Page
CHROMIUM PLATING
Electro-Depositing Without Dismantling
and
1
from the connected
Our attention has recently been, lighting circuit. The current is relatively drawn to a portable plating ap- stepped down to the
main advantages low voltage required for plating. the paratus, claimed for which are that cop- and of the two leads equipment case, that per, nickel and chromium, also silver, gold and cadmium, can with the negative pole terminates. with a spring clip, while the lead be electro-deposited on metal sur- faces in it without necessitating from the positive pole is plugged any dismantiling. that the deposit into a short tube, at one end of which is a small, perforated-me- is at least equal in durability to
tal spade-shaped, plating anode. metal deposited by the bath met-
Over the latter is drawn a pad of hod, and that the equipment can
suitable covering be used wherever electric lighting felt or other has been installed. The appara material. The electrolyte is con- tained in a rubber bulb fitted on 1s manufactured by tus, which
the end of the tube opposite to Messrs. Chromium Portable Plater
the anode, and this is filled from Sales Compariy, 169, Hampstead- road, London, N.W.1. is. compact the stock laf in much the same
manner as a fountain-pen filler. and is enclosed in two wooden
The article to be plated is first cases which can easily be carried
thoroughly cleaned and polished from place to place. The Arst of
with electrical
& special grease-removing the these contains equipment. In localities in which preparation supplied by the firm
the cathode clip is placed on the the electricity supply is alternat-
work, and the spade anode pad ing current the equipment provid-
rubbed gently, with a regular, ed comprises a transformer and
even motion, over the whole sar- rectifier. and when the supply is direct current the equipment con-face of the article. The pad is sists of a converter. The second kept thoroughly moist with elec- rase contains the stock jars of trolyte by gently pressing the bulb plating from time to time. A perfectly plating solutions, the
smooth and bright deposit of cop- anade pads described below, and
or other per, nickel, chromium cleaning and polishing materials
metal is obtained, according to the casa is The electrical-equipment connected to the supply mains anode and electrolyte employed. plug OF The rate of deposition can be re- either by way of
thegulated by varying the current through a lamp holder on
a
Shanks
&
Co
LTD
» BARRHEAD-SCOTLAND
HONG KONG DAILY PRESS, SATURDAY, DECEMBER 16, 1933.
ENGINEERING AND BUILDING.
HIGHWAYS IN PROTECTION OF STEEL CZECHOSLOVAKIA
kla
报
PIPES
The Ancient History Of
Bitumen
Modern methods for the pro-, phalt "
comes from
or "stable"
"resistant,"
"The Czechoslovak Road Fund was established in 1828,, and, dur- ing the rat five years of its ex- istence, a sum of 1,800 million crowns has been disbursed from
ing, and the construction of new the Fund for the repair of exist roads. The State roads in Cze- choslovakia have a total length of 8.475 km.. and about half,
Babylon, namely, 4.190 km.. have now been, of 1,500
tection of steel pipes against "rust į meaning a natural bitumen, and million crowns' will be expended
and corrosion. especially when this has passed through Greek repaired, while a sum on the remaining 4:285 km New
used for towns water supply, con- and then later Latin to English State ronds are to be constructed. at a cost of 300 millions in Slova-sist essentially in the use of bit and French. (Asphalte). To the men which is applied to the out- Greeks the name was synonymous and Carpathian Ruthenis. Highways other than State roads, side of the very hot pipe immedi- with
pipes are 1e, those under the control of ately after manufacture. For fun- and most of the ancient races of
tots! ther protection the local authorities. have A length of 10.000 km., and it is wrapped tightly in bitumen satu- hoped that a sum of from 1,300 rated cloth or sheathed with a to 1.500 million crowns may be thin layer of seamless bitumen available from the Road for work asbestos composition. Either met- on these roads during the next hod, gives adequate protection a- gainst fresh and salt water as 10 years.
well as carrosive soil, while if necessary the inside of the pipe is also protected by a seamless bitumen layer about " thick, which forms a smooth, hard, glas. Consequently the great advant- sy surface, impervious to water. ages of steel for pipe lines as against both cast iron and cement fabricated pipes, especially for towns water supply, can be utilis- The name "bitumen" however, ed to the full, including high ten- comes from Sanscrit, by way of sile strength. elasticity, non-per-Latin, but whether this referred. meability, light weight and ab sence of breakage during transit and laying.
density by means of à disc on the equipment case, while the thick ness of the deposit depends math- ly, of course, on the time during The deposit tact with the work which the plating pad is in con- requires little further treatment.
SANITARY WARE
MODERN SANITARY
EARTHENWARE- APPLIANCES IN WHITE & COLOUR
THE JARDINE ENGINEERING CORPORATION, LTD
(Incorporated under the Companies" Ordinances of Hongkong)
14, PEDDER ST. HONG KONG.
SHAMEEN, CANTON,
SOLE ACENTS
For Constructural Work of Every
Description
Use Green Island Cement
TWO REFLEX TYPE ROTARY KILNS HAVING AN OVER ALL LENGTH OF 254 FEET. THESE KILNS ARE USED TO MANUFACTURE GREEN ISLAND CEMENT,
Issued by the
GREEN ISLAND CEMENT CO., LTD.
