Page: 8
(IL)
TINGUISHED
ENGLISH
RVİCE
ELECTRIC
MOTORS
FOR
·THE CHINA - MADAN
THURSDAY, AUGUST 19,- 1948.
ENGINEERING PAGE
PLASTICAL
0. EVERY INDUSTRIAL DRIVE
THE JARDINE ENGINEERING CORPORATION LTD.
14-16 FEDDER STREET, HONG KONG.
TELEPHONE 30311.
ARNHOLD & CO., TLD.
Sassoon House Shanghai.
AGENTS FOR ––
Holland House,
Hong Kong
STANTON IRONWORKS CO., LTD.
NEAR NOTTINGHAM, ENGLAND.
MANUFACTURERS OF
SPUN CAST IRON PIPES & SPECIALS
AND
CAST IRON DRAIN PIPES
AND
FITTINGS.
PRICES ON APPLICATION.
PLEASE SEND YOUR ENQUIRIES FOR CAST IRON PIPES TO US
ARNHOLD & CO., LTD,
PIE
Tel. 30100 & 31957.
60
lube. Thus,
OPTICAL SYSTEMS FOR DT-180 TELEVISION
however, probably
represents the practical limit of picture size in this type of domes tic receiver, since farger cathode ray tuben
are unwieldy, and ex- pentivo taina, At the same thne,
Plastic In Bulk
In the type
of television re- the mass-production of domestic paratfun, of such moulds is still a tively. The pleture size given by ceiver most commonly used at the television receivers. These limita- long and expensive matter; and it both systems is 16 in. x 13 tn., present time, the pleture is pro tions have now been largeiz rè- is only justified by the fact that, the chromatic aberraton is small, duced on the fluorescent screen of moved by recent development iu once a mould is made, a const and the resolut on, is claimed to the cathode ray tube, which is the formation and, use of trans-dorable number of accurate plasbe far better than is required for viewed directly or through a parent plastic materials, and partie reproductions can be aultnbly placed plane mirror. The ticularly by the Introduction of a from it. The time required to mission using 405-line acanning. made the present B.B.C. television trans- 12-in. cathode ray
tubes surface-anishing process by means make an optical component by, the Although the analler of the two normally used give pictures of of which plastic componente about 0 in. by 6 in. In dinien-igh optical quality can be pro-long, although the actual handling fance of 40 in. between the of surface-fulshing process is quite systems requires a throw dix- sions, while a somewhat larger duced on a large manufacturing time by the operators is short. It cathode ray tube and the viewing picture in obtained with a 15-in. scale.
has been decided, therefore, that screen, it was shown how this ha order to keep production costs could conveniently be incorporated low enough to allow the optical in a receiver console of normal systems to be used in domestic dimensions. A third Schmidt television receivers, Jarge num-system suitable for television pro- ber of moulds should be used and jection in small cinomas was also A description of these develop these should travel through the demonstrated: is desirable that the teloviston munts with demonstrations of their various stages of the process on a mirror of 18 in. diameter and gave
this contained receiver of the future should pro-application to television reception mechanical conveyor, A factory a picture with a length of diagonal duce a pleture of about twice the was given in a lecture before to be operated along these linosis of 1234 . abuve size in linear dimensions, the Television Society by being prepared, and it is hoped to i and preferably on a flat screen, Dr. D. Starkle, of the Plastien start manufacture at the end of Although the lecture was pri- With this object in view, develop-Division of Imperial Chemical In this year,
marily devoted to the use of plas ments had begun several years ago, dustries, Ltd. Two plastic inate-
tie, optien) components in tolevi- of a reproducing system using ariels are available in bulk supply small cathode ray tere with
afen reception, it was pointed out in Great Britain. They are poly-
that since the new surface- fuurescent screen only
metnyl-methacrylate two
and poly-
Anishing process allows complicat. izeo inches in diu neter, on which styrene, and are supplied la op Dr. Starkle demonstrated two ed aspherical optical components a bright clear image is produced, ticully pure form as Transpex 1 prototype Schmidt television pro-to be made at a reasonable cost, the light from this image being and Transpex 2' respectively, with Jjection systems for home recefsit. L. likely to have an important than projected through a suitable transmission values, for visible vers, using cathode ray tubes of | effect_in the general feld of optical system to give an enlarged Lght corresponding approximately 2 or 3 in. diameter, respec- applied optics. picture on a flat screen. While to those of crown and fint glass. considerable progress has been These materials are sensibly un- made in cathode ray tube design, affected by continuous exposure to the picture brightness obtainable sunlight, and, although they have un the tube is insufficient to give a saflening temperature of about satisfactory resuits when using an 120 C., by taking great care to optical system of the conventional avoid any strain in the material type, For this reason the Schmidt luring fubrication, finished com- optical system, which was origin- ponents
show No measurable
ก
or
ally designed for use in astrone.jchange in form whion used under: mical telescopes, has been appled the most severe operating condi to the projection of television pictions. The production of the tures. The great advantage of components takes place in
two this system is that it has a large stages. First, a 'preform' is cust light-gathering property, and sons necurately as possible by some enables the utmost use to be made known method. Then thin akin of the picture-brightness on the of the same material is built cathode ray tube.
