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

ROAD CAR AND TRACTOR MOTORS. 95 flange, which, when the bonnet is in its lowest position, as shown, closes against the upper edge of the opening in the base of the regulator ring r. Immediately following the opening of the mixture supply throttle h, the bonnet t is drawn up to a varying height, varying according to the speed of the motor, and in so doing causes the air-way to be increased in a greater ratio than the lift, and by this means compensates for the increasing thickness of the fuel jets caused by the movement upward of the two taper needles. The outer sliding bonnet t is guided by a fixed cap b, which is drilled with a series of holes around its base for the purpose of admitting air to the inside of the inner fixed guide b, which acts as a choke-tube , all supplement ary air is stopped off when the flange regulator of the outer bonnet is in its lowest position, as when running slow with the throttle-plug li at nearly right angles. The two fuel-jet needles are adjusted so that when the outer bonnet is at its lowest position which then rests on a shoulder of the inner fixed guide b—the needle con- trolling the petrol feed is raisccl in its nozzle sliglitly in advance of the other needle controlling the paraffin feed, so that when running dead slow petrol only will be admitted. It will be understood that with. the lifting of the regulator flange, constituting in conjunction with the curved ring r the supplementary air valve, both jets are brought in to action, the proportion of one to the other varying according to the speed of the motor and to relative adjustment of the two needles. A further correc- tion in the strength of the mixture for varying speeds and degrees of throttle opening can be efteeted by sub- stituting for the ring r another having a slightly steeper