28 AIRCRAFT ENGINEERING January, 1932 Screening for Sparking Plugs—Nickel Alloy Steels—Rustless Steels—Springs—E.S.C. Laboratories RADI O SCREENING FOR SPARKING PLUGS E.S.C. LABORATORIES The complete screening of the ignition circuit Sir J. J. Thomson, O.M., F.R.S., recently on engines becomes more important as wireless opened the extended research laboratories of the receiving sets of greater sensitivity come into use. English Steel Corporation, Ltd., at their Vickers Fo r complete screening, in addition to the magneto Work s in Sheffield. an d high-tension cables it is necessary to enclose Th e process of rationalisation which first linked th e sparking plugs in "earthed " metal casings. th e steel interests of Vickers, Ltd., at Sheffield, Th e photograph reproduced shows an outside with those of Armstrong-Whitworth at Openshaw, view of a device for this purpose made by Lodge Manchester, and then brought in those of Cammell Plugs, Ltd., of Rugby, and the partly sectioned Laird at Sheffield and Penistone, to form the drawin g shows the construction of the screening English Steel Corporation, naturally compelled a cap and how it is fitted to the sparking plug and corresponding fusion, or rather reorganisation, of high-tension cable. th e various laboratories of the group. Apart from th e Chemical Laboratories which are essentia] for Th e screening-cap consists of a nickel-plated th e control of any steel-making operation, above copper casing lined with bakelite insulation. The all in the manufacture of special alloy steels, each casing is in the form of a small cylinder with an of the companies concerned had maintained ar m at right angles. The base of the metal Metallurgical Research Laboratories equipped with cylinder rests on the gland nut of the sparking apparatu s for the metallographic studies which plug and is held down securely by means of a ar e now as essential as chemical analysis if a high spring strap. The strap still allows the screening standar d of quality is to be maintained, defects ca p to swivel so that the high-tension cable can b e laid in any radial direction. At the end of the ar e to be avoided, and improved or novel materials ar e to be developed. Each of these laboratories right-angle arm is a sleeve grip which makes ha d been successful, not merely in maintaining the contac t and securely holds the metal braiding of steel works which it served in the front rank of th e high-tension cable. Embedded in the bakelite special steel makers, bu t in making not unimportant insulation inside the cap is a metal sleeve which contribution s to scientific metallurgical progress. fits over a spigot terminal screwed on to the spark ing plug. A pin projects from the sleeve into the Naturall y there was much similarity, and even right-han d arm and ends with a spike which makes overlapping, in the metallurgical problems under contac t with the high-tension wires. This cap investigation, due, of course, to the rivalry of the provides a perfect radio screen and also a quickly respective companies in the production of heavy detachabl e cable terminal, as to remove th e screen forgings, special steels, etc., but each had to deal ing cap from the plug it is only necessary to lift with specialities not handled by the others, whilst off the yoke of the spring strap . All the steel parts each had evolved a distinctive character. Under ar e rust-proofed. thes e circumstances the concentration of the research resources of the group a t a selected works This screening cap is suitable for use with presente d great and obvious advantages which NICKE L ALLOY STEELS sparkin g plugs of the usual external shape. For might, however, be largely discounted if the th e cases where it is important that the distance Th e Mond Nickel Company, Limited, of Imperial process of fusion led to any loss of individuality tha t the cap projects from the engine should be Chemical House, Millbank, London, S.W.I, send or freshness of outlook of the research workers a s short as possible, a smaller cap is made. This an informative booklet on "The Mechanical thu s brought together in collaboration. Eventually small cap, while being made to the same con Propertie s of Nickel Alloy Steels," which has been i t was decided tha t the existing research laboratories struction, projects ½ in. less, but its use entails an specially prepared with the purpose of aiding a t Vickers Works, Sheffield, should be greatly alteratio n to the sparking plug to make it suitable. designers in the selection of steel suitable for their extended for the occupation of the merged staffs, Th e total weight of the larger cap (illustrated) is requirements . Details of the composition and bu t that sufficient scientific staff and equipment 3¾ oz., while that of the smaller cap is 3 oz. chemical and mechanical properties of various should be left at the other works to maintain such steels are given, based mainly on those covered by control, both metallographic and pyrometric, as British Standard and D.T.D. Specifications. could not be efficiently exercised from a distance. COMMERCIAL RUSTLESS STEELS Th e chemical laboratories could not, of course, Th e Consett Iron Company, Ltd., send a booklet be dealt with in the same way. At each steel on their "Bearco" copper-bearing steel. This works within the group it is necessary to maintain steel is a commercial carbon steel carrying a per an efficient chemical laboratory in reasonably centag e of copper which has been found by ex close proximity to the melting furnaces. Indeed, periment , it is claimed, to give corrosive-resisting a t the Vickers works, where the largest general propertie s superior to any ordinary carbon or chemical laboratory is situated , there are in addition corrosion-resisting steels or irons on the market. four subsidiary or "stage " laboratories, three of Th e firm do not claim tha t it is absolutely rustless the m attached to melting houses, and the fourth to bu t point out that steels which ar recognised th e steel warehouse with the special object of a s completely non-corroding are much too expensive finally checking steel bars and billets ready for for most commercial purposes, or for bulk re despatch . quirements . The steel, which can be rolled and All the laboratories of the Corporation are com fabricated with a content of copper up to 1 per bined in one organisation to form a metallurgical cent. can be supplied in plates, sections, or bars an d research department, which is divided into a t little more cost than ordinary commercial steels. four sections whose respective functions are de scribed in the next section. The department SPRING S FOR EVERY PURPOSE includes in its considerable personnel numerous Th e Norther n Spring Company, of Walsall Street, graduate s of th e Universities of Cambridge, London, Birmingham , have for twent y years been specialising Sheffield, and Birmingham. in the manufacture of all kinds of springs, and In order efficiently to perform these functions, are makers of Grover, flat, and Thackray washers, th e department is divided into four main sections, etc . They carry a large stock of springs an d washers each under a head directly responsible to the in standard types and styles, besides being in a metallurgist-in-chief, as follows:— position to meet an y demands to special drawings. (1) Chemical Analysis section. Their list includes hardened and tempered springs (2) Works Observation section. of every description, as well as springs made from (3) Metallographic section. hard-draw n steel, phosphor bronze, and brass wire. (4) Research section.
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Jan 1, 1932
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