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

4 VAPORIZING OF PARAFFIN. falling-off in the output, despite the increased production of motor spirit, which has made it necessary by partial dissociation to eneroach on a considerable proportion of the distillate previously included in the paraffin grades. Paraffin, again, has escapecl the tax-gatherer, and for this and other reasons its cost is never more than one-half, and is now less than one-third that of petrol. As an off-set to this, however, and despite all the modern refinements of modern processes, paraffin is not only com- paratively pungent, but difficult of carburetion, so as to run a high-speed motor under variable conditions of load and speed with a clear exhaust, this difficulty being in inverse ratio to the size and speed of the motor, and as a natural consequence of this the successful application of paraffin to motors of the automobile type has been held back to a considerable extent. But owing to the in- creasing cost of petrol renewed efforts have been, and still continue to be, made by engineers to evolve a really successful high-speed paraffin motor especially adapted for the very trying conditions met with in the running of road cars, motor boats, and for other purposes served so successfully by the petrol motor. As explained, either an exhaust- or lamp - heated vaporizer, or its equivalent, is necessary for the success- ful use of flash-proof oils ; such may either take the form of a combined vaporizer and carburettor, or be con- nected up to an ordinary petrol carburettor as a separate fitting. For road-car motors and tractors which usually have to run with a high jacket temperature of 180° to 200° Fahr.. and under more widely varying load and speed conditions than required for marine or stationary work, either the combined carburettor and vaporizer