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

VAPORIZATION IN THE HIGH-SPEED MARINE ENGINE. 63 by means of tlie two-way plug t. The vaporized mixture receives a supplementary supply of air through the ported sleeve valve a1, and is thence admitted to the motor cylinders past tlie usual throttle /?, by way of the pipe n. Petrol-started paraffin motors with this form of vaporizer have been fitted in submarine boats, capable of developing up to 350 such motors having two sets of four 12-inch by 8-inch stroke cylinders, each set having its own vaporizer, and each cylinder a separate water injection valve to subdue explosive violence when running fully opened out. In another form of exhaust-heated vaporizer for sub- marine engines using flash-proof oils of the paraffin series, illustrated in Figs. 43 and 44, and known as the Koerting, there is no petrol used for starting, and as, obviously, in an application of this nature, the use of burners is quite unsuitable, eitlier some form of mechanical atomizer working under high pressure in conjunction with a high ■compression, or an electric heater must be adopted ; in place of either of the methods first named, therefore, an adaptation of the latter method is used, and is the most interesting feature of this vaporizer ; this consists of a chamber s through which a series of wire resistances r, •carried by insulators at both ends, are first placed in ■Circuit for a few minutes with the accumulator cells used for supplying current for propelling the boat when submerged, the motor meanwhile being slowly moved round by the electric motor, and when by this means both vaporizer and motor cylinders have attained to the necessary temperature, the oil feed and ignition current are switched on. Air is drawn into the stove at ■a, and during its passage in contact with the heated