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

40 VAPORIZING OF PARAFFIN. the four jets are brought into play in succession by the lifting of a floating piston carrying four thimbles, which are of such length as to uncover the nozzles at different degrees of throttle opening. A still further refinement of action is produced in the Frier and Martin multiple- jet carburettor, by the use of three or more independent choke-tubes, each separately controlled by a hand- operated slide-valve corinected to a throttle piston, a movement of which brings into action the series of jets progressively ; in this example, however, the supply of air is corrected for varying speeds of the motor by an automatic valve, and for this reason, strictly speaking, belongs to a class apart from all others. There is now, however, an increasing tendency to avoid the use of any form of jet or air ad just ment de- pending on automatic action, o wing partly to wear and leakage of the regulating device, but more to inconstancy of action resulting from the sticking fast or interference in the free movement of any form of automatic regulator, due to solid particles carried in with the air when travel- ling over dusty roads, for which reason as dust and finely attriturated grit is alike pernicious to the pistons and cylinders, it would be a great impro vement and conduce to a much longer life, if an efficient filter were fitted to all road-car motors, especially as this can be done without materially interfering with the action of the carburettor. An obvious remedy for the dust met with in many districts in dry seasons consists in the use of an arrester, made to operate either on the cyclone principle, or by causing all the air entering the carburettor to circulate down through a large filter box containing a series of fine gauze travs ; the amount of dust that can be collected