Pale A
TILE CHINA" MAIL, THUHS DAY, SEPTEMBER 2, 1948. **
ARNHOLD & CO., LTD.
HOLLAND HOUSE
HONG KONG
SA830ON HOUSE
JACENTS FOR....
SHANGHAI
BRITISH OIL ENGINES (EXPORT) LTD.
PETTER FIELDING
10.80 B.H.P. HORIZONTAL
MEDIUM SPEED
COLD STARTING
OIL ENGINES.
STOCKS NOW ON THE WATER DUE
EARLY SEPTEMBER
WE ARE ALSO IN THE POSITION TO SUPPLY FOR PROMPT SHIPMENT
VICTORIA CONCRETE MIXERS
7/5,
82/6,
10/7, 14/10
Capacity
MANUFACTURED BY:
STOTHERT & PITT, LTD., BATH.
ARNHOLD & CO., LTD.
HIDE THOSE WIRES
"
by using
"GILFLEX"
in all your
New Building Programmes.
Instruct your contractors to
quote for this
new method of
concealing wiring
the safe and
cheap way.
EARLY
DELIVERIES
ASSURED
ENGINEERING PAGE
HIGH SENSITIVITY IN
NEW TESTING MACHINES
The term "eing machines" comprises alt devices for testing the features of raw and somal- | Balshed | natérkuls us well as Anished products prior to and after the manufacturing process, Testing machines are, therefore, mainly employed in laboratories for testing and developing of Fay materials as well
In n
variety of Industries for the con- tinuous control of the incoming materials as well as semi-finish- el and finished products. There la hurdly any material
which cannot be tested by mechontent testing machines. Silence and
practical engineering have long came to the canelusion that text- un machines ure of vita! im- potfance for achnient develop-
ment.
The Essentials
A good testing machine musi not only be accurately calibrated I must also be designed and constructed inch
manner
that frequent and prolonged use sires not affect the accuracy of
Dent in extensive use,
Fig. 2 AMSLER Universal Testing
Machine 20 tons
For
Fig. 3 50 tons Pulsating Equip- ment, 50 tons Tenslie, Compres xion and Transverse Testing Mar- line for static and dynamic texts, equipped with Pulsator, Pin- dulum Dynamometer and Purp. Transverse prulaution test,
and
sliding
weight. The depths of the im- pression produced are (contrary that to the old types heavy loaris hardness testers) so small that the test pieces are not damaged. The apparatus is suitable for use
on thick and hardened pieces us
lond neumiyent:4px}. In other wards.
the calibration of a good resting machine, must be based sulely upon factors which cannot undergo any changes because of weer and fear of the mechanism Jaguinst damage that may result
incorrect operation. and as the result of heavy jerks from which always
when necur
instance, the machine or any of equal degree of sensitiveness and which can be locked at any de- specimen breaks under tml. its parts should not be damaged jner uracy, a good testing machine stred height. Laude from 10 to The entire machine must be so it the movable crosshend is should possess a large number of 40 kgm. can be applied by means constructed that it will preserve forced bgainst the stationery sele
selective sensit.vineys ranges. of weight riks est only the accuracy of calibra-head or the bottom table, and The addition of such ranges, tion but will also protect all its the movement is not stopped in rach from 0 to 1. 1/5, 1/10 of elements in such a manner that time by the operator. It speel the maximum
to range, they will not break or become men in a compression test is not equal to its rated full capacity,
A good correctly centered when the loud has been found thoroughly prag testing machine should contain Is
fain is applied, he columns
ns of the tirul and exceedingly useful. as few cust parts as possible be-machine should not become bent. A Cause castings connot withstand In a good testing machine, the nod testing machine should nut be limited to 6 definite num- indefinitely the rurressive shocks loads applied should always beber of speeds but should have produced in the entire structure automatically counterbalanced by valiable an infinite number of when the plects break.
the load measuring mechanism, testing speeds, from the very Every good tesling
machine during the entire duration of the lowest to the utmost rapid. must be automatically protected test, right up 10 the Instance of
order to Fe of val
value in fracture of the specimen. The many important tests and investi- method which employs the bal-entions, a good
good festing
machine aneing of a horizontal beam be- must be constructed in such a tween the upper and lower bars manner that it permits the au- Yomatic maintenance of any de- sired delinite load, within its tated capacity, for any desired
indeperitently of period formation of the specimen dur- that period. Such an ar- runzement is particularly im- portant, in high te
temperature A good machine designed for compression
Ө
GILFLEX
TRADE
ELECTRICAL INSTALLATIONS,
with
GILFLEX
FLEXIBLE NON-METALLIC ..
CONDUITS
for the rapid and economical electrification of post-war building schemes.
plaster or concrete at lower cost than steel conduit.
