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

VAPORIZATION IN THE HIGH-SPEED MARINE ENGINE. 61 atomizing air, as also used in the Westmacott vaporizer (vide Fig. 65), the Ivel-Boswell tractor paraffin motor,, and others, affords considerable heating surface, and has the advantage of splitting up the mixture and bringing every particle into close contact with the vaporizing surface of the tubes. In this vaporizer the mixture,, after being drawn through the nest of tubes v1, passes along portways v2 to the annulus suirounding the con-divergent mixing nozzle c, through which the main air supply enters from a, being regulated in volume by the pulsator cd, which. when the motor is running slow, remains close up to the contracted neck, thus restricting the flow. Two feed supply cisterns t are used, one for petrol and the other for paraffin ; pipes f connect these- to the main supply tanks, either placed at a higher level, or if this is inconvenient, arranged for a sufficient air pres- sure to force the fuel past the float valves. A two-way plug k with handle k1, Controls communication from either supply to the atomizing regulator valve r1, made hollow as in Figs. 37 to 40, to admit a stream of atomizing air along the passage z1 and through the three-way plug z,. whence either air can be drawn direct from z2, or inert gas through the passage z3, or again a blend of each. The feed regulator r1 is finely threaded to screw with a minimum of lost motion in the neck of the seating, but so that there shall be no slack, a stiff spring is fitted under the handle r, as in Figs. 37 to 40, thus the least adjustment of the pointer round the index dial in either direction directly affects the feed ; this, in these vaporizers, is an exceedingly fine annular jet, not more than 0’008 inch in thickness, which is, therefore. easily broken up by the centrally contracted air stream : induced in part by