The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . Fig. 9.—Perfume Spray Producer. heavy petroleum oil to the full extent possible from the vapourtension of the oil at that particular temperature. The oilengines described below are in reality explosion gas engines ofthe ordinary Otto type, with special arrangements to enablethem to vaporize the oil to be used. Only such parts of themas are necessary for the treatment and ignition will thereforebe described. Fig. 10 is a vertical section through the cylinder and vaporizerof a Priestman engine, and
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . Fig. 9.—Perfume Spray Producer. heavy petroleum oil to the full extent possible from the vapourtension of the oil at that particular temperature. The oilengines described below are in reality explosion gas engines ofthe ordinary Otto type, with special arrangements to enablethem to vaporize the oil to be used. Only such parts of themas are necessary for the treatment and ignition will thereforebe described. Fig. 10 is a vertical section through the cylinder and vaporizerof a Priestman engine, and fig. n is a section on a larger scale,showing the vaporizing jet and the air admission and regulation valve. Fig. 10.—Priestman Oil Engine (vertical section through cylinderand vaporizer). leading to the vaporizer. Oil is forced by means of air pressure froma reservoir through a pipe to the spraying nozzle a, and air passesfrom an air-pump by way of the annular channel b into the sprayer c,and there meets the oil jet issuing] from a. The oil is thus brokrnup into spray, and the air charged with spray flows into the vaporizerE, which is heated up in the first place on starting the engine bymeans of a lamp. In the vaporizer the oil spray becomes oil vapour,saturating the air within the hot walls. On the out-charging strokeof the piston the mixture passes by way of the inlet valve H into thecylinder, air flowing into the vaporizer to replace it through thevalve I (fig. 11). The cylinder K is thus charged with a mixture ofair and hydrocarbon vapour, some of which may exist in the form ofvery fine spray. The piston L then returns and compresses themixture, and when the compression is quite comp
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