MARK
GILFLEX'exible non-metallic tubing permite wiring to be buried in 'GILFLEX'' accurately dimensioned to give a push-on fit into switch boxes and other--fittings, no-threading being - necessary. 'GILFLEX' being non-metallic is unaffected by damp conditions 'GILFLEX' is non-inflammable.
'GILFLEX'
dees condensation take place in the tubes,
polther
has been thoroughly tested and approved for all types of wiring in Hong Kong by both.
1. The Hong Kong Electrio Co., Ltd.,, and
2. The China-Light-and-Power Cou ̈ £10,
For Further Particulare Apply:-
Bole Agents
J. M. SHASHOUA (H.K.) LTD.,
1st Floor, Glgunester Dúllding.
Tel. 22615.
static, tensile end
tests should be constructed
tests.
such a manner that it may also
be readily used for tests under
HAUSER
rapidly repeated stresses, In Fig. I "HAUSER" 'Optical Hard- which it should permit an ac- ness Tester "Micro-Durometer": curate measurement of the loucts,
of the speed and number of well as thin and
delicate ma-
stress cycles applied and a wide terials such as sheet metal right range of adjustment of
these
down to 0.004" (0.10 mum.) thick- conditions. The investigation of ness.
the strength of materials under “Universal-Testing-Machines-for- rapidly repeated stresses is con- compression, tensile, transverse, stantly gaining in importance, and cold bend tests as per Figure No. 2. Such machines are avail- There is no reason why a good testing machine should not be able for capacities from a small used for tensile and compression fraction of s ton up to several tests
to fracture by applying hundred tons. either
The world's best known make one gradually increased load or a number of rapidly re-
"AMSLER" Universal Testing are designed on the Machines
peated stresses, until fracture oc- curs or until a definite degree of deformation of the specimen is obtained.
]]
ro-
Only one operator should be required to perform a complete tensile test, including the produc- The tion of stress-strain curve. specimen should be readily ac- cessible during the test, from all sides of the machine.
The
grips of the machine should be con- structed for rapid insertion of the specimens and for quick and casy removal of the fragments.
Light weight of the machines, in proportion to capacity, is also an important factor. The quired absorption of
heavy shocks in testing can be effected by more modern and satisfactory means than by the use of heavy masses.
well construcied testing machine should be light of a "beam gats" with resulting of weight, in proportion to Osellintons and production of forces which it is eble to develop. stresses in the specimen which should not require are not indicated, is too crude foundations. It should be possl- to be applied in any up-to-date ble to install the machine upon laboratory, In & well-construct- any ordinary offee or laboratory ed testing machine the loud mea- door, even in an upper-storey of suring beam must not oscillate building. between 2 limit
positions, but All parts
of a good tealing ma- should freely and. automatically
should chine
be strictly inter- follow any increase or decrease changeable, of sturdy construc-
AMSLER Rapid Tensile Testing Machine, Copacity 1 to 5,000 kg.
special
of load witho producing incrllation and at the same time of the Fig. 5 Amator Pendulum Impact effects and
Testing Machine, arranged for a Cbarpy (Beam) Test.
without requiring finest precision workmanship. iny attention or manipulation on The following 3 are the most the part of the operator.
commonly used in the field of A good testing machine in testing machiner which the loads applied ore au- Hardness Testing
Machiner. hydraulic principle: oll being tomatically balanced during the Next to the old type mechanical used as the world fluid. The entire period of a test without hardness tester, the optical hard-hydraulic ram and cylinder are uscillations of the beam, should ness_tester "Micro-durometer" as precision ground and lupped to produce an accurate and con- per figure No. 1 represents the produce a triclionicss sliding. Ot tinuous stress-sirala curve from latest development of hardness of adequate of Wightness. The zero Toad to fracture of specimen, testers. This optical hardness
machine and load Indiea- without any manipulation or at- tester has been resigned for di- (pendulum dynamometer} tention by the cperator.
rect optical readings of hardhess) are set up as separate units be In order to be able to test both values on Rockwell, C. Vickers side each other. This arrange weak and strong materials, thin and Brinell scales. On this out- ment prevents the shocks which and heavy sections, non-ferrous standing, machine the table is occur; when specimens. fracture, and ferrous specimens, with an mounted on -ilding column being transmitted to the load in
пиши
4. Sinus Bood Graph taken vo se means of an Oscil lograph from a, puteated' test: bár: “
dicator, thus enpuring the maxi- anium of accurchy,'
"pressure: within the system is measured in tons or pounds, cf actual load by the pendulum dynamometer dial, arranged for several different Jond"čangus so that specimens of very diferent ̧ ́àtrengths can be fented with the ·rime' degree of
accuracy.
(Continued on Page 9)'
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ELECTRICALLY CROSS-WELDED STEEL WIRE MESH IN ROLLS OR SHEETS
APB4
FOR CONCRETE REINFORCEMENT
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