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The Purchase Department.

6th April 1916, Page 21
6th April 1916
Page 21
Page 21, 6th April 1916 — The Purchase Department.
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Where to Buy your Supplies.

Shrewsbury and Challiner Tires.

The Shrewsbury And Challiner Tyre Co., Ltd., Arch wick Green, Manchester, has sent to us a copy of an abridged list which shows the sizes and prices of the solid baud tires which this concern is at present manufacturing. The list applies from 1st March. The tables which are included are set out showing the standard engineering sizes. A number of tire sizes which are not standard is also listed and we understand that they can still be supplied.

Barimar Extensions.

Barimar, Ltd., 10, Poland Street, Oxford Street, London, W., advises us that it has recently taken over an additional factory in order to be in a position to cope with its rapidly expanding business. We understand that the concern is now in a position to accept orders for quick delivery for acetylene repairs, automobile and aero sheet metal work, the manufacture of new radiators, whilst it can also carry out repairs expeditiously to damaged radiators and lamps. Precedence will, of course, be given to orders which may be directly or otherwise concerned with Admiralty or War Office contracts.

A Handbook on the Ford.

We have recently received a copy of an interesting handbook from Morris, Russell and Co., Ltd., 75, Curtain Road, London, E.G.. which deals fully with the construction, operation and repair of the model T Ford vehicle. Of course, the maker of the Ford issues an instruction book, but it is necessarily brief, as there is no opportunity for an extended exposition of the principles of working. The book is divided into five chapters, which are made up as follow :—" The Ford Vehicle--Its Parts and Other Functions," "The Engine and Auxiliary Groups," "Details of the Ford Chassis Parts," "Driving and Maintenance," "Overhauling and Repairing Mechanism." Although dealing with the Ford vehicle in the main, reference is made on several occasions to the general working principles of the internal-combustion engine and the other parts which go to make up a complete chassis.

A number of original photographs, which have been specially taken, together with many clean line drawings, are included, which help to make the subject matter easy to understand even to the non-mechanical mind. The boa will also be found very useful in garage and repair sheers. It can be obtained from the company at the above address at the price of 4s. 6c1., post free.

The Heco Magneto—An American Production.

We have received particulars of an interesting magneto of American manufacture, which is being marketed in this country by Abingdon-Ecco, Ltd.,. Tyseley, Birmingham. The feature which makes itself apparent to anyone who for the first time sees the Heco magneto, is its unusual form. As compared with the majority of h.t. magnetos, as recently marketed, this new accessory possesses a number of distinctive features in form and construction, which, it is claimed, have not been embodied merely to gi-ve novel appearance, but to afford, so far as possible, increased efficiency.

The outstanding feature of the Heco is undoubtedly

its characteristic of roundness. The magnets are round, the armature. windings are round and have a round iron core, whilst the condenser is also of the same shape. By the use of round magnets, it is possible to fasten them to the pole pieces of the field by boring and reaming round holes in the fields into which the magnets, after being carefully ground, are pressed. This utilizes the whole of the surface at the ends of the magnets, and therefore gives the largest possible cont act surface.

The round armature is a feature of the Heco accessory. Its construction permits of the shortest lengths of wire in both the primary and secondary winding to be utilized-. The armature windings are assembled about a round iron core, which is made up of a number of very small and correspondingly well-annealed, soft iron wires. The condenser is round, which makes possible a larger nderofarad capacity than is usually attainable in other shapes, thus permitting the use of less resistance in the primary winding and at the same time it eliminates sparking at the contact points.

It is claimed that the Heco high-tension magneto produces a spark of extreme intensity, the magneto generating its own high-tension currents directly in the armature winding. Two ignition sparks are produced during each revolution of the armature, except in two of the nine types of magneto which are made. The armature shaft is fitted with ball bearings at both ends. Two oil cups are provided, one at each end of the magneto. The makers state the Heco accessory produces its spark with absolute accuracy at the determined point of the stroke. This fact, together with the extreme intensity of the spark which is produced, makes it possible to operate the, magneto with much less advance than is required with some other ignition systems. The arrangement for varying the timing of the ignition permits a range of 35 degrees. A leaflet describing the constructiona,1 .details of this magneto can be obtained upon application.

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