The Morris Paraffin Carburetting System.
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We Again Draw Attention to this Method Which, When the War Broke Out, Was Undergoing Commercial Tests of Far-reaching Nature. New Concessionnaires Now Have it in Hand.
Many of our readers will remember a device which secured considerable publicity a. year or two ago, viz., the Morris paraffin carburetter. A stage of development had been reached in 1914 which was a promising one, but since then various circumstances have arisen which have mot. enabled the apparatus to be pushed adequately on the commercial side, with the result that little has been heard of it since, but we are glad to learn that new concessionnaires have now taken the matter up ; they intend to handle the device energetically.
Little Structural Modification.
There has been little modification in the carburetter since it was last before the public, and the drawing which we reproduce will serve to remind our readers of the arrangement and design as a whole. At the present time, it is necessary for all users of petrol vehicles to consider, with renewed care, any rational suggestion that may be made to them to enable them to have an alternative te. the petrol, which, in regard to quantity, grade and price, is causing so much anxiety at the present time.
They Were Fitted to Waring's Pre-war Leylands.
It is anticipated that it will be possible under the present circumstances to fit a number of these earlouretters to machines in commercial service and to secure data and proof of their capacity to replace the ordinary petrol-consuming fitting. A noteworthy adoption which we recall in the period previous to the war was the fitting of three of Waring's aviation-type lorries with the Morris.additions, but these had to be removed promptly in order that the machines might be taken over by the Government. under the subsidy• scheme.
Our illustration has been purposely made in such a way as to leave little for us to describe in the accompanying text. It is of the carburetter itself ; in ad.thtion there is a vaporizer, which, in general form, corresponds to the heating arrangements which have been part and parcel of other paraffin-consuming fittings. It has to be noted, however, that in the Morris arrangement the coil receives an air and atomized paraffin mixture, and not pure paraffin.
The Carburetter Described.
' Turning briefly to the illustration herewith, it will be seen that the paraffin enters at the bottom of the carburetter, and, proceeding vertically upwards through an orifice, of which the area is controlled by a taper needle valve, it inter-penetrates a column of air moving at right angles to it, and this has the effect of Securing atomization. The fuel supply is controlled by a pair of float chambers carried about 14 ins, or more above the jet, there being a slight difference between the twa of them -to compensate for the relative difference between the weights of the two • fuels. The fuel therefore issues from the orifice we have mentioned finder pressure, and it will be seen that it is convenient to run either on paraffin or on petrol as occasion may demand. The air when laden with the atomized paraffin in the manner indicated is then drawn through the vaporizing device, which is part and parcel of the exhaust manifold of the engine, and returns; heated, to the body of the carburetter again. If little demand is being made, it passes up through chilled holes in the main valve, which can be seen in the middle of the illustration. When the throttle control is opened, the inner-connected air
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valve, shown on the left-hand side of the drawing, causes this main valve to lift from its seat, taking with ii the two pistons and plungers, to the lower one of which the tapered needle valve is attached. This rises, of course, at the same time and allows a larger charge of paraffin to escape into the incoming air in the lower passage. It is claimed that the compensating arrangement as between the cold-air admission and the graduated fuel supply ensures the proper mixture being achieved under all conditions.
We Hope for Convincing Tests.
We draw the attention of our readers to this device once more in the hope that it will interest them afresh in the present condition of affairs. We, ourselves, have not had an opportunity to test the device for a sufficiently long period and under adequately diverse circumstances to pass a considered judgment upon it, but the nature of the construction and previous experience in commercial use—although it has not been very extensive—is sufficient. to warrant careful examination and consideration just now. . We, therefore, welcome the renewed activity on the part of the concern which is handling this devme, and we suggest that communications are opened with the concessionnaires of the Morris carburetter, Parliament Mansions, Victoria Street, London, S.W. Fu& economy merits every chance with users