2ND FLOOK
EXCHANGE BUILDING
4.3
the Near East. Sumerians, Baby- lonians, Assyrians and Persians a cement in used bitumen statuary as well as mortar for building an as protective again- st water, ecpecially for boats, both inside and outside on the same lines as Stockholm tar many cen- turies later. To this day bitumen is still of course used in making boats on the Tigris for example. Herodotus also described "s well in the neighbourhood of Kirkuk which produced "asphalt, salt and oil," which seems to be the first definite reference in litera- ture to petroleum."
actually to natural bitumen most- ly found in petroleum areas, or to general" dark coloured Testnous material is not clear
STANDARD TENSILE TESTS ON SHEET AND STRIP
It is interesting to note these methods of protecting steel pipes are on the same general Lines as used by the ancient Egyptians 4500-5000 years ago for preserving the dead. The body was preser- red mostly by treating with bit men; followed by wrapping with a large amount of cloth in narrow A committee, representative of strips either soaked in bitümen all the sheet-metal sections of the or afterwards impregnated with industry, appointed by the Britishi this material, which was largely Standards Institution to consider obtained from the Mesopotamia the question of the testing of thin ares.
Bitumen, however, seems metal sheet and strip, have now to have been used at first as a completed the first stage of thel cement. The extreme resistance work, the result being the issue to moisture and disintegration of specification No. 485 Part 1- 1933. In this, which deals with generally is well indicated by an-
has cient Sumerian statues (Euph-tensile tests, consideration rates area) dating from about 3000 BC. which have the eyes and other portions, such as small shells to imitate the scales of fish. stul tightly attached because of the use of bitumen as a cement.
Great confusion has always been caused by the words "asphalt, "bitumen," and "pitch," and for example in the United States "usphalt" has quite a different meaning from that in Great Bri- tain or France. The word "as-
BUILDING
The perennial question of how a balance between theory and practice can best be attained in. engineering and our knowledge thus assisted to advance at the highest possible rate, has been raised during the last few days in two addreases, one delivered to an electrical and the other to a physical audience. In his presiden- tlal address to the Institution of Electrical Engineers, Mr. P. V Hunter pointed out that the old- fashioned type of engineer, whose training was "exclusively practical, has now entirely passed away, his place being taken successively ty those with a good theoretical know- ledge, and by those whose chief Interests were economic. He hinted that perhaps the pendulum-bas swung too far, and that, opinion was upheld. from another point of view by Dr. R. E. Stradling, in lecture ou "The Scientifle Worker in a Traditional Industry," which was delivered before the Institute of Physics on Wednesday, Novem- ber 1 The text of this lecture might be said to be that in buti- ding, at any rate, the traditional knowledge acquired through the ages by the practical, man should not be lightly scorned by the Such modern research worker. scorn, and the neglect which was Its "consequence, would, in fact, Impede development by fostering a spirit of antagonism between the practitioner and the scientist. An attitude of this kind is unfort- unately easily engendered; for the practical rules of building often seer absurd when examined by the scientist and the explanations offered for them are as frequently obviously wrong. As Dr. Stradling said, it will be found, however, that the closer the contact the scientist establishes outlook of the latter will be appreciated, and the clearer it will be that only by effective co-operation with him can any progress be made in a reasonable time. In other words, while it is true that more intensive scientific work is necessary,' the enthusiasm of those engaged in It will be most harmful, 12. It is not coupled with a clear realisation of the fact that those who have spent their lives in industry, know much more about general principles than the newly-arrived laboratory worker.
been confined to material up to 0.08 in. (14 8.W.G.) in thickness, and the specification provides for standard tensile test pieces having a gauge length of 2 in and a standard width of, 0.5 in.
test piece, alternative from of having a gauge length of 8.in. is indicated for use in exceptional
ca.ses.
An
CARMARTHEN
TOWN BRIDGE
"
For this scheme was estimated at £115,690. The Ministry submitted a modified scheme to cross the railway and the river, but then to " drop the road to quay level, pre- venting the town improvement Although discussions over Car- desired and reducing the coat to about £75,000. Many complaints marthen Town Bridge have gone on for ten years or more, finality have recently been made of the seems to be indefinitely postpon- inconventence of the temporary been [ed. Last July, the Ministry of one-way bridge that had
Transport declined to approve of erected some years ago, when the The Ministry the Carmarthenshire County Co old bridge falled uncil's scheme for a high-level of Transport have lately intim- bridge crossing the railway andated that no grant will be made, the river and then continuing on in respect of any scheme not ap- a gradual slope to the Castle proved by the Ministry, and the grounds, already the property of County Council regarding the Min- the Council, giving a greatly im- istry scheme as unacceptable, have proved entrance to the town and asked the county surveyor to re obviating the level crossing on the port on the possibilities of the re- one side and the steep hill from construction of the old bridge with the town on the other. The cost tower arches to obviate flooding. -
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Price with Rod'
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LUBRICANTS FROM A
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FIRM
the makers
fi
of the famous
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For many years we have been supplying loading factories with lubricants. Our research departments have given careful attention to the types of oil required, and these special lubricants are as outstandingly efficient for their own particular purposes as the world-famous CASTROL is in the motorworld.
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Agents in South China ROBERTSON WILSON & CO., LTD. David House, Hong Kong,