A Promising Jetless Carburetter
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Simplicity, Good Vaporiz a lion and Automatic Mixing Control Among Leading Features
A NEW carburetter employing an inrt. teresting principle has recently been introduced by the Patent Development Trust, Ltd., Gaywood House, Wood Street, Westminster, London, S.W.I. Known as the Anderson, it is simple in design and, consequently, cheap to produce, whilst the claims made for its efficiency would appear to be justified by a study of its principles of operation. These should ensure that the petrol is thoroughly atomized and mixed with the incoming stream of air, thus promoting good vaporization and complete combustion.
The construction and operation of the device will be understood from the following description read in conjunction with the accompanying sketch :— From the float chamber (A) the petrol passes a needle valve of special design (C), which is controllable by an arm (N) to allow for easy starting and running until the engine attains its working temperature. As petrol emerges 1324 from the valve it is met by a jet of air (B) which breaks it up. The over-rich mixture thus formed then passes to an annular space formed inside the narrowest portion of the choke tube (II, and thence is admitted to the main air stream (F), through a 'narrow annular slot (K), emerging into the choke in the form of an exceedingly thin film.
In the choke is a movable cone (D), the position of which is dependent on the suction of the engine. Thus, at low speeds the main air stream travels at a comparatively high velocity, being restricted in sectional area to a narrow ring, and meets the fuel mixture over the greatest possible area. By this means the mixture is delivered to the induction pipe in a state which approaches the ideal At higher speeds the cone is drawn out of the way.
The system of injecting the petrol into the air stream maintains a mixture claimed to be in accordance with the needs of the engine at all speeds and throttle openings, for at high r.p.m., when the load on the engine is comparatively light, the mixture is relatively weaker than when the engine is pulling hard and running slowly. Special provision is made for starting and idling, as shown at E on the drawing. Should any dirt obstruct the needle valve, it is only necessary to operate the control on the dash to clean it. We understand that the Anderson carburetter can be adapted to any make of petrol engine without more than slight alteration.