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Fuel Economy.

28th February 1907
Page 21
Page 21, 28th February 1907 — Fuel Economy.
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Which of the following most accurately describes the problem?

The Gillett-Lehmann Carburetter Attachment.

Further to the Editorial references in our issue of the 7th instant, where a new attachment for a carburetter was mentioned under the title of " Improved carburettion," the following brief particulars should prove interesting. It will be remembered that the invention takes the form of a small addition, which can be applied to almost any existing carburetter, and that seine remarkable results in economy of fuel consumption have already been obtained, after actual.' and sustained running tests, which have been made upon. engines fitted to certain motorbuses.

The inventors, Messrs. W. Gillett and M. D. Lehmann, inform us that the separate attachments, and an improved form of carburetter with the attachment fitted into position, will shortly be put upon the market, but the makers' initial efforts will be devoted to meeting the demands for the separate apparatus. We are, unfortunately, restrained from giving any constructional details of the invention at the moment, as numerous foreign patents are now pending. The following points may, however, be mentioned. Only one air inlet is employed, and all extra inlets are blocked up, though no difficulty arises over the coupling of the device to the float-chamber and induction pipe. An extract taken from a description, which has been specially drafted for us by the inventors' patent agents, says :—" Communication, properly proportioned, is made from the floatchamber to the induction-pipe in such proximity to the throttle that the latter has the effect of giving precisely that amount of variation to the suction effort 'produced through this communication as is necessary to give a reduced suction effort on the petrol in the float-chamber." It is, put simply, a means of avoiding the sudden occurrence of excessive variations of pressure as between the surface of the petrol in the float-chamber and the induction-pipe. This has the effect of nullifying, in a large measure, the undesirable heavy discharge front the jet which takes place, normally, when the engine-speed increases, awing to the difference in • : ure between the induction-pipe and the float-chamber,

the Gillett-Lehmann device, the petrol is correctly .;7,4tf genated at all engine-speeds, and, when once fitted, the attachment never requires attention : the saving in fuel consumption through its employment has -proved, in numerous instances, to be no less than 25 per cent. These results speak for themselves, and it is unnecessary to emphasise the consequent enormous reduction in the running charges for a fleet of motorbuses which must follow upon its adoption. . One of the Important features of the invention, from an operating engineer's point of view, is that, after the initial adjustment has been made, no subsequent alteration is necessary, or, in fact, desirable, and, in all probability, some form of locking arrangement will be fitted. The inquisitive driver will, thus, be restrained from making wayside experiments. Finality in any branch of motorbus engineering does not appear to have been arrived at yet, and, although thousands of patents have been allowed for carburetters, which vary only in constructional detail, we feel that it has been reserved for Messrs. Gillett and Lehmann, to invent a valuable fitting capable of very wide use. The attachment, we believe, will be sold outright for Z.5, and this first cost is negligible in relation to the enormous saving in the quantity of fuel consumed; coupled with its undoubted reliability.

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