26 



THE PRODUCTION AND USE OF LIGHT 



KEROSENE OR ILLUMINATING OIL is chiefly used to furnish 

 light when burned in the ordinary kerosene lamp. It is also 

 frequently burned in stoves of special construction for heating 

 purposes. 



THE RESIDUE is manufactured into LUBRICATING OIL, 

 PARAFFIN OIL, and SOLID PARAFFIN. A small amount of COKE 

 still remains after these are removed. 



FIG. 13. The products of petroleum. 



SUGGESTION. It would be well for you to catch the different dis- 

 tillates which you obtained in Ex. 17 in small bottles, cork them air 

 tight, label each with its correct name and boiling points, then set 

 them away for future reference. Your parents and friends will 

 be glad to see samples of the crude petroleum and these products 

 (Fig. 13). 



V. PROPERTIES OF GASOLINE SOURCES OF DANGER 

 DENSITY, FLASHING POINT AND BURNING POINT 



30. The Grades of Gasoline as the Merchant Knows Them. 



We have seen that gasoline is a name applied to some of the 

 lighter, more volatile products of petroleum. We have also 

 seen that it is separated both from the lighter petroleum ether 

 and the heavier naphtha and kerosene by means of fractional 

 distillation. We have further seen that there are two grades, 

 at least, of gasoline light gasoline and heavy gasoline. When 

 you buy gasoline at the grocery store you will receive what the 

 grocer calls STOVE GASOLINE. This is the heavy gasoline. 



