The Vaporizing Of Paraffin for High-Speed Motors
(Electric Ignition Type)

38 VAPORIZING OF PARAFFIN. that shown in Fig. 23, excepting in the disposition of the spraying nozzle s, which instead of .being placed in the choke-tube b and subjected to the effect of a cross current, is in this carburettor arranged directly under the supple- mentary air inlet, and in consequence of the downwarcl flow of air this has the tendency to check an increasing aspiration of spray due to depression in the mixing chamber. The distihguishing feature, however, of the Brooke carburettor is the auxiliary nozzle s1, which is arranged to be brought into play at starting and for very slow running by a drum regulator r, which when moved to the position F, as shown, is open for a straiglit through flow to the motor : but when moved round to the position 8, communication from the throttle is completely shut-off, and the motor runs entirely on the pilot jet s1, the primary nozzle <s o wing to the low de- pression produced in the mixing chamber, then being entirely inoperative. The auxiliary nozzle is also brought into play to a varying degree, while the motor is running throttled down, and in this manner supplements the feed of the main jet ; by reason of this also, the choke- tube b can be made larger, and thus permit a freer flow of air into the mixing chamber than can be obtained in a carburettor depending on the action of a single jet. In the Solex double-jet carburettor (Fig. 33) a mixture of constant strength can be obtained in a simplified manner. Here, it will be seen, the auxiliary jet is com- bined with a small air valve to enable the Spray to be automatically shut off, as soon as the motor has speeded up beyond a predetermined limit. In this there is no supplement ary air valve used or required, and the main