The Purchase Department.
Page 18
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Where to Buy your Supplies.
Notices of Useful Specialities from the Factory and in the Showroom.
You Can Get It At
" 0.M. Co." (Cambridge).—The disc stampings in possession marked D.S. Co., Ltd., may come from the Deritend Stamping Co., Ltd., Birmingham. Perhaps you will write to this company.
The Design of Ball-bearings.
Engineers have recognized now for some years the great advantages offered by the extended use of ballbearings. The more universal adoption of these fittings has hitherto been delayed by the somewhat high cost of various well-known types of bearings. This has been due to the fact that, if these appliances be used the material in them must be of the finest possible quality, which makes the cost comparatively high. The workmanship on these fittings has also to be extremely accurate, and the general finish should set the seal on the product. If this be not done much difficulty and expense will crop up when the bearings are in use.
The Skefko Ball Bearing Co., Ltd., Skefko Works, Luton, haa just issued a comprehensive booklet dealing,firstly with the design and general use of ballbearings, and which later goes on to give a description of the Skefko manufacturing methods and the various applications to which these fittings can be incorporated. Here will be found set out in detail the elaborate processes by means of which this company, while employing the highest class of materials and workmanship, has been enabled to place upon the market ball-hearings of various types at a reasonable cost. A clearly-written chapter on the requisite metals and requirements, together with technical reasoning and data dealing with ball-bearings, is also very apt. Our readers will do well to secure a copy of the new Skefko catalogue.
The Making of Valves.
Almost every maker of internal-combustion engines has very decided views on the material used, the machining, and the general design and finish of the valves for his designs. So thoroughly have makers gone into this question, that many of the leading concerns manufacture such parts themselves, or at least
have steel of a special brand and texture made up for their exclusive service.
. Other companies are doing an increasing and specialized business in the provision of drop forgings and stampings for valves and other cOmponent parts for the use of the engine maker. The illustration reproduced herovith 4hows a. small valve intended for service on an early 11 h.p. motorcycle engine. The larger specimen shows a valve for the largest Diesel type of internal-combustion engine made. The Hughes-Johnson Stampings, Ltd., which sends us this interesting illustration, informs us that it manufactures a full range of valves of all sizes between the largest and the smallest. This company has had long experience in the manufacture of valves, and its products are being increasingly used by many of the famous internal-combustion-engine makers.. car.
"Valves."
A New Design of Sparking Plug.
The products of the Lodge Sparking Plug Co., Ltd., are by now fairly well-known throughout the motor industry. The illustration herewith shows a new plug made by this company, which will be known as model " C." The special features distinguishing this appliance, to which readers can profitably direct their attention, are several. Firstly, the joint between the insulator and the metal parts is made of patent enamel, in preference to the asbestos generally employed for this purpose. Secondly, the use of this enamel allows a heavy centre rod—in diameter lin-to be adopted, and by this means the heat from the electrode is rapidly dissipated, so avoiding pre-ignition troubles to a large extent. The provision of a long insulating sleeve around the he.avy electrode ensures efficient insulation even, when the plug is oilsaturated. A triple spark gap, made from one piece of pure nickel, is also a very satisfactory addition.