Concave Mirror
oh the surface of this preform in- sida an optically worked 2luas mould, until the surface of the component nakes optical contact at all points with the mould. A transparent mould material is vision receiver, a legs conenveechssary, since part of the repro- mirror ut large aperature duction process. is polymerization by Hght: but, in addition, ginsa In halk supply and ali risk of scrat- the hardest material available in
ching during use must be avoided
As mounted for use in a tete-
of the
pinced opposite the end cathode ray tube and projects the Ilght forward past the tube Lo- wards the viewing screen:
British
Home Receivers
Tube Construction Development
The
arder to correct for the spherical The aspheric moulds are Arst ma- tubular construction. now being surface aberration introduced by a mirror shined us accurately as possible
and then Anished by a skilled op-| of such large aperature, corretical worker by hand. The pre- far plate is introduced into the projection system. This plate hus u non-spherical surface of complex shapo and, in the Schmidt system, is mounted at the centre of cero. ture of the mirror. To produce such an optical system in ginas is, however, a low and expensive matter, since the aspherical sur- faces of the corrector plate require long and patient hand-work by u highly skilled craftsman. AL though many attempts have been mode to produce such plates by moans of machines designed to work the surfaces automatically.. this has so far not been considered _to_be an economic proposition for
Kee Klamp system of acrew up tight against the outer of the tubes. The introduced Into Hong Kong tightening key fits Into the makes full use of the tube ns-haxagonal socket in the screw structural material because of its | head....... Tests have shown that constant strength in every clr-one scrow will hold a length- cumferential direction. Thle of wise load of 2% tons. fers a new safe and economical- It can be seen from this des method of construction for a wide cription that no skilled labour is variety of purposes.
needed in the construction, the sum total of the labour required Kee Klamps are simple in de-being to cut the tubes sign and yet extremely effective, length and placing a Kee Klamp ubes to required the principals being a central on to the tabe. The illustration sleeve forming a sliding it for shows a framework of shed but main structural tube. Around that is only one of the many uses this central sleeve are one or tor. Kee Klamps which can be more sockets into which branch utilised in the tubes are sliding, ats. To hold these tubes in position, harden- ed, steel cup-ended set screws
·RACK MOUNTED
AMPLIFYING
EQUIPMENT.
6-Valve fully bandspread superheterodyne, receiver -very high performance.
Microphone mixer Taking up to 4 separate inputs.
MAIN 60 WATT AMPLIFIER
Amplifier controls, metering Facilities.
Manually operated record player slides in, and clogas neatly, with Pra precision.
* Power supply ko, main amplifier.
FOR USE IN FACTORIES, THEATRES HOTELS, SCHOOLS' AND ALL PLACES OF AMUSEMENT
Extreme 'flexibility is a feature of this standardised Pamphenie Rack equip-- ment by Fye. Power outputs of 80, 120, 250, 300 or 1,000 watts, are suð- plied with nay. combination of the ancillaries pictured above, the whole trop- lealized, all metals zinc-plated, passivated and fleshed in marine cellulose.. Address your Enquiries to
Our Sole Agents for Hong Kong & South China {... GILMAN & COMPANY: LIMITED
Gloucester Arcado
RADIO DEPARTMENT
Building Materials
Here is the later supply_ posi-.. tion in Britain for basic bulking; materials and their export pos- sibilities. Asbestos cement pro- ducts are now being exported from Britain at the increased rate of over £150,000 a month; this rate should increase provid- ed that sufficient shipping space Is available and no great shor- lages occur in Britain itself 'dur-
Locomotive
For Gradients
The Hunslet Engine Company
of
construction storage racking, cow stalls, ten- nis court surrounds, Bwings; garages, exhibition stands, etc.,
New British Receiver
A new British receiver speel- deally designed for personal cabin use is reported in this week's. "Syren":
quoted. There are many sharp gradients ontal
Odors should be adhesion working is necessary, fasions.
This
Perkins
DIESELS
F. PERKINS LTD. Type S6M Marine Diesel Engines 100 HP-2,000 RPM
Complete with roverse gear and 2 to 1 reduction gear
Available for early delivery.
