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SCIENCE
THE CHINA MAIL, MONDAY, JANUARY Z+1957org
ENGINEERING
SLIDEWAY MOTION LUBRICANT The Prevention
DEVELOPMENT
Smooth Uniform Operation
As all production engineers know, slow-moving machine-tool slides and tables do not always operate with the smooth uniform movement that is necessary for the production of high-quality work. In effect, this trouble is a particular case of the stick-slip phenomenon propounded by Professor Bowden many years ago. It arises from an unfavourable combination of friction conditions and design factors. Stick-slip can, of course, be prevented by If not prepaid * booking fee controlling design variables such as the mass of the sliding body, the modulus of rigidity of the feed mechanism and damping forces, but to achieve the optimum for all operating conditions Kong Write Wm through design control is a matter of great
difficulty.
ALTERNATE 'INSERTIONS 10% EXTRA
of 60 cents is charged,
iskirst
AGENCIES
MANUFACTURERS wealerp:oof weligiam asa primustie electioùghting "nungs and accel• porate Wish to suppusat agent/mockLAT Porter & Co, Glasgow, Seolland.
PREMISES TO LET ISLAND
MODERN APARTMENT at 945 Mac- donnell Road, large verandan with beautiful pes view and peasant gar- den. Aitting room. I dining rostli 3 large bedrooms, 2 bathroomin, ser- vants room and w.e., stos instatistiou complete. Passenger and service lifts. For more parculars ring_Mr P. S, Chung of Cheong Lee Cun- struction Co., Tel
1-0 p.m.
72.477. From
FOR SALE
YE GLOE MILL. A distretiye hand- trade nationery. In boxes, 50 Micela Datepaper, 30 envelopes, Post Bro Duke fly, $10 per By,#14° per box. bux from 9, C, M. Pont.”
ITAND
STAMPS
ALUUME - Collection Buller" Derien, New stock now available, K. From South China Morning Post Ltd, Wyndham Street and Salsbuty Road, Kowloon.
BOMETHING EXCLUSIVE, Collec- tora • packets of amorted atampa, From 20 cents per packet upward.
serira. An entirely new
South China Sturning Post Lad, Wyndham Streel. flongxung and Salisbury Road, Kowloon,
To ADVERTISERS
BUNDAY POST HERALD Ораов for cammaratal advertising should he booked not fator than noon on Wednesdays.
For the BOUTH CHINA MORNING POST and the CHINA MAIL, 48 hours before.date of publication.
Spectat Announcements and Classified Adverties - mente sa tuumi.
NEW TERRITORIES
FANLING UN LONG
& SHEUNG SHUI DISTRICTS.
THE
CHINA MAIL
is obtainable
from the
SHEUNG SHUI STATION STALL SHEUNG SHUI RAILWAY STATION.
Orders Accepted Deliveries Undertaken.
»Bayer's «... TONIC
As
result the storing-
process is then repeated.
鏡
This
is, of course, an example of stick-slip motion.
A much more practical and convenient solution, where spring contracts and draws mechanical conditions encourage the upper plate back till stick-slip motion, is to aller comes to rest at some position the friction conditions, This of lower force and the whole can be effected by the use of a lubricant whith has special Properties to ensure that stalle friction is less than kinetic friction; in other words, lubricant that acts in such manner that friction increases with speed instead of decreas ing with speed, which is tho more usual case.
Til
R
a
This stick-sllp problem In relation to machine-tool slides has been thoroughly studied at the Thornton (Cheshire) Re- search Centre of Shell Research
For the purpose
of the Investigations 1 was decided to adapt a method developed by Merchant, using
apparatus shown in the accompanying illustration, a modification of the well-known Bowden felotlon machine.
Essentially,
apparatus comprises a hydraulic cylinder, a base block, a lower plate free
the
the
The apparatus used at the Shell Research Centre for testing slick-slip problems in relation to machine tool sudei. With this equipment
it is possible to determine the ratio between statio and kinetic friction at different loads and different speeds.
to slide in relation to the base block, ond An upper plate mounted on and free lo silde in relation to the lower plate.
to
The surfaces of the lower and upper plates are prepared símulato machine-tool allding surfaces.
The lower, plate is connected
to the ram of the hydraulic
cylinder, while movement of the
is
The
When icinetic friction greater than static friction, the upper plate will move forward with the lower plate until the force of the restoring-spring equals the friction force. lower plate will continue to move forward, while the upper plate slides on it, but does not slip back. It the lower plate is stopped, however, the lower plate slips back until the spring tension is reduced to equal the statle friction.
Of Fungus Stain
A sensational new fungicidal water repellent preserver for the protection and preservation of painted (or unpainted) masonry, known as Driwal, which is about to be introduced from Australia, should have revolutionary resulls on the external appearance of residences throughout the Colony.
It is a silicone, à group of remarkable synthetic compounds midway in chemical structure between glass and plastic, with an additive which gives special merit as a fungicidal alkali fixative, namely a xylene soluble mkium fixative with fungicidal properties. It adheres Driwai tenaciously to lime compounds in the pores of masonry giving superior durability over straight silicone solutions.
