modern
seventy-eight specimens of steel made by Faraday, labelled in his own handwriting and set aside, doubt less, till a more convenient 9656011. We are indebted to Sir Robert A...
Hadfield for his initiative in ob taining the consent of the managers
date.
" 15
SPOT WELDING. Bince that time there has been a considerable development by means The processes of spot welding bave cheme involves the building of a
of the arc process, the local heat within the past few years boen wharf 600 ft. long and having being generated in an are between brought to, a fine and rapid art, 'and' Agreeably to the general practice depth of water alongside of 28 ft. the motnis to be welded and a oarmashines are available to-day which of reliability in water-pumping at low tide. Some years ago piles bon rod which, in later years, was accomplish as many as 2,400 spots plant; many heavy-oil engines had
[quired composition and in some metal, while, machines for heavier Jux-forming types of work have been produced. which give an equivalent rate of While the are process haa, a wide production Spot welding offers ad-
speed variation in the angine ia de- sirable, and this, to the extent of
marina boring pests, the piles had
of the Royal Institution to make. found their way into pumping imported from Portland, Oregon, replaced by a steel rod of any roper hour in the lighter gauges of
stations, being didapted to the sover-U.S.A., were employed on other casos covered by al types of pumpa at present in usa works at Falmouth, but, owing to material. for this purpose.
the ravages caused by the Teredo For reciprocating pumps Rome Navalis, Limnoria, and other subrango of application, the original vantages over riveting in the simp principle of Thomson has provided licity and speed of the operation, the basis of many advances in eles and also in the fact that there is tric welding, and to day the process no occasion for previous marking 5 per cent, above to 20 par cant bo-to-be renewed every 8 or 10 years.
is gaining ground, by reason of its out and punching or drilling rivet Careful Tests, low normal, is easily obtainable on.
rapidity of operation and the fact holes. Further, there is no doubt Diesel engines by governor control.
that in several forms it can be about the strength of the job, which Prolonged and exhaustive tests With this type of pump, mechanical
effectively carried out automatically is also free from the possibility of efficiency goes with low speeds, and wore accordingly carried out on
With the resistance method the loosening due to vibration. hence some type of speed reduction other timbors, notably turpentine electrical characteristics are low A surprisingly small consump- This tion of power is required when it is necessary.
(Dushinurd, on-Page: 3.)
thorough examination of thes and others of Faraday's steel specimens. This work, carried out with characteristic thoroughness, Was published in a paper before the Roy- al Society in September last, and has now been described in greater detail by the publication of "Fara day and his Metallurgical Resear ches," Chapman and Hall, Els not.
The magnitude of the past is partly revented by the very large number of analyses carried out and supplemented by physical and me chanical tests, and this with the use of ho more material than a little over a pound, taken from, the
Centrifugal Pumpe.
hardwoods imported from Australia.voltage and high currents... The results obtained exceeded all type of current necessitates trans- expectations, and it having been
whole of the specimens. In the au- Centrifugal pumps are now, on! there hands these small amounts account of low capital cost, replay computed that an Australian tur- of materials are made to revealing reciprocating pumps, and vast pentine wood pile would have a life
Faraday's insight into the realm: progress has been made during the of about 40 years, the company de Use Green Island Cement
of ferrous metallurgy and the pione ering work in steel, which amply justify the appellation of "The Fa ther of Alloy Steels" to Faraday..
The volume is assured of a per- manent place in the literature "ol motallurgy and in the world of en gineering, so dependent upon alloy
steels.
specify
Berger Paints Varnishes &
Enamals · Distempere · lacquers
(760
PARTICULARS AND COLOUR FOLDERS
from
OIL-BOUND DISTEMPER
Matroil
W. R. LOXLEY & CO.
COMPLETE ELECTRICAL INSTALLATIONS.
with
C. M. A. CABLES.
Advice and Estimates given
free on all
types of
LIGHTING & POWER INSTALLATION
1
by an experienced
ELECTRICAL ENGINEER
retained at our Hong Kong Branch -
The General Electric Co. (of China), Ltd.
QUEEN'S BUILDINGS,
HONG' KONG
past twenty years in this direction. 'cided to employ this timber when Their speeds vary from 500 to 3,000
the construction of the new deep- r.p.m., and unless high-speed en- †
3:35
gines are used. there is the necessity water wharf was embarked upon, for speed-increasing gear. With An order for Queensland turpen- high-speed engine drive the engine
tine wood piles and other Empire may be directly coupled to the pump or through a gear of small ratio. timbers, valued at 30,000, The centrifugal pump has the ad therefore placed, and as a result the vantage of even torque with Jens
1.8. Belpareil left Brisbane bound mechanical shockt on the engine.
for Falmouth, in December last, with a carge of a350 turpentine wood
Where low-speed engines are used there is the need for speed-increas
consignment was between 4,000 and
ing gear, which may take the form piles, varying in length from 79.to of either belts or gears. The ratio 73 ft., and weighing as much as 8 may be as grunt as 38 to 1 reduction, tons each; the weight of the whali or 1 to 1 increasing Each case; obviously requires special attention, ¡
In the old-fashioned type of gear 3,000 tons. She also carried. 104,000 a train of uncut cast-iron spur superficial feet of sawn brush box, gear-wheels Wat employed, and
which will be employed for decking usually run dry, or with very little
the whari throughout. About 4 grease Lubricant. The accompany-third of the piles and the whole of ing noise has now been entirely the decking consisted of Queensland timber, the remainder of the piles cut gears running totally enclosed coming from other parts of Aus- and oil lubricated.
tralia The Belpareil arrived at Modern practice as discarded the Falmouth last month and discharg- oil bath, and employs forced sprayed her cargo at the docks.
eliminated by the use of machine-
With gears of this type efficiencies
of 90 to 99 per cent, are realised. Sometimes Both belt and gear are used to obtain the necessary change,
"Empire. Wharf."
As all the materials entering into
but this mixed system has a much, the construction of the new wharf
lower mechanical efficiency.
In modern plant bevel gears are i largely employed thus getting over
1
i
have been produced within the British Empire--the cross ties and beams, for instance, are from Van-
the difficulty of driving at right couver, Canada-it will be known as angles. Whore bolt drives are used; the Empire Whart. It will be the transmission efficiency can only equipped with bleoric cranes and will be utilised at times for din. range between 75 and 80 per cent, while an allowance of 2 per cent, charging cargo, but more generally for ship must be made in calculating for the carrying put of repairs to liners and large oil-carrying vessels. pulley diameter.
It is to be hoped that the present While cotton ropes are not used
shipment from Austrália, although to any great extent, a new type of
not the first of its kind, will be the rope with a rubber of leather cum forerunner of othera, and that our position is available with a slip dock and harbour suthorities will amounting to only from 0.75 to 10, look to an-increasing extent to the per cents and an efficiency of 50 to Empire for their applies of hard- £5 per cent.
woods-ngineering.
PAINT INSULATION.
paint as used generally through- out the system, and the other with aluminium paint.
A number of comprehensive tests havo' been carried out recently with It was shown, beyond doubt that a view to ascertaining the inaulst the metallic paint, by refracting ing values of aluminium paints us outside bent, permitted the inside applied to refrigerating cars in rail- temperature to be kept at Tower way service. Two new cars of the degrees with less frequent replacs. divided basket-bunker type wers menter of ich The readings word treated, the one with the ordinary taken on both cars with electrical (Continued at foot of next solumn.) resistance thermometera.
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 simple, 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.