1948-10-28 — Page 6

L. THE CHINA MAIL, THURSDAY, OCTOBER 28, 1948.

ENGINEERING PAGE

PULSATOR GIVES VALUABLE FATIGUE TESTING SERVICE Multitude Of Uses Found For It

What is the idea of. Pulsat-2.1

Ing Testa

Short description of Pulsa.

torn and Tento

Fig, 8: Trans- verse specimens Bre simply pinced between the bending tools,

*PIC; }

FR. 1

For

Fig. 9: compression tests 'the stan- dard comprés- sion tools are used.

Pulsators for Fatigue Taste

of

Specimens Different Thermic Treatment rolled material

Fatigue Texts of

aunealed at 925 C. then rapidly

cooled

annealed at 925 C, then slutly

cooled

overheated to 1176" C

The tensile strength is highest in the case of rolled, inuterial, whlist I folis off in the case of quickly hind slowly cooled annealed speci. mens and reaches the bottom In the case of material, which was overheated. See Ag. 15.

TECALEMIT

THE AUTHORITY ON LUBRICATION Tecalemit, ploneers in the field, today hold the is the largest manufactyțers of Ajitomobile, de and Industrial Lubrication Equipment in Great

AUTOMOTIVE

Automobile Servicing Batteries Hydraulic Hoists,

Air Compressors

Tyre Inflators

Grease Guns and Nipples

INDUSTRIAL

"BIJUR" Automatic Lubricators "BRENTFORD" Automatic Lubricators "LINE-O-MATIC" Automatic Lu

RADIAL Grease Pumps "TECALEMETERS Liquid Measurement,

Enquiries to

SWIRE & MACLAINE LTD.

ENGINEERING DEPARTMENT ICONNAUGHT RD. C.. TEL, 30331.

APRI6.

The Moment You've Installed Your

KRESKY

Oil-Fired*

Hot Water System

{You'll'agree, it's a

Luxurius

Necessity!

*KARSKY

USES NO. 3 GRADE

FUEL-OIL FOR INSTANT HOT SERVICE

Sule Agents;

GILMAN

A & COMPANY, LTD.

Engineering Department

4A. Des Vecux Rd., C. Tel: 31146

Thor

Pample 1 Tulroad: A heavily inated Ruoc-train runs aves the Drank. Ever wheel slight bends) the rail when it passes betyreen The sleepers. The rail thus is: subrireted to a series of constant- ts and rapidly succeeding berting stresses. The rail is not deform- eet permanently, but according to the warmut of trafle, it

{ Jeeled 1. me

fatigue.

Des

sub- heavy

The PULSATOR imitates suchį bending trusses, It

even amplify Bem, and thus deterntine its a short time what material would render the longest and

fent service.

Example 2: Reinforced Concrete Bridge: Trains, carts, cars; lorries [ete, passing over a bridge set up vibrations, more or less heavy, according to the state of the road surface or the weight of the

vehicle.

What concrete composition and what reinforcement will now give The surest service?

tons Fig. 4. "Amsler" 100

Fig. 10: Riveted parts are held Pulsating Equipnient. 100 tops within wedges, Tensile Testing Machine of spvelally high design, for static and dynamic testa, with Pulsatbr, und Pendutin Dynamometar Pump. Pulsation test in tension,

Hydraulle Tasting Machines are used in conjunction' with 'Pulsa- tors (g, 4) and rapidly prokice loud variations of high munitide In full-size test burs and other Jarge specimens inserted in the testing machine,

The load varlations take place between two definite limits set by the operator, and these lojdi imits remain constant during the period of test, incependent of deformations of the test piece during such period.

Welds are

Fig. 11: like plain bars.

28

201

300

PULSATOHS can also be used i for alternate pulsating tests. Such an arrangement permits of producing alternate tensile act compression stresses on this pict that side of the neutral (unloud- ed) condition of the specimen. gripped The four figures 10, graphically Blustrate the different pulsating possibilities.

Pulsating in the positive or in the negative field.

113

Pulsating between zero and one positive or one negutive Joad.

Pulsating between

cqual positive and negative value,

Pulsating between differently high positive and negative values. Agents for "AMSLER" PUL- ner & Co., Ltd., Shanghial.

Fig 12: For Assemblies specia) SATING Equipment: Siver bg-

The pulsating force exerted by the straining cum of the hydrauljc testing machine can be utilised for shackles are made. tapidly repeated stress teste in Tension. Compression or Bending, Va and, depends zolely on the type of testing machine 'and the purilcular nanner of Inserting the fest *piece.

4

4.) Tensile Fatigue Testa

The FULSATOR glves the an-' swer! Concrete beams are sub- The Pulsator is in direct con- jreted to rapidly succeeding nection with the straining cylih- bending stresses, thus imitating) der of the tealing mach specimens are electrically welded („Uie vibrations set up by traffic. through a pipe of large diameter

The specimen is subjected to a pre-tone, identical with the lower limit of the pulsating load. the

sungli duxiliary pumb On "pufaktor-outdinatically pointains

this pre-load.