Sole Agents:
GILMAN & COMPANY, LTD.
ENGINEERING DEPARTMENT Telephono 33461,
KEE KLAMPS!
1WADE WAST
THE ACME OF
SIMPLICITY.
IN
TUBULAR CONSTRUCTION
STORAGE RACKS
TOWE, CONSTRUCTION
AGENTS:
en W. R. LOXLEY & CO., (CHINA) LTD.
YORK BUILDING"
It is the latest in the "Eddy | Pixîloth ing the building season. Sheets Limited, of Leeds, has produced stone series of marine receivers are in better supply, than pipes.a locomotive of new design for fond is, claimed to meet all the Ericks and tiles are in good sup
special requirements of the tise on the Gunqui-La Paz Rail- seafarer. For example, it ply. were released from export way of the Peruvian Corporation us on the short control recently, and early do-j
at heights above 12,000 feet. livery dates can be
feature of a seaborne Cement cannot be exported quite on this railway, some as steep long periods be
receiver since
the ship may for outside the at previous levels until the end as one in 14,'un all-of
which range.
of
wave broadcast of the year.
The
electric placed well in advance. Glazed On' many of these mountain lines
may vary when changing tiloa, coloured and mottled, are axle loads are limited by rafi may be wanted for use ashore, and occasionally the receiver freely available for early delivery weights und bridges. In this new sot provides for this and inquiries are encouraged, new 2-8-0 locomotive the maxi- nidins of various voltage with a by operating off either. DC or AC White and cream tiles are in good mum axie load is. 10 tons, but minimum of adjustment. supply and deliveries should get 87 per cent, of the total engine maily, a loudspeaker bullt into even better.
weight is on the coupled axles headphones
the receiver. will be used but For at an is external Metal windows should main Dimensions are: "cylinders 16 speaker, can also.
easily be talk their present export rate in inches by "24; coupled wheels 3 plunged in, the internal speaker spite of the reduction in the feet 10 inches diameter; working being autoniatically allenced.. steel allocation for the second inch; heating suracell tubes 500
pressure 200 pounds a - square 1,
large lubos quarter of this Your. There 258 square feet, should be, no shortage of high heating surface is 183 square. and firebox 93 square feet; super- grade "purpose nude windows, feet and grate area: 16 square. Pidator, plasterboard and feet; tractive effort at 75 per cent.
Woman's Round
gypsum are available in limited Erako power, 20,000 pounds; fae- World Flight
supplies, which could improve for of, adhesion 4.5. during the next few months.
Piat
Cambridge, August 17. Red-haired Mrs. Richard
Some potter's plaster and pluster Although equipped with oll- of Parts bro
avallable. burning apparatus It can be Taiti 24-year-old-x-artist's Sheet and
gipss exports adapted for burning soft coul. model, bustled around in the have been running of an ave
average rate of £300,000 a month; this There are great difficulties in rain today, making last minute level is expected to rise consider acrignine steam locomotives for preparations for the start of a ably during the last six months working at high nititudes. To round-the-world flight on Wed- of 1948. Roofing, and damp water boils at a lower temperas nesday, A broof: equrse felt exports have ture than "at- egn
level, for one shown a slow but steady increase thing, and steep gradientami. as * Sha, expects to make the flight over the past six months. a la this case, an adhesion type of fishix weeks.
locomotive is required-maka
The route calls for stope in Sanitary ware and pipes can the difficulties even greater. In France, Sardinia, North Africa, be exported, with early delivery this case the problem was fure Cyprus, Italy, Iraq, Bahrein on Customers musti still be rationed ther complicated by the fact, that the Persian Gulf, Arabia, India, for sanitary earthenware, but ex- the locomotive for, Feru could Burma, Blam, French Indo-China, parts are well above pre-World not be in hon eno because of China, Japon Aleutian Islands, War II levels and they should the construction of the track and get Glm and Anchorage. In incrasso in the second half of bridges. This, numerous proNG 104) Blatte below 10 by 20 bioms have been overspine with VARDAGS inckes in site are exported freely, considerable technica) ikili Kaby BURZE MENO
sizga. La still the makers, of, this: Hany mente 031544
high power locomotive, satinument
phonu, 37017.
Limited
Iceland.
Inertol
REGD.TRADE MARK
TEL:-34100
Metal Structures, Concreto Surfaces and Brick- Products for Waterproofing and Protection of work.
Stocks Available.
THE INERTOL COMPANY, LIMITED,
Hull, England.
Sola Agents for Hongkong & China
SIBER HEGNER & CO., LTD.