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

58 CHAPTER IV. METHODS OF VAPORIZATION IN THE HIGH- SPEED MARINE ENGINE (ELECTRIC IGNITION). The progression of the larger powered oil engines for marine propulsion is in some measure away from the carburetion method used in petrol motors, and has resulted in the clevelopment of three types: (I) The Diesel, in which the compression is so high that when the fuel is injected in the dynamically heated air. it ignites immediately ; (2) the hot-bulb or cylinder vaporizer type of oil engine working on a modified principle, in which the heat required for vaporization of the fuel injected is in part derived from the walls of an unjacketed extension to the combustion chamber ; and (3) that type of cil engine characterized as high-speed with electric ignition, in which the fuel is sprayed into air in a form of carburettor and the mixture drawn through either a flame-, electrically-, or exhaust-heated vaporizer. This latter type of oil engine, known as the paraffin vaporizer motor, is peculiarly adapted for motor-boats, laimches. as auxiliary power for yachts, also for ships’ auxiliaries, despatch boats, etc., and has been used for submarine and torpedo boats of the smaller sizes. The paraffin vaporizer motor has many of the advan- tages of the petrol, in that it lends itself for instant