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

WITH COMPRESSED-AIR ATOMIZERS. 45' compete with simpler methods, such as the direct induc- tion paraffin carburettor type, and a number of others of the explosion heated type réquirmg also to be lamp- heated at starting, which are in great variety for industrial fixed and portable oil engines, and described at consider- able length in Carburettors, Vaporizer#, Vedves, etc. The efficiency of a compressed-air jet in atomizing heavy oils has been proved to be higher than any ot her methocl in large power direct injection engines, and it would seem now that petrol has advanced in price that this system miglit have possibilities in connection with high-speecl engines of the exhaust-heated vaporizer type,, in adapting these to run more efficiently on the cheaper grades of flash-proof non-tax oils, known as kerozene,. paraffin, and as lamp oil; especially for purposes where perfeet combustion with a clear exhaust, so difficult to obtain under variable speed and power conclitions, is most desirable. As will be seen, however, there are difficulties in applying this system on a comparatively small scale as required for road-car motors ; yet as other systems quite as complex have been trieel, in the endeavour to solve this very elusive problem, a study of this pioneer system will not be without interest. Referring, there- fore, to the sectional diagram (Fig. 36). illustrating its application to a stationary engine of the slow-running single- or double-cylinder type, and suitable for powers ranging from 5 to 30 H.P. or so, we find the essential features to consist of an exhaust jacketed chamber v,. a spraying nozzle z, and a pressure oil tank /. The atomizer is fitted at the remote end of the vaporizer— i.e., away from the motor cylinder—and is usually supplied with paraffin and air under a pressure of 8 to