The adjustment of the upper pdisating load limit is effected pa The large capacity pul-alor by adjusting the stroke of the pulda- tor ram, and on the standard Example 3: Connecting Rods the phases of the connecting rod capacity pulsator by displacing and Connecting Rod Ends. They mechanism.

evidently are subject to constilit |

and quickly changing sizeze verlos tions, How can the best miterlul to withstand such stresses be le termined in the quickest and. surest way" PUESATOR.

Naturally by a 3.) Teat Pieces

PORTABLE POWER TOOLS

PNEUMATIC

UNIVERSAL ELECTRIC

MINING & CONTRACTORS

INDEPENDENT PNEUMATIC TOOL CO.

TOOL MAKERS SINCE ·1893

THOR

HAMMERS

7. Fl. 5: Trie ma- teria is turned on 'n lathe thio The wellknown tea- le spécimen with shouldered, ends and is then grip. ped within the test.

ng machine be-.

PIO 5

tween spherical sealities in the usual way.

Fig. 7: Wire ropes are pro- 'vided with BoC niets at the ends

und are then Tield in tha

Wedgo cham

Fig. 6: Plain

round and flat bars tre grip- ped between serrated ed gcs.

tiers or the milichfrie.

Load Impulses between I gk/-4 mm (lower land init) and 19 Kg/mm3 (upper load limit). The

bars of the sections shown above. The texts show that annealed material supports a considerably higher number of load Impulse before it fructures. See g. 13.

/

Irrigation By Remote Control

The water-flow of the Rangithu river Irrigation scheme in New and Zealand can be switched

from U central position through an electrical remote con- trol apparatus, which has been, supplied by "the "Genefal-Electric *** ** 4* 17 Company, Limited, Magnet House,

not armodel

Kingsway, London. The water- flow through various páris of a

TECALEMIT

ALL TYPES OF LUBRICATION ARE CATERED FOR BY

TECALEMIT

LIMITED

HYDRAULIC & MECHANICAL DESIGNING AND MANUFACTURING ENGINEERS,

GREAT WEST KOAD, BRENTFORD, ENGLAND,

Sole Agents

LEBEL (China) LIMITED.

Union Building, Pedder Strent, HONG KONG

THE LINCOLN

300 AMPS WELDING GENERATOR

diversión race of the river is con- SHIELD ARC WELDER'S

trolled by live vertical Bft gates, All operated by electric motors. the gato positions are linked by overhead pliot wires to the ir rigation headquarters, where the control panel and its equipment ore installed. On this panel, each gate is represented by an Indicat- "select" log lamp and a lever typo

are push

butions

Dir. Rey. Th" and "down", and

15.) Comparative Tests an

ferantly Prepared Material

AAAAA AAAAA

Imirked

top, and an indicator showing the position of any mate., To "select a gate the appropriate "select" key is depressed so that a "start" #ignal le transroltted ta the control equipment and the "sending" selector is adjusted for the particular station requir- ed.

Bupervisory equipment át áll: the gates is set in motion by the transmission

AUTOMATIC WELDING EQUIPMENT

FLEETWELD ELECTRODES

STOCKS CARRIED

BY

J.P. INGLIS & SONS LTD. CORNER CHATHAM and MATAUWEI RD.

TEL. NO. 38954. KOWLOON.

Representative For South China and Hong Kong THE LINCOLN ELECTRIC CO. AUSTITALIA. PTY. LAD.

of another signal TESTING EQUIPMENT

over the pilot wires. The in- dicating lamp adjacent to the ap- propriate "select" key shows the operator that the gate required has been properly chosen.

He then depresses · 'tho "up" The g. 1 shows in kg/mm "down" press button, energising the false strength as obtained or de-energising a master reliy, by pulsation tests of material of so that the gate motor is rug in sumitur quality and section, but the appropriate direction or stop prepared differently. It shows: ped. Whom any selection er

a) flat bar,

lapát bar with hole c) barwith one rivet' dbars with two rivels ||((0) barn„with 4 rivets bars with rivets onc-ilde weld

two-alde wold-

operation has been completed, the equipment is restored to nermal by replacing the "select" key on the control panel. The system dics hot interfere with local electrical or manual operation of any 'gafoj and ·

call boperation of this kind

*checked from the control panel by the position Indicator.

FOR ALL REQUIREMENTS

PULSATORS

FATIGUE TESTS

Thor Hummer Constr

the hchievement of long years of englpeor

experience in the buildin Pneumatic tools. Designed and developed by engine

whose substitial con

Hight remote corners of gibbe

att of tool making have won acclaim in the Iammers embody. Those improvements in design

anu constructión co essentill to tools that thuat stand up under the shock and strala Which they are subjected in modern Industry.

YU TUNG TAI LTD. Engineering Dept.

21, Queen's Ballding, Tolanhane: - 33145 (^^iju Distributor for Hong Kong and China.

WILLIAM JACKS & Co, Ltd.

OFFER FROM STOCK

ASBESTOS CEMENT ROOFING SHEETS AND RIDGES

HARDBOARDS INSULATION BOARDS

BRASS RODS & SHEETS COLTS & NUTS, RIVETS

ROOM

PUMPS & PUMPING SETS FRACTIONAL MOTORS ALL TYPES OF BELTING

AS FIRE HOSE PINCES BAYILANENCHOSDEL.

Pump,

SIBEN MEGNER & CO., LTD.

HONG KONG E

PHONE