Driwal is quite invisible, intensely water repellent, and needs application once only over Snowcem and similar type paints, new or old brickwork, concrete, cement rendered surfaces, asbestos, natural stone cement, clay tiles and similar materials.
い
It can be applied as a primer, or over existing paint. It not only, completely excludes moisture the major cause of building decay-it repels' slained rain and mains water, and dew discoloured by surface dust which would otherwise be absorbed and result in the usual soiled and aged appearance-and it has a remarkable effect in preventing fungus stains.
An exterior test panel (right) brushed with Driwal carlier this year, compared with an untreated panel beside it. Note absence of fungus stains.
MANDRAKE THE MAGICIAN
the
118C
--WHO PULLED THE EMERGENCY
CORD?
THIS
MAN-/
With this apparatus. displacement of the upper plate (and hence the frictional force) can be measured by the of a deflecting mirror, and scale.
static Consequently, the
and kinelle friction of a-lubricant can be determined for conditions of speed and loading typical of machine tool practice. The re- sult can conveniently be ex- pressed in terms of the ratio stalic friction
I
kinetic. friction which has to be less than unity
it stlck-slip is to be avoided.
As a result of the investiga- tions Shell Tonna alle have been developed.
trip,
"Butter they contain non- and oiliness
the
additives to give them necessary friction characteristics for use on slideways and bed- ways of machine tools, Shell Tonna oll 27 can be used as a combined hydraulic medium and alkeway lubricant; Shell Tonna oll 32 is quitable for the tableways of small and mediuin machines, for the tableways of larger machines Shell Toma oil 72 is recommended,
The special frictional proper- tice of thesd allá have proved useful in applications other than machine tools but where also smooth functioning is necessary for mechanisms operating termittently or at low spoeds,
Generating Plant For Malaya
A 12,000-KW turbino-
upper plate is restricted by a generator et has been ordered horizontal restoring spring from
Metropollian-Vicken by
anchored to a vertical extension the Perale River Hydro-Electric of the base and by the vertical Power Co., Ltd, for whom loading spring that can clearly similar machine is already in be seen in the Illustration,
hand at the Trafford Park Works,
*
Both fete are to be installed
The hydraulic cylinder Ime in one of the · company's ports a controlled slow-speed thermal stations at Malim drive to the lower plate, while Nawar
the loading spring gives
in
the
necessary interface pressures. It About 07 per cont of the is therefore easy to simulate all electrie, power generated in the conditions that will be met Malaya is required by Ule tin-
practico.
mining industry, and about 89 As the lower plate moves, the per cent of this in supplied by behaviour of the upper plate the Perak Hydro-Electric Co.,
dicates the relationship be. The now tween the statle, and the kinetie
turbing generatorn friction induced by the lubricant will be similar to two 12,000- under Leal.
kW sola mupplied to the same
af staile friction is greater customer before the war, but than the Hinelle friction, the art for higher meam conditions. upper plate moves with the
Tho generátoch, will be of
construction
turbo
lower plate, until the force of giantlard the restoring-spring equals the alatie friction, when the upper wound for 8.0 kV Subhaso plate will slip relative to the 500/s; they are designed for a lower. At this point the friction power factor of 0.68 had a KVA is kinetic and is less than the capacity of 17,080, to enable force exerted by the restoring them to be used for litt
charging.
SAW THAT HANDCAR OUTSIDE. IT GAVE ME
ANIDEA.
FERDINAND
NANCY
| AQUARIUM
HOURS 9-5
I'VE GOT TO TELL YOU THIS MUCH, I'M ON A SECRET GOVERNMENT MISSION, ENEMY AGENTS ARE AFTER A PACKAGE IM CARRYING!
40,
I'M GLAD · I · BROUGHT, AN
APPLE WITH ME---I'M
HUNGRY
E
JOHNNY HAZARD'
[INTHE DARKENED PLANETARIUM THG SHOW
BEGINS.
TAGCALLED BY GOME THE {"PALE GODDB55; HOWLED AT-
BY OTHERS IN ITS FULENESSM {RHYMED WITH "UNE" AND DRES
ISPOON WE GIVE YOUW TH
MOGNOM
WHY
DIDN'T YOU SAY SO? NOW WHAT
HMM...
I DON'T THINK I'LL EAT
1
Mail Notices
The Intern 'kimex of posting khawn below are thais. EDT KES
In rennya); "ts Sarlier than thà 0.3.0, limes can be ascertained by country on the Jukul anos. Wine jetest polling times for registered Artičkov 'new' trdotally, ane, hour emeller, Klian táo tiniva shown below. Purtieninis regard. ing parvel malis tan de ascerá tained by enquiry at thy post
MONDAY, JANUARY
By Air
Burma, India, Kukistars, Mast, Grant Beliaus Burope, a p.
Middle
By Surface
Messo, 8 pan.
TUESDAY, JANUARY 1
AL
Poing. Shanghai, Kunding, mú kow, 7.,ELL
Thailand, Cambodia, #a.K
p.m.
Australia New Zealand, }
Indo-China, Fremsen, Hood.
Philippines, 1p.m
Guid, Hawaii, U.S.A. 1 p.m.
Malaya, Indonesia,
p.
Formos, 8p.m.
Thatting Burma, India, Pakistan,
Middle East, Africa, Great Britain da scurope, 0.0
Canada, 6 p.m.
Philippines, N. Dorneo, & p.m.
Hawal, J.G. 0p.m
By Surface
China, People's Republic. 7 A.. Марта 1 роль
Philippines, a p.m.
Formosa, Korop.L
N. Borneo, Rabéu, Augiralia, New Zeeland, 4 p.m.
Japan, Iawall, U.S.A., C. & H. America, p.m.
Thailand, p.m. Mação, p.
WEDNESDAY, JANUARY
By Surface
Chinn, People's Republic, 7 a.. Italy Trance, 4.3.
Br. Best Afrion. P. East Atra S. Africa, N. & 8. Rhodes & Nyasaland, Parcels via La Marques, 114.
Macao, 1 p›m
Arten, 2 D.in.
Malaya, Ceylon, GL.
Europe, 4 p.m.
Macro, i p.m.
Stole Trousers
From Stall
Planding gally to a charge of simple, larceny, ....Twuk KHAN, 42, of 37, Spring Garden Lane, third floor, was memtmény) to one month imprisonment; by. Mr 5. X d'Almada at Central this mething.
that at The count was fold about. 9.30 pm on January 8,
wefendant stole three pairs of Pyjama-trouEDOTEL from Tang KUK Si, o clothes hawker who had aslail outside 21 Spring Garden Lané,“ Tang Immediately quscovered; the lon and saw atendant running away witho .com- Dunale under - his armi. pautant at once gave chase and Vernually had defendsint
the junction of
clay loud and Johnatons constable on duty. www by a pouce
Desengant wda then Dagill Bits 10 Eastern Police biation where he was charged.
SUSPECT HELD
A fountain
pen was stolen trom a Chinese youth outside the New World Theatre, Des voeux Road, Central, at 7,30 Dm. yesterɑný. A man is being held by the Police in connection
· with the offence,
Seriously Hurt
Serious injuries were sus- aritám,tained by a 38-year-old Chinese
THURSDAY, JANUARY 10 By Burtace
China, People's Republic, 7 4.m Maco, 1 puma
Japan, Hawal, a_p.m.
N. Borneo, a p
idoriente, p.m.
MACRO, & p.m
FRIDAY, JANUARY 11 By surface
+
China, People's Republic, 7 a.tn. Dr. East Africa, 11 a.m.
N. Borneo, Noon.
Mamo, 1 p.m.
Koren,p.m.
Macro, 6 p.m.
SATURDAY, JANUARY 12 By Burface China, People's Republic, Ta.m Forben, ..
Malaya, Burma, India, 11 am Mioco, 1 pm
China, People'r Hopublic, Macro, 0 p.m.
}
p.m.
By Lee Falk and Phil Davis
THERE'S A PLOT TO WRECK THIS TRAIN--| I WANT TO RIDE
AHEAD ON THAT
HANDCART
AS THE AUDIENCE REACTS TO THE SILVER ORE, "A POCKET: FLASHLIGHT IN THE HAND" OF COUNTESS NEEM SIGNALS THAT HER ACT IS ABOUT TO BEGINË
THEY'D GO THAT
FART
wik
THEY'D DO ANY- THING TO GET THAT PACKAGE! LOTHAR LET'S PULL THAT
HANDCAR ONYO THE TRACKS.
By Mik
BUS TERMINAL!
By Ernie Bushmiller...
I HAVE A FEELING THERE'S A WORM
'IN IT
By Frank Robbins
AND IN THE VIEWING SCREEN DIN SHAPE DES |LIGHT-SENSITIVE CAMERA' A STARTLING WAGE.
E HAUKAIS UN SKIN BY THE NAKED EVILL T
A
at 11.20 p.m. yesterday when he was knocked down by private car in Hennessy Hood bear its junction with Canal Hood West
The
injured pedestrian, Leung Kwan-yat of No. 19, Hing Hon Road, 1st Gode, was removed to Queen Mary Hoopl tal, where he is now detained for treatment.
Woman Victimised
.
A wallet containing cash and Jewellery was studen woman at 9.35 am yesterday. when her pocket was cut as she was walking along Shangħal
·Street nur Market Street.
There's More than Magic in CADBURY'S
tunia
"THERE'S A GLASS AND A HALF
OF FULL CREAM IN EVERY'IL BAR
FROZEN FRESH IN THE COUNTRY!
TRY
Abbys
FROZEN FOODS TODAY!
ROWNTREES
this situation
calls for
San Miguel