A NEW ZENITH CARBURETTER.
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A Resume of Recently Published Patents.
An improved type of Zenith carburetter is described this week in specification No. 153280 by Societe du Carbuletteur Zenith. The neteentors commence by pointing out that one of the essential objects to be aimed at in designing a carburetter is a maximum depression about the jet, with a minimum depression in the induction pipe. In other words, what isrequired is that, there should be as effective ea suctien as, can be obtained on the jet, while the vacuum in the induction pipe should be as little as possible. The former is necessary of order to enable the requisite quaeitity of petrol to be drawn out of the jet and thoroughly sprayed, while the latter is advantageous, inasmuch as the nearei the pressure in the induction pipe is to atmospheric, the more nearly is the cylinder filled with explosive mixture at the end of the induction stroke. They point out that the ordinary venturi tube effects this object to a certain degree, since, with the jet properly disposed in the choke, there is increased suction there for a given depression in the induction pipe itself. They remind us that in former patents two venturi tubes have been used in order to increase this effect.
la the present design there is a combination of venturi tubes, which maybe considered as being a triple venturi tube of a. particular kind. As the result of this arrangement, the depression at the jet is still more strongly increased, and the spraying of the petrol considerably enhanced without calling for a correspondingly increased vacuum in the induction pipe.
As may be noted by reference to the accompanying illustration, the main body of:the carburetter is constructed on the familiar • Zenith principles in that it embodies a submerged compensation jet, a main jet at about. the level of the petrol in the float chamber, and an aspirator tube and slow-running jet of the usual type, all of them being conveniently arranged so that they aro accessible for adjustment or for any other purpose.
The main fuel supply leaves the body elite between this SrmulaT passage and enters an annular passage round a diminutive choke tube. Holes communicate between this annular passage and the interior of the tube, which may be termed the first or innermost of the three venturi tubes. It emerges in the throat of the second and slightly larger venturi tube, which is supported from it SG that the two are integral. The upper end of the second tube opens into the throat of the main venturi.
A Tractor Hitch.
H. Ferguson's method of attaching is self-lift plough to a tractor is described in specification No. 160,248. The inventor claims that with this particular hitch, which consists in. the main of a pair of links, one of which is adjustable and both of which can swivel about a vertical pin or pins attached to the tractor, has the advantage that it enables a close hitch between tractor and implement to be effeeted, whilst main, tabling the most favourable line of draft close to the ground, without at-the same time reducing the normal clearance space
B38 between hitch and ground. The effect is to transfer some of the weight of the tractor to the plough, thus holding it more firmly into its work than is possible with the ordinary type of hitch, and at the same time reducing slightly the ground compression caused by the tractor wheels In the drawing which accompanies the pecificaticn, the plough is shown hitched
to a tractor, which is either a Fordson, or one very similar to it. A special abutment is fitted to the rear of the axe case at a convenient aistance above the main draw-bar plate. Holes drilled in these two brackets accommodate a pair of pins about which swivels a ‘ertical plate or wing. A pair of links hitched near the bottom end of this plate are secured at their rearward end to the plough frame. Another pair hitched to thiii plate 'near its upper end are attached, through the medium of a nut and screw, to brackets which project above the plough frame, but which actually form an extension of that-frame. There is a third link, which is jointed. It is controlled by a hand lever wOrking over a suitable quadrant, and, by straightening or bending it at the joint, file plough is lifted from or lowered into its work. Provision is made in this articulated link for lateral adjustment of the nlough to the respective tractor.
Other Patents of Interest.
An interesting arrangement of land roller for use with a tractor is described iii specification No. 160,350 by R. Maynard. There are three rollers; the main one is of about the average width and is attached' to the tractor in the usual manner by means of a draw-bar; there are two subsidiary rollers of about half the width of the other; they are attached to that other by means of a pair of links, of which one is detachable and the other may swing either out from the end of the main roller or over towards the middle of it. The detachable link is utilized to maintain the other in either of its two extreme. positions. When working, the links are swung to the outer position, in which case the small rollers are trailed behind the large, but beyond it to right and lefta thus making the effective length equal to the sum of
that of the three rollers. When not actually in use, the free links are swung inwardly, so that the small rollers track behind the large one. They may then conveniently be taken through ordinary gateways or along ordinary field paths without trouble.
In view of the discussions which have taken place in our editorial columns with respect to the necessity for fitting a swag to a commercial motor vehicle, particular interest attached to specification No. 137,545 by 'W. Pfleeger, He fit, either an the rear axle or the propeller shaft, a special ratchet, and, in proximity to it, a double-ended pawl, which, in normal circumstances, is restrained in its mid position by a spring. He controls this pawl by means of a hand lever, and it may be set so as to prevent the vehicle running downhill, whether it be facing up or down the incline.
A. Sturch, in order to eliminate the noise and rattle whick seemingly, is in-. separable from brake and steering connections of the jaw and eye type, fits these components with non-metallic flanged bushes, thus preventing metallic contact. His specification is numbered 160,345.
An ingenious snap terminal for sparking plugs is described in Nom 160,375 by N. L. Williams.
A motor cultivator of peculiar type ha, reference in No. 146,271 by W. Nachtigall. It is a vertical rotary implement, and the small ploughs' which are used are constrained by means of a cam to turn over the soil dnring onehalf of a revolution of the cultivator and to harrow it